U.S. Route 23 (US 23) is a United States Numbered Highway that runs from Jacksonville, Florida, to Mackinaw City, Michigan. In the state of Ohio, it is a major north–south state highway that runs from the Kentucky border at Portsmouth to the Michigan border at Sylvania.

Route description

The route crosses over the Ohio River via the U.S. Grant Bridge into the city of Portsmouth. Through downtown Portsmouth, it follows parallel one-way streets; northbound traffic is on Gay Street and southbound on Chillicothe Street. These roads merge into Scioto Trail, which becomes a divided highway north of Rosemount, and again north of Lucasville, through Piketon to just south of Waverly.

Within Waverly, the route runs concurrently with State Route 104 (SR 104), in addition to a four-block concurrency with SR 335 that ends in downtown Waverly. The concurrency with SR 104 ends just south of Chillicothe at which point US 23 becomes an expressway. The route bypasses Chillicothe to the east, including a short concurrency with US 35 before once again becoming a divided highway near Kingston. It continues as such through Circleville to the southern edge of Columbus, at the southern junction of Interstate 270 (I-270).

Columbus

Protected bike lane and bus stop island on Summit Street near the Ohio State University campus

In downtown Columbus, the route is applied to a one-way pair. It first jogs easterly via Fulton Street (north) and Mound Street (south) before continuing northerly with northbound traffic on Fourth Street and southbound traffic on Third Street, which becomes Summit Street north of Fifth Avenue. The one-way pair ends at Hudson Street on the border of the SoHud and Glen Echo neighborhoods; both directions of US 23 jog westerly onto Hudson Street before continuing northerly on Indianola Avenue, closely paralleling I-71. The route then moves westerly again via Morse Road, then north again onto High Street on the north edge of the East Beechwold neighborhood. North of the northern junction with I-270, High Street becomes Columbus Pike.

The section immediately north of the northern junction with I-270 was upgraded with a northbound-only set of express lanes which passes under Dimension Drive, Campus View Boulevard, Radio City Boulevard, and Flint Road, with the former alignment of US 23 providing access to those roads. This configuration, known as the "Trench", opened to traffic in September 2015, and its construction coincides with a reconfiguration of the I-270 exit. After the Trench, US 23 leaves Columbus heading north.

North of Columbus

Heading north, US 23 becomes a four-lane road with a grass median, intersections at street level, and numerous public and private driveways. Starting at a short concurrency with US 42 south of Delaware, the route becomes a freeway through downtown Delaware, intersecting with US 36 and ending the concurrency with US 42. North of downtown Delaware, US 23 becomes a five-lane road, with a center lane dedicated for left-hand turns, from both directions. When it reaches the Delaware Dam and Delaware State Park south of Waldo, a grass median returns. From Waldo to southwest of Carey, the route is an expressway, all intersections with numbered U.S. and state routes are Interstate-style interchanges, while most county and local streets that intersect, are at street level and unsignaled. US 23 bypasses Waldo, Marion, and Upper Sandusky to the east. To the east and north of Upper Sandusky, US 23 runs concurrently with US 30 for about 10 miles (16 km). Southwest of Carey the route then departs the expressway passing through Carey, running concurrently with SR 103 while the expressway continues westerly as SR 15. Within Carey, the concurrency with SR 103 ends, and a concurrency with SR 199 begins. The two cosigned routes continue as a rural highway to Fostoria.

Within Fostoria, US 23 runs concurrently with SR 18 while turning westerly along Lytle Street, then northerly along the Midblock Underpass in concurrency with SR 12. At the northern end of the expressway, SR 12 departs while US 23, still concurrent with SR 18/SR 199, continues westerly along South Street, then northerly along County Line Street. SR 18/SR 199 departs within Fostoria city limits, while US 23 continues northerly and becomes Fostoria Road. Northeast of Bradner, the route has a junction with US 6.

Northwest of Woodville, the route runs concurrently with US 20; the highway continues northwesterly to Perrysburg. There, US 23 begins a brief wrong-way concurrency with I-75, then departs for a concurrency with I-475, the western bypass of the Toledo metropolitan area. US 23 and I-475 run concurrently for the latter route's entire north–south portion, until I-475 departs in Sylvania to become an east–west aligned route. US 23 then continues northerly into Michigan as a freeway.

History

Before the establishment of the U.S. Numbered Highway System in 1926, the route of what would eventually become US 23 was numbered as SR 4 from Portsmouth to Marion; SR 22 from Marion to Carey; SR 63 from Carey to Fostoria; SR 199 from Fostoria to Millbury; and SR 2 from Millbury to Toledo. Over the years, portions of US 23 have been realigned to divided highway, freeway, or expressway portions. Among these are a bypass of Circleville built in 1958; the Marion–Carey expressway routing, on which work began in 1962; and a bypass of Chillicothe, on which work began in 1966.

On the 1926 Ohio Department of Highways and Public Works map, published before the finalization of the U.S. Numbered Highway System in late 1926, