State Route 588 (SR 588) is an east–west state highway in the southeastern portion of the U.S. state of Ohio. The western terminus of SR 588 is at SR 325 in Rio Grande. Its eastern terminus is at a signalized intersection with SR 7 in downtown Gallipolis.

Ohio State Route 669J

Ohio State Route 635

Ohio State Route 585

State Route 672 (SR 672) is a 3.11-mile-long (5.01 km) east–west state highway in the southeastern part of the U.S. state of Ohio. The highway runs from its western terminus at a Y-intersection with SR 146 nearly 1.75 miles (2.82 km) northeast of Cumberland to its eastern terminus at a T-intersection with SR 821 about 3 miles (4.8 km) southwest of the village of Pleasant City.

State Route 66 (SR 66) is a north–south state highway in the northwestern portion of the U.S. state of Ohio. Its southern terminus is at U.S. Route 36 (US 36) in Piqua, and its northern terminus is at US 20 in Fayette. South of Defiance it generally follows the route of the former Miami and Erie Canal.

Ohio State Route 578

State Route 719 (SR 719) is a very short east–west state highway located in central Ohio, a U.S. state. Situated within the southernmost sections of the city of Zanesville as well as parts of South Zanesville and Springfield Township, SR 719 is a four-lane undivided route whose primary purpose is to connect the concurrency of US 22 and SR 93 (Maysville Avenue) at its western end with SR 555 at its eastern end, which, in turn, meets SR 60 just across the Muskingum River from SR 719's eastern terminus.

Ohio State Route 628

State Route 705 (SR 705) is a state highway in western Ohio, a U.S. state. The highway's western terminus is in rural northwestern Darke County at SR 49 approximately 5.25 miles (8.45 km) southeast of Fort Recovery, and just a mile south of the Darke-Mercer County Line. Its eastern terminus is at SR 29 nearly 2.75 miles (4.43 km) northwest of Sidney. Established in the late 1930s, SR 705 connects the northern half of Darke County to the city of Sidney. The highway goes through rural areas in Darke County, passing through the villages of New Weston and Osgood heading east. The road follows very close to the Mercer County Line throughout Darke County. In Shelby County, Fort Loramie is the only village along the road.

Ohio State Route 706

State Route 669 (SR 669) is an east–west state highway in Perry and Morgan Counties in the US state of Ohio. The western terminus of SR 669 is at an intersection with SR 13, southeast of Somerset. The eastern terminus of SR 669 at an intersection with SR 37 and SR 78. Most of the route is a rural two-lane highway and passes through woodland, farmland, and residential properties. For some of its path, SR 669 runs generally parallel to the west of Muskingum River.

State Route 697 (SR 697, OH 697) is an east–west state highway in the western portion of Ohio, a U.S. state. The western terminus of State Route 697 is located at its junction with State Route 116 approximately 2 miles (3.2 km) southwest of Middle Point. The eastern terminus of this route is located on the northern fringe of downtown Delphos, following a nearly 0.25 miles (0.40 km) concurrency with State Route 66 at a signalized intersection that doubles as the southern terminus of State Route 190.

State Route 664 (SR 664) is a north–south state highway in the southern portion of the U.S. state of Ohio. The highway has its southern terminus at a T-intersection with SR 56 in the unincorporated community of South Bloomingville. The northern terminus of SR 664 is also at a T-intersection, this time with SR 256 on the Fairfield–Perry county line approximately 4.75 miles (7.64 km) north of the village of Rushville.

State Route 728 (SR 728) is a short east–west state highway situated in south-central Ohio. At a length of just under 2 miles (3.2 km), the state highway is a spur route that provides access to the Southern Ohio Correctional Facility. The western terminus of SR 728 is at a signalized intersection with U.S. Route 23 (US 23) in Lucasville that doubles as the eastern terminus of SR 348. Its eastern terminus is just east of the Southern Ohio Correctional Facility, at the intersection of Lucasville-Minford Road (Scioto County Road 28 or CR 28) and Lang Lane (CR 180).

Ohio State Route 656

Ohio State Route 59 (1923)

State Route 662 (SR 662, OH 662) is a north–south state highway in the central part of Ohio, a U.S. state. The southern terminus of the route is at a T-intersection with State Route 209 nearly 5.50 miles (8.85 km) northwest of the city of Cambridge. Its northern terminus is also at a T-intersection, this time with State Route 93 approximately 3.50 miles (5.63 km) south of the village of Plainfield.

Ohio State Route 60

In Ohio, State Route 62 may refer to:
* U.S. Route 62 in Ohio, the only Ohio highway numbered 62 since about 1932
* Ohio State Route 62 (1923), now SR 19

Ohio State Route 600

Ohio State Route 727

Ohio State Route 6 (1923)

State Route 72 (SR 72) is a north–south state highway in the U.S. state of Ohio. Its southern terminus is at US 62 near Highland, and its northern terminus is at SR 334 just north of Springfield. As it travels through Springfield, Ohio, it is known as Limestone Street.

In Ohio, State Route 670 may refer to:
* Interstate 670 in Ohio, the only Ohio highway numbered 670 since about 1974
* Ohio State Route 670 (1930s-1970s), now SR 761 and part of SR 313

Ohio State Route 698 (OH 698) is a north–south state route in northwestern Ohio. Its southern terminus is at OH 103 near Jenera, and its northern terminus is at Hancock County Road 313 (formerly US 25), which is parallel to I-75, about 5 miles (8.0 km) southwest of Findlay.

Ohio State Route 665

State Route 605 (SR 605) is a 9.38-mile-long (15.10 km) north–south state highway in central Ohio. The southern terminus of SR 605 is at a signalized intersection with U.S. Route 62 (US 62) in the northeastern Columbus suburb of New Albany. Its northern terminus is also at SR 37, a signalized intersection approximately 3 miles (4.8 km) southeast of Sunbury. The route was designated in 1937, and the northern terminus was moved in 1994.

State Route 694 (SR 694) is a 12-mile-long (19 km) state route that runs between the Auglaize River and Glandorf in the U.S. state of Ohio. Most of the route is a rural two-lane highway and passes through farmland properties. SR 694 was first signed in 1937 on much the same alignment as today. The highway was paved in 1950.

Ohio State Route 621

Ohio State Route 715

Ohio State Route 686

State Route 656 (SR 656) is a state highway in the central portion of the U.S. state of Ohio. The highway's southern terminus is at SR 61 approximately 4.5 miles (7.2 km) north of Sunbury. It travels northeast to its junction with SR 229, less than 0.25 miles (0.40 km) northeast of the village limits of Sparta.

State Route 676 (SR 676) is a 26.53-mile (42.70 km) long east–west state highway in the southeastern portion of the U.S. state of Ohio. The western terminus of SR 676 is at a T-intersection with SR 555 approximately 3 miles (4.8 km) southeast of the village of Chesterhill. Its eastern terminus is at a T-intersection with SR 7 in the southwestern portion of the city of Marietta.

State Route 625 (SR 625) is a state route in northeastern Ohio that exists entirely within Mahoning County. The southern terminus of SR 625 is at U.S. Route 224 (US 224) near Boardman, and its northern terminus is at US 62 in the southwestern portion of Youngstown. SR 625 is currently signed north–south, but in the past was signed east–west.

Ohio State Route 576

In Ohio, State Route 675 may refer to:
* Interstate 675 in Ohio, the only Ohio highway numbered 675 since about 1962
* Ohio State Route 675 (1930s-1960s), now SR 685

State Route 668 (SR 668) is a north-south state highway in central Ohio. Its southern terminus is at an intersection with SR 93 in the Wayne National Forest, northeast of Logan; its northern terminus is at an intersection with US 40 in the unincorporated community of Brownsville.

Ohio State Route 698

Ohio State Route 580

State Route 598 (SR 598) is a 23.43-mile-long (37.71 km) north–south state highway in the northern portion of the U.S. state of Ohio. The southern terminus of SR 598 is at a signalized intersection where it meets SR 19, SR 61 and SR 309 in Galion. Its northern terminus is at SR 103 nearly 1.75 miles (2.82 km) east of Willard.

State Route 601 (SR 601) is a north–south state highway in North Central Ohio. A two-lane eastern bypass of Norwalk, SR 601 has its southern terminus at SR 18 southeast of Norwalk, adjacent to Summit Motorsports Park. The northern terminus of SR 601 is at SR 113 in downtown Milan, less than one-quarter mile (0.40 km) east of the junction of SR 113 and the U.S. Route 250 (US 250)/SR 13 concurrency.

Ohio State Route 680 (1930s-1960s)

Ohio State Route 658

Ohio State Route 675 (1930s-1960s)

State Route 727 (SR 727) is a north–south state highway located in the southwestern portion of the U.S. state of Ohio. SR 727 has its southern terminus at a T-intersection with SR 131 approximately 1.50 miles (2.41 km) west of Newtonsville. The highway's northern terminus is at a T-intersection with SR 133 nearly 5.25 miles (8.45 km) southwest of Blanchester in the unincorporated community of Edenton. The route provides access to Stonelick State Park.

State Route 586 (SR 586) is a north–south state highway located in the central portion of the U.S. state of Ohio. The highway's southern terminus is at a T-intersection with SR 146 in the unincorporated community of Nashport. The highway's northern terminus is at a Y-intersection with SR 13 in Mount Vernon.

State Route 701 (SR 701, OH 701) is a 8.96-mile (14.42 km) east–west state highway in western Ohio, a U.S. state. The state highway's western terminus is at a T-intersection with SR 309 nearly 3 miles (4.8 km) southeast of Ada. The eastern terminus of State Route 701 is at U.S. Route 68 (US 68) approximately 3.50 miles (5.63 km) southeast of Dunkirk. Established in the late 1930s, SR 701 is a two-lane route that serves as an eastward continuation of SR 309, which runs due east out of Lima. SR 701 picks up along the same east–west alignment when SR 309 turns southeasterly in the direction of Kenton.

State Route 61 (SR 61) is a north–south state highway in the northern portion of the U.S. state of Ohio. Its southern terminus is at the U.S. Route 36/State Route 3 concurrency in Sunbury, and its northern terminus is at U.S. Route 6 east of Huron, at the southernmost point of Lake Erie (which is subsequently the southernmost northern border of the United States). State Route 61 is routed through the communities of Mount Gilead, Galion, Crestline, Shelby, Plymouth, Norwalk, and Berlin Heights.

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State Route 665 (SR 665) is an east–west state highway located in central Ohio, a U.S. state. The western terminus of this state highway is at a signalized intersection that marks the confluence of US 42, SR 38, SR 56 and SR 142 in downtown London. Its eastern terminus is at an intersection with US 23 and SR 317 approximately 2.50 miles (4.02 km) northwest of the village of Lockbourne.

Ohio State Route 65

Ohio State Route 670

State Route 721 (SR 721) is a north–south state highway located in the western portion of the U.S. state of Ohio. The southern terminus of SR 721 is at a T-intersection with SR 49 approximately 2.75 miles (4.43 km) south of the village of Potsdam. Its northern terminus is also at a T-intersection, this time with SR 185 on the Darke–Miami County Line nearly 1.50 miles (2.41 km) north of Bradford.

Ohio State Route 651

Ohio State Route 663

Ohio State Route 722

State Route 644 (SR 644) is a north–south state highway running through Columbiana and Carroll counties in northeast Ohio. Its southern terminus is at SR 39 in downtown Salineville, and its northern terminus is at its junction with U.S. Route 30(US 30) and SR 9 in the center of Kensington. The route connects mainly rural and a few unincorporated parts of southeastern Columbiana County. SR 644 only briefly passes into a corner of Carroll County for a 0.41-mile (0.66 km) journey.

Ohio State Route 711

Ohio State Route 623

Ohio State Route 605

State Route 684 (SR 684) is a short north–south state highway in the southern portion of Ohio. Its southern terminus is at State Route 143 in the unincorporated community of Harrisonville, and its northern terminus is at State Route 681 near the community of . Created in the late 1930s, State Route 684 is entirely contained within Scipio Township in Meigs County. The two-lane highway, in conjunction with the former State Route 692, provides a cutoff route for traffic running between Pomeroy and Albany via State Route 143 and State Route 681.

Ohio State Highway 725

State Route 710 (SR 710) is a 4.06-mile-long (6.53 km) state highway in the central portion of the U.S. state of Ohio. Existing entirely within the northern portion of the city of Columbus, SR 710 begins at an intersection with SR 161, less than one-quarter mile (0.40 km) west of exit 117 off Interstate 71 (I-71). The highway ends at a seven-ramp partial cloverleaf interchange with I-270 at its exit 27.

Ohio State Route 670 (1930s-1960s)

Ohio State Route 71 (disambiguation)

Ohio State Route 607 (SR 607) was a north–south state highway in the southern portion of the U.S. state of Ohio. Its southern terminus was on the East Huntington Bridge over the Ohio River at the West Virginia state line near Proctorville where West Virginia Route 106 continues south. SR 607's northern terminus was at SR 7 and SR 243 west of Proctorville.

State Route 585 (SR 585) is a north–south (physically northeast-southwest) state highway in the northeastern portion of the U.S. state of Ohio. The southern terminus of State Route 585 is at the SR 3/SR 83 concurrency in Wooster. The northern terminus of this state route is an interchange with SR 21 in Norton, where Wooster Road then continues to the northeast into Barberton.

State Route 64 (SR 64) is a 36.44-mile (58.64 km) long north–south state highway in the northwestern portion of the U.S. state of Ohio. The southern terminus of SR 64 is at an interchange with Interstate 75 (I-75) in Bowling Green which also doubles as the western terminus of SR 105. Its northern terminus is at the Michigan state line just 0.25 miles (0.40 km) north of the village limits of Metamora. Continuing north into Michigan's Lenawee County is county-maintained Loar Highway.

State Route 634 (SR 634) is a 17.95-mile-long (28.89 km) state highway in the northwestern portion of the U.S. state of Ohio. The highway runs from its southern terminus at its junction with SR 189 and SR 190 in Fort Jennings to its northern terminus at the intersection of SR 15 nearly 1.5 miles (2.4 km) north of Continental. SR 634 runs entirely within Putnam County and is entirely a two-lane highway. SR 634 was commissioned in the late 1930s, the northern terminus was in Defiance County. Some of the highway was paved when it was commissioned. The last section to be paved was in the early 1950s. The northern terminus was moved to its current location in the late 1960s.

State Route 616 (SR 616) is a north–south state highway in the northeastern portion of the U.S. state of Ohio. The southern terminus of SR 616 is at a signalized intersection with SR 170 immediately south of US 224 in Poland. The northern terminus of the state highway is at a signalized intersection that doubles as the eastern end of the concurrency of US 62, SR 7 and SR 304 in Hubbard.

State Route 652 (SR 652) is a north–south unsigned state highway in the southern portion of Ohio. Its southern terminus is on the Ben Williamson Memorial Bridge and Simeon Willis Memorial Bridge on the Ohio River near Coal Grove, and it runs 0.31 miles (0.50 km) to U.S. Route 52 (US 52).

State Route 578 (SR 578) was a short north–south state highway in northwestern Ohio, a U.S. state. SR 578 ranked among the shortest state routes in the state, coming in at a length of just 0.19 miles (0.31 km). Its southern terminus was at SR 65 in Grand Rapids, and its northern terminus was at what was then U.S. Route 24 (US 24), just across the Maumee River and the Wood-Lucas county line from Grand Rapids. After SR 295 was extended from its southern terminus along the Maumee River and the former route of US 24, it took over all of SR 578 in 2012 thereby deleting the SR 578 designation.

Ohio State Route 61 (1923)

Ohio State Route 669C

Ohio State Route 689

State Route 726 (SR 726) is a north–south state highway in western Ohio, a U.S. state. The southern terminus of the state route is at a T-intersection with US 127 about 1 mile (1.6 km) north of the city limits of Eaton. The northern terminus of SR 726 is at a signalized intersection with SR 121 in downtown New Madison.

State Route 716 (SR 716) is a state highway in the western part of the U.S. state of Ohio. Its southern terminus is at SR 705 in the village of Osgood in northeastern Darke County. The northern terminus of SR 716 is at SR 274 in the village of Chickasaw in southeastern Mercer County. For its entire length, SR 716 runs parallel to, and approximately four miles (6.4 km) to the east of, U.S. Route 127. The highway was assigned in 1937 on a routing from SR 705 in Osgood to an unnumbered highway in Franklin Township. The route was truncated to its current northern terminus in 1973. SR 716 has remained intact ever since.

State Route 627 (SR 627) is an east–west state highway in the northeastern portion of the U.S. state of Ohio. SR 627's western terminus is at a diamond interchange with the US 30/US 62 freeway about 1.50 miles (2.41 km) southeast of Massillon. Its eastern terminus is also at a diamond interchange, this time with I-77 at its Exit 101 in far southern Canton.

State Route 613 (SR 613) is an east–west state highway in the northwestern portion of the U.S. state of Ohio. Its western terminus is at the Indiana state line 4 miles (6.4 km) west of Payne (the route once continued west in Indiana as State Road 14), and its eastern terminus is at US 23 in Fostoria.

State Route 602 (SR 602) is a 14.47-mile-long (23.29 km) north–south state highway in the northern portion of the U.S. state of Ohio. Its southern terminus is at a T-intersection with SR 19 approximately 2.50 miles (4.02 km) northwest of Galion, and its northern terminus is at SR 103 in New Washington.

Ohio State Route 682

State Route 590 (SR 590) is a north–south state highway in the northwestern portion of the U.S. state of Ohio. The southern terminus of SR 590 is at a signalized intersection with SR 12 in the village of Bettsville. Its northern terminus is at a T-intersection with SR 2 just south of Ottawa National Wildlife Refuge, and approximately 5 miles (8.0 km) north of Rocky Ridge.

State Route 651 (SR 651) is a short state highway located in the vicinity of the tripoint of Coshocton, Holmes, and Tuscarawas Counties in Ohio. The route is 3.98 miles (6.41 km) long and is signed east–west. Its western terminus is at SR 643 in the unincorporated community of New Bedford (within Crawford Township) and its eastern terminus is at SR 93 in the village of Baltic.

In Ohio, State Route 680 may refer to:
* Interstate 680 in Ohio, the only Ohio highway numbered 680 since about 1962
* Ohio State Route 680 (1930s-1960s), now SR 681

Ohio State Route 660

State Route 29 (SR 29) is an east–west state highway in the west-central portion of the U.S. state of Ohio. Its western terminus is at the Indiana state line near Celina, where State Road 67 continues west. It continues east to St. Marys where it junctions with U.S. Route 33. In that town, it also crosses State Route 66, State Route 116, and State Route 703, which was its former alignment before a divided highway was built. After turning south it crosses State Route 219 in New Knoxville and then has an interchange with Interstate 75, continuing into Sidney where it meets State Route 47. Still going southeast, it briefly joins State Route 235 before turning east and then south again to enter Urbana. Here the route joins U.S. Route 36, and the concurrency intersects with U.S. Route 68 and State Route 54. From there, State Route 29 leaves U.S. Route 36 and continues to Mutual, intersecting with State Route 161, and State Route 56 shortly after; later, in Mechanicsburg, the route intersects with State Route 4. The route then intersects with State Route 38, U.S. Route 42, and Interstate 70 before reaching its eastern terminus at U.S. Route 40 on the western edge of West Jefferson.

Ohio State Route 710

Ohio State Route 725

Ohio State Route 6 (1923-1927)

In Ohio, State Route 71 may refer to:
* Interstate 71 in Ohio, the only Ohio highway numbered 71 since about 1962
* Ohio State Route 71 (1923), now SR 571

Ohio State Route 670 (1930s-1970s)

State Route 724 (SR 724) is a short east-west state highway situated in the southeastern portion of Ohio. The western terminus of this state route is at a T-intersection with State Route 260 nearly 6 miles (9.7 km) southwest of Summerfield in eastern Noble County, and its eastern terminus is at State Route 145 approximately 2 miles (3.2 km) northwest of Stafford in western Monroe County.

State Route 700 (SR 700) is a 16.71-mile (26.89 km) long north–south state highway in the northeastern portion of the U.S. state of Ohio. The southern terminus of SR 700 is at SR 88 about 5 miles (8.0 km) south of Hiram. Its northern terminus is at a traffic circle where it meets SR 87 in Burton, a point that doubles as the northern terminus of SR 168.

State Route 646 (SR 646) is a 28.78-mile-long (46.32 km) state highway in Harrison and Jefferson Counties in eastern Ohio. The route runs from US 250 in Stock Township, northwest of Cadiz, to SR 43 in Island Creek Township, just outside Wintersville.

State Route 576 (SR 576) is a north–south state highway located in northwestern Ohio, a U.S. state. The highway's southern terminus is at SR 2 on the boundary between Williams and Defiance Counties, approximately 3.25 miles (5.23 km) southwest of Bryan. The northern terminus of SR 576 is at the Michigan state line about 5.50 miles (8.85 km) northwest of Pioneer, where the roadway continuing into Hillsdale County, Michigan is county-maintained Hillsdale Road.

State Route 725 (SR 725) is an east–west state highway in the southwestern portion of the U.S. state of Ohio. Its western terminus is at the Indiana state line approximately 9 miles (14 km) west of Camden at the eastern terminus of Indiana State Road 44; and its eastern terminus is at US 42 just south of Spring Valley.

Ohio State Route 616

Ohio State Route 595

Ohio State Route 718

State Route 689 (SR 689) is a north–south state highway in the southern portion of the U.S. state of Ohio. Its southern terminus is at SR 160 a mile north of Wilkesville, and its northern terminus is at SR 32 about 6 miles (9.7 km) southwest of Albany.

Ohio State Route 63 (1923)

State Route 706 (SR 706) is an east–west state route in western Ohio. The western terminus of SR 706 is at SR 29 in the hamlet of Pasco, and its eastern terminus is at a T-intersection with SR 235 just south of Quincy.

Ohio State Route 63

Ohio State Route 607 (2013)

State Route 696 (SR 696, OH 696) is a north–south state route in the western part of the U.S. state of Ohio. State Route 696's southern terminus is at an interchange with the U.S. Route 30 expressway about 1 mile (1.6 km) east of Beaverdam. Established in the late 1930s, State Route 696 is a two-lane highway that runs through parts of Allen and Putnam Counties. While the northern terminus of State Route 696 has remained static through the years, its southern terminus has been in three different locations throughout the Beaverdam area.

Ohio State Route 71

State Route 643 (SR 643, OH 643) is a two-lane north–south state highway in the central portion of Ohio, a U.S. state. The highway's southern terminus is at a T-intersection with State Route 83 north of Coshocton. Its northern terminus is at a T-intersection with the concurrency of State Route 93 north of Baltic. A section of the route is part of a scenic byway. The route was commissioned in the late 1930s. The northern terminus was relocated to a temporary end with Temporary SR 557, in late 1940's. The highway was paved during the 1950s and 1960s. In the late 1960s the highway's northern terminus was moved to its current location.

Ohio State Route 604

Ohio State Route 64 (1923)

Ohio State Route 568 (1930s-1950s)

Ohio State Route 633

State Route 682 (SR 682) is a north–south state highway in the southeastern portion of the U.S. state of Ohio. The southern terminus of State Route 682 is at a trumpet interchange with US 33, US 50 and SR 32 in Athens. Its northern terminus is at SR 13 in the village of Chauncey, Ohio. SR 682, which was designated in the late 1930s, exists entirely within Athens County, and serves as a southern bypass for the city of Athens. It passes near the main campus of Ohio University.

State Route 660 (SR 660) is an east–west state highway in the east-central portion of Ohio. Existing entirely within Guernsey County, the western terminus of State Route 660 is at State Route 313 just east of the hamlet of Claysville. Its eastern terminus is at a signalized T-intersection with State Route 209 near Cambridge Municipal Airport, 1.25 miles (2.01 km) south of the city limits of Cambridge, as well as State Route 209's interchange off of Interstate 70.

Ohio State Route 68 (1923)

Ohio State Route 662

State Route 625 (SR 625) is a state route in northeastern Ohio that exists entirely within Mahoning County. The southern terminus of SR 625 is at U.S. Route 224 (US 224) near Boardman, and its northern terminus is at US 62 in the southwestern portion of Youngstown. SR 625 is currently signed north–south, but in the past was signed east–west. Until July 2008, SR 625 continued east via US 62, Glenwood Avenue, and Midlothian Boulevard, across Interstate 680 (I-680) and concurrent with SR 170 for a short distance before coming to an end where SR 170 turns off from Midlothian Boulevard onto Youngstown-Poland Road. In 2008, SR 625 was truncated to its current endpoint, and the portions of SR 625 along Glenwood Avenue and Midlothian Boulevard west of I-680 became an extension of SR 170.

Ohio State Route 691

Ohio State Route 70 (1923)

Ohio State Route 66 (1923)

Ohio State Route 708

State Route 611 (SR 611) is an east–west state highway in the northern portion of the U.S. state of Ohio. The western terminus of SR 611 is at a partial interchange with US 6 in Lorain. Its eastern terminus is at a signalized intersection with SR 254 in Avon.

State Route 687 (SR 687) is a 5.70-mile (9.17 km) long east–west state highway in the northeastern portion of the U.S. state of Ohio. Its western terminus is at SR 241 about 4.50 miles (7.24 km) north of Massillon, and its eastern terminus is at the northern junction of I-77 and US 62 approximately 2.50 miles (4.02 km) northwest of downtown Canton.

State Route 671 (SR 671) is an east-west state highway in the southern portion of Ohio. Existing entirely within Vinton County, the western terminus of this short connector route is at SR 327 three miles (4.8 km) northeast of the hamlet of Londonderry. Its eastern terminus is at U.S. Route 50 (US 50) in the unincorporated community of Ratcliffburg.

State Route 715 (SR 715) is an east–west state highway in the central portion of the U.S. state of Ohio. Both of its termini are at US 36, with its western endpoint approximately 4.50 miles (7.24 km) southeast of Danville, and its eastern end on the eastern village limits of Nellie. Near its eastern terminus, SR 715 crosses over the top of the Mohawk Dam.

State Route 678 (SR 678) is a short four-mile-long (6.4 km) north–south state highway located in southeast Ohio. Entirely situated within Laurel Township in Hocking County, SR 678 has its southern terminus at SR 374 approximately one and a half miles (2.4 km) southwest of the hamlet of Gibisonville, and its northern terminus is at SR 180 nearly two and a half miles (4.0 km) northeast of Gibisonville. SR 678 provides a shorter alternative for traffic using SR 374 en route from Hocking Hills State Park up to U.S. Route 33 (US 33) at Rockbridge, in conjunction with SR 180.

State Route 708 (SR 708) is a short two-lane north–south state route that runs exclusively within Logan County, Ohio. The southern terminus of SR 708 approximately two miles (3.2 km) south of Russells Point at SR 235, near the Russells Point Honda manufacturing facility, and its northern terminus is just north of Russells Point at , where the highway becomes Township Road 253 on Orchard Island.

State Route 595 (SR 595) is a north–south state highway in southeastern Ohio, a U.S. state. The route's southern terminus is at a diamond interchange with the (US 33) expressway approximately three and a half miles (5.6 km) southeast of Logan. Its northern terminus is at a T-intersection with SR 216 in New Straitsville, just two blocks southeast of SR 216's northern terminus at SR 93.

State Route 709 (SR 709) is an east–west state route in western Ohio. SR 709 exists entirely in southern Van Wert County. Its western terminus is at SR 118 in Ohio City, and its eastern terminus is at SR 116 just south of Venedocia.

Ohio State Route 627 (1930s-1960s)

Ohio State Route 69 (1923)

State Route 606 (SR 606) is a north–south state highway in the northeastern quadrant of the U.S. state of Ohio. The southern terminus of SR 606 is at a T-intersection with SR 3 approximately 4.50 miles (7.24 km) northeast of Medina. The highway's northern terminus is at another T-intersection, this time with the SR 94/SR 303 concurrency nearly 3.25 miles (5.23 km) west of Richfield. SR 606, which was established in the late 1930s, is a two-lane route located in the northeastern Medina County township of Hinckley. The highway serves the popular Hinckley Reservation, home to the annual "Buzzard Day," which marks the annual arrival of large numbers of buzzards to the area on March 15 of every year.

State Route 669 (SR 669) is an east–west state highway in Perry and Morgan Counties in the US state of Ohio. The western terminus of SR 669 is at an intersection with SR 13, southeast of Somerset. The eastern terminus of SR 669 at an intersection with SR 37 and SR 78. Most of the route is a rural two-lane highway and passes through woodland, farmland, and residential properties. For some of its path, SR 669 runs generally parallel to the west of Muskingum River. SR 669 was commissioned in 1937, along much of the same route as today. The highway was extended to its current western terminus in 1938. The entire route was paved by the mid-1950s.

State Route 650 (SR 650) is a north–south state highway in the southern portion of Ohio. Its southern terminus is at U.S. Route 52 in Hanging Rock. From this point, the route heads northward to the community of Pine Grove in Wayne National Forest. Its northern terminus is at State Route 522 approximately 9 miles (14 km) southeast of Wheelersburg.

Ohio State Route 701

Ohio State Route 672

Ohio State Route 607 (1980s–2000s)

Ohio State Route 643

Ohio State Route 585 (1930s)

State Route 60 (SR 60) is a north–south state highway that runs the entire length of the U.S. state of Ohio, from the Williamstown Bridge over the Ohio River in Marietta to U.S. Route 6 (US 6) near Lake Erie in Vermilion. It is the seventh longest state route in Ohio. Heading south from Vermilion, SR 60 traverses rural North Central Ohio while connecting Vermilion, New London, Ashland, and Loudonville. South of Loudonville, SR 60 enters more hilly country, before entering the Muskingum River Valley at Dresden. It closely parallels the Muskingum River for the remainder of its journey to Marietta except for an eleven-mile (18 km) stretch in Morgan County where it moves inland to avoid bends in the river. Markers for SR 60 are not posted south of the Greene Street/3rd Street intersection in Marietta, the location of SR 26's southern terminus. SR 60 is unsigned along SR 7 / SR 26 / Greene Street and the Williamstown Bridge approach.

Ohio State Route 631

Ohio State Route 602

Ohio State Route 696

Ohio State Route 609

Ohio State Route 71 (1923)

Ohio State Route 684

State Route 723 (SR 723) is a very short state highway located in east-central Ohio. Having a length of just 0.85 miles (1.37 km) and located just southwest of Cambridge, the route serves as a connector between Interstate 70 (I-70) at its exit 176 and the concurrency of U.S. Route 22 (US 22) and US 40.

Ohio State Route 61

Ohio State Route 614

Ohio State Route 655

Ohio State Route 67 (1923)

Ohio State Route 590

Ohio State Route 721

Ohio State Route 606

Ohio State Route 66

Ohio State Route 664

Ohio State Route 680 (disambiguation)

Ohio State Route 68 (disambiguation)

State Route 710 (SR 710) is a 4.06-mile-long (6.53 km) state highway in the central portion of the U.S. state of Ohio. Existing entirely within the northern portion of the city of Columbus, SR 710 begins at an intersection with SR 161, less than one-quarter mile (0.40 km) west of exit 117 off Interstate 71 (I-71). The highway ends at a seven-ramp partial cloverleaf interchange with I-270 at its exit 27. SR 710 was established in 1969. Although signed as an east–west route, the overall path of this route is that of an irregularly shaped inverted "U", with its westernmost and easternmost portions following north–south roadways.

Ohio State Route 671

Ohio State Route 714

Ohio State Route 607 (1986–2006)

Ohio State Route 613

Lloyd Road

Ohio State Route 627

Ohio County Court of Common Pleas

Ohio State Route 678

Ohio State Route 692

State Route 716 (SR 716) is a state highway in the western part of the U.S. state of Ohio. Its southern terminus is at SR 705 in the village of Osgood in northeastern Darke County. The northern terminus of SR 716 is at SR 274 in the village of Chickasaw in southeastern Mercer County. For its entire length, SR 716 runs parallel to, and approximately four miles (6.4 km) to the east of, U.S. Route 127.

Ohio State Route 728

Ohio State Route 63 (1923-1927)

State Route 643 (SR 643, OH 643) is a two-lane north–south state highway in the central portion of Ohio, a U.S. state. The highway's southern terminus is at a T-intersection with State Route 83 north of Coshocton. Its northern terminus is at a T-intersection with the concurrency of State Route 93 north of Baltic. A section of the route is part of a scenic byway.

Ohio State Route 586

Ohio State Route 29

Ohio State Route 718 (SR 718) is a state route in western Ohio. All of SR 718 is situated within western Miami County. The western terminus of SR 718 is at SR 721 west of Pleasant Hill and its eastern terminus is at SR 55 in Troy, near the SR 55 interchange of Interstate 75.

Ohio State Route 636

Ohio State Route 5 (1923)

Ohio State Route 112 (1927)

State Route 609 (SR 609) is a 2.65-mile (4.26 km) long east–west state highway in the northeastern portion of the U.S. state of Ohio. The highway runs from its western terminus at a T-intersection SR 7 approximately 2 miles (3.2 km) west of the village of Orangeville to its eastern terminus at the Pennsylvania State line in Orangeville, where SR 609 meets a county-maintained road that straddles the border, Brockway–Sharon Road (County Road 182, or CR 182), at a T-intersection.

Ohio State Route 598

Ohio State Route 650

Ohio State Highway 724

Ohio State Route 61C

Ohio State Route 607T

Ohio State Route 700

Ohio State Route 62 (disambiguation)

Ohio State Route 723 (1930s-1940s)

Ohio State Route 669

Ohio State Route 687

State Route 609 (SR 609) is a 2.65-mile (4.26 km) long east–west state highway in the northeastern portion of the U.S. state of Ohio. The highway runs from its western terminus at a T-intersection SR 7 approximately 2 miles (3.2 km) west of the village of Orangeville to its eastern terminus at the Pennsylvania State line in Orangeville, where SR 609 meets a county-maintained road that straddles the border, Brockway–Sharon Road (County Road 182, or CR 182), at a T-intersection. SR 609 was designated in the late 1930s. This two-lane state highway primarily serves to connect SR 7 with the village of Orangeville. It has done so throughout its history.

State Route 606 (SR 606) is a north–south state highway in the northeastern quadrant of the U.S. state of Ohio. The southern terminus of SR 606 is at a T-intersection with SR 3 approximately 4.50 miles (7.24 km) northeast of Medina. The highway's northern terminus is at another T-intersection, this time with the SR 94/SR 303 concurrency nearly 3.25 miles (5.23 km) west of Richfield.

Ohio State Route 622

Ohio State Route 694

Ohio State Route 716

State Route 635 (SR 635) is a north–south state highway in the northwestern portion of the U.S. state of Ohio. The southern terminus of SR 635 is at SR 18 in Bascom. Its northern terminus is approximately 1 mile (1.6 km) east of Helena at a T-intersection with US 6.

Ohio State Route 723

State Route 60 (SR 60) is a north–south state highway that runs the entire length of the U.S. state of Ohio, from the Williamstown Bridge over the Ohio River in Marietta to U.S. Route 6 (US 6) near Lake Erie in Vermilion. It is the seventh longest state route in Ohio. Markers for SR 60 are not posted south of the Greene Street/3rd Street intersection in Marietta, the location of SR 26's southern terminus. SR 60 is unsigned along SR 7 / SR 26 / Greene Street and the Williamstown Bridge approach.

State Route 658 (SR 658) is a 11-mile-long (18 km) state highway in Guernsey County, Ohio. Located in the northwest quadrant of the county, it connects SR 209 in Adams Township (northwest of Cambridge) with SR 541 in Wheeling Township.

Ohio State Route 680

Ohio State Route 607 (1980s-2000s)

State Route 705 (SR 705) is a state highway in western Ohio, a U.S. state. The highway's western terminus is in rural northwestern Darke County at SR 49 approximately 5.25 miles (8.45 km) southeast of Fort Recovery, and just a mile south of the Darke-Mercer County Line. Its eastern terminus is at SR 29 nearly 2.75 miles (4.43 km) northwest of Sidney.

Ohio State Route 62 (1923)

Ohio State Route 634

Ohio State Route 618

State Route 617 (SR 617) is a short east–west state route in northeastern Ohio, existing entirely within Springfield Township, Mahoning County. The western terminus of SR 617 is at SR 165 in the unincorporated community of New Springfield. Its eastern terminus is at the Pennsylvania State Line just southeast of the hamlet of Petersburg, where SR 617 turns into Pennsylvania Route 351 (PA 351).

Ohio State Route 60 (1923)

Ohio State Route 581

Ohio State Route 676

State Route 634 (SR 634) is a 17.95-mile-long (28.89 km) state highway in the northwestern portion of the U.S. state of Ohio. The highway runs from its southern terminus at its junction with SR 189 and SR 190 in Fort Jennings to its northern terminus at the intersection of SR 15 nearly 1.5 miles (2.4 km) north of Continental. SR 634 runs entirely within Putnam County and is entirely a two-lane highway.

New Albany–Condit Road

Ohio State Route 64

Ohio State Route 611

Ohio State Route 59

Ohio State Route 652

Ohio State Route 705

State Route 604 (SR 604) is an east–west state highway in north central Ohio. The western terminus of SR 604 is at a T-intersection with US 42 in Jackson Township approximately 5 miles (8.0 km) southwest of West Salem. Its eastern terminus is at the intersection that doubles as the southern split of the concurrency of SR 94 and SR 585 in Chippewa Township nearly 1.5 miles (2.4 km) southeast of Rittman.

Ohio State Route 588

State Route 633 (SR 633) is a short north–south state highway in the northeastern portion of the U.S. state of Ohio. Occupying a portion of Lloyd Road, SR 633 has its southern terminus at a signalized intersection with U.S. Route 20 (US 20) in Wickliffe. Its northern terminus is also in Wickliffe, but at a signalized intersection with Lakeland Boulevard (former SR 2), which provides access to current SR 2 freeway by way of a trumpet interchange just to the east.

Ohio County Courthouse (Hartford, Kentucky)

State Route 722 (SR 722) is an east–west state highway in the western portion of the U.S. state of Ohio. The western terminus of SR 722 is at a T-intersection with SR 121 approximately 3.25 miles (5.23 km) southwest of New Madison. Its eastern terminus is at SR 49 nearly 3.75 miles (6.04 km) east of the village of Gordon.

State Route 711 (SR 711), also known as the "Robert E. Hagan Memorial Highway" between its southern terminus and US 422, is a three-mile (5 km), four-lane, north–south, limited access freeway. It is located in Mahoning and Trumbull counties. Its termini are I-680 to the south and the I-80 / SR 11 interchange to the north. The north-end ramps are directional, only serving travelers to and from the east via Interstate 80 and the north via State Route 11.

Ohio State Route 596

Ohio State Route 42 (1923-1927)

Ohio State Route 646

Ohio State Buckeyes football, 1891

State Route 637 (SR 637) is a 26.13-mile (42.05 km) state route that runs between U.S. Route 224 (US 224) and Arthur in the US state of Ohio. Most of the route is a rural two-lane highway and passes through farmland. The highway was first signed in 1937 on much the same alignment as today, only reaching as far north as an intersection with SR 111. Some of the highway was paved in 1939, with the rest of the route being paved in 1948. SR 637 was extended in 1983, to an intersection with SR 66.

In Ohio, State Route 6 may refer to:
* U.S. Route 6 in Ohio, the only Ohio highway numbered 6 since 1931
* Ohio State Route 6 (1923-1927), now SR 4 (Cincinnati to Middletown), SR 73 (Middletown to Franklin), and old US 25 (Franklin to Michigan)
* Ohio State Route 6 (1927), now US 250
* Ohio State Route 6 (pre-1931), now SR 283

State Route 621 (SR 621) is a north–south state highway in the central part of the U.S. state of Ohio. The southern terminus of SR 621 is at U.S. Route 36 (US 36) approximately two and a half miles (4.0 km) northeast of Coshocton, and its northern terminus is adjacent to the North Appalachian Experimental Watershed Station, just north of its intersection with White Eyes Township Road 188, about 5 miles (8.0 km) northwest of the hamlet of Fresno. Continuing north after SR 621 ends is County Road 190 (CR 190). Established in the early 1940s, SR 621 is a two-lane spur route whose primary purpose is to provide access to the North Appalachian Experimental Watershed Station from the state highway network. The entirety of the route exists within Coshocton County.

State Route 63 (SR 63) is a 11.74-mile (18.89 km) long east–west state highway located in the southwestern portion of the U.S. state of Ohio. The western terminus of SR 63 is at a trumpet interchange with SR 4 on the western outskirts of Monroe. Its eastern terminus is at a signalized intersection with US 42, SR 48 and SR 123 in downtown Lebanon.

Ohio State Route 617

Ohio State Route 691 (SR 691, OH 691) is a north–south state route in southern Ohio. The entirety of SR 691 is within Athens County. Its southern terminus is at OH 56 about 1.5 miles (2.4 km) northwest of New Marshfield, and its northern terminus is at an interchange with US 33 and SR 78 in Nelsonville.

Ohio State Route 675

Ohio State Route 675 (disambiguation)

Ohio State Route 62

Ohio State Route 632

Ohio State Route 6

Ohio State Route 589

Ohio State Route 70 (disambiguation)

Ohio State Route 668

Ohio State Route 697

State Route 600 (SR 600) is an east–west state highway in the northwestern portion of the U.S. state of Ohio. The western terminus of State Route 600 is at US 23 about 5 miles (8.0 km) west of Gibsonburg. Its eastern terminus is at US 20 in the unincorporated community of Hessville approximately 4.25 miles (6.84 km) east of Gibsonburg.

Ohio State Route 625

Ohio State Route 704

State Route 65 (SR 65) is a north–south highway in western Ohio. Its southern terminus is at State Route 47 near Sidney, and its northern terminus is at its interchange with Interstate 280 in Toledo. From south to north, the route passes through the cities of Jackson Center, Uniopolis, Lima, Columbus Grove, Ottawa, Leipsic, Belmore, McClure, Grand Rapids, Perrysburg, Rossford, and Toledo. Route 65 parallels the south bank of the Maumee River for its northernmost 32 miles, from east of Napoleon to Toledo.

Ohio State Route 683

Ohio State Route 613 (1930s-1940s)

Ohio State Route 69

Ohio State Route 724

State Route 589 (SR 589) is a north–south state highway in the western part of the U.S. state of Ohio. SR 589's southern terminus is at SR 55 in the village of Casstown. The northern terminus of SR 589 is at a T-intersection with SR 29 approximately 5.50 miles (8.85 km) southeast of the city limits of Sidney.

State Route 701 (SR 701, OH 701) is a 8.96-mile (14.42 km) east–west state highway in western Ohio, a U.S. state. The state highway's western terminus is at a T-intersection with SR 309 nearly 3 miles (4.8 km) southeast of Ada. The eastern terminus of State Route 701 is at U.S. Route 68 (US 68) approximately 3.50 miles (5.63 km) southeast of Dunkirk.

State Route 666 (SR 666) is a 14.17-mile (22.80 km) state route that runs between Zanesville and Dresden in the US state of Ohio. Most of the route is a rural two-lane highway and passes through both woodland and farmland. For much of its path, SR 666 runs generally parallel to the east of the Muskingum River. The highway was first signed in 1937 on the same alignment as today. The whole highway was paved by 1955.

Ohio State Route 644

Ohio State Route 719

Ohio State Route 673

State Route 692 (SR 692) was a short north–south state route in southern Ohio that was located entirely within Meigs County. The southern terminus of SR 692 was at SR 143 approximately three miles (4.8 km) northwest of the hamlet of Harrisonville. Its northern terminus was at SR 681 near the hamlet of . In 2013, the Ohio Department of Transportation (ODOT) removed SR 692 from the state highway system by making the route north of Pageville an extension of SR 684 and the remainder being transferred to Meigs County's jurisdiction.

State Route 618 (SR 618) is a 7.45-mile (11.99 km) long east–west state highway in the southeastern quadrant of the U.S. state of Ohio. The western terminus of SR 618 is at an interchange with the concurrency of U.S. Route 50 (US 50), SR 7 and SR 32 about 3.25 miles (5.23 km) west of Belpre. Its eastern terminus is in northern Belpre at an interchange with SR 7.

State Route 690 (SR 690) is a north–south state highway in southeastern Ohio, a U.S. state. The southern terminus of SR 690 is at the concurrency of US 50 and SR 32 about 6 1⁄2 miles (10.5 km) east of Athens in the community of Canaanville. Its northern terminus is at SR 550 approximately two miles (3.2 km) west of Amesville. This two-lane state highway was established in the late 1930s. Running entirely within Athens County, SR 690 passes through Wayne National Forest and serves as a quicker route connecting SR 550 to the Athens Bypass.

Ohio State Route 601

Ohio State Route 726

Ohio State Route 72

State Route 63 (SR 63) is a 11.74-mile (18.89 km) long east–west state highway located in the southwestern portion of the U.S. state of Ohio. The western terminus of SR 63 is at a trumpet interchange with SR 4 on the western outskirts of Monroe. Its eastern terminus is at a signalized intersection with US 42, SR 48 and SR 123 in downtown Lebanon. The westernmost portion of SR 63 between SR 4 and I-75 is a four-lane divided highway. It is signed as Hamilton–Lebanon Road. From I-75 east to downtown Lebanon, SR 63 is a two-lane route that is signed as Main Street. Before the construction of the SR 129 freeway between Hamilton and I-75, SR 63 in combination with SR 4 provided the quickest connection between Hamilton and Lebanon.

State Route 29 (SR 29) is an east–west state highway in the west-central portion of the U.S. state of Ohio. Its western terminus is at the Indiana state line near Celina, where State Road 67 continues west. It continues east to St. Marys where it junctions with U.S. Route 33. In that town, it also crosses State Route 66, State Route 116, and State Route 703, which was its former alignment before a divided highway was built. After turning south it crosses State Route 219 in New Knoxville and then has an interchange with Interstate 75, continuing into Sidney where it meets State Route 47. Still going southeast, it briefly joins State Route 235 before turning east and then south again to enter Urbana. Here the route joins U.S. Route 36, and the concurrency intersects with U.S. Route 68 and St

State Route 683 (SR 683) is a north–south state highway in the southern portion of the U.S. state of Ohio. The southern terminus of State Route 683 is at a T-intersection with State Route 93 about 0.50 miles (0.80 km) north of Hamden. Its northern terminus is also at a T-intersection, this time with U.S. Route 50 nearly 6 miles (9.7 km) west of McArthur.

Ohio State Route 591

State Route 604 (SR 604) is an east–west state highway in north central Ohio. The western terminus of SR 604 is at a T-intersection with US 42 in Jackson Township approximately 5 miles (8.0 km) southwest of West Salem. Its eastern terminus is at the intersection that doubles as the southern split of the concurrency of SR 94 and SR 585 in Chippewa Township nearly 1.5 miles (2.4 km) southeast of Rittman. Created in the late 1930s, this primarily rural route traverses the northeastern corner of Ashland County and the northern tier of Wayne County. State Route 604 passes through one incorporated community along its path, Congress, where it meets SR 539.

Ohio State Route 666

Ohio State Route 584

Ohio State Route 637

Ohio State Highway 723

State Route 59 (SR 59) is an east–west state highway in the northeastern portion of Ohio, a U.S. state. The western terminus of State Route 59 is in downtown Akron at a partial interchange with the Interstate 76/Interstate 77 concurrency. The eastern terminus of the state route is at State Route 5 just 0.5 miles (0.80 km) east of the Ravenna city limits.

Ohio State Route 571 (1930s-1950s)

Ohio State Route 709

State Route 621 (SR 621) is a north–south state highway in the central part of the U.S. state of Ohio. The southern terminus of SR 621 is at U.S. Route 36 (US 36) approximately two and a half miles (4.0 km) northeast of Coshocton, and its northern terminus is adjacent to the North Appalachian Experimental Watershed Station, just north of its intersection with White Eyes Township Road 188, about 5 miles (8.0 km) northwest of the hamlet of Fresno. Continuing north after SR 621 ends is County Road 190 (CR 190).

Ohio State Route 690

Ohgo Suzuka

Ohio State Route 6 (1927)

Ohio State Route 6 (disambiguation)

Ohio State Route 6 (pre-1931)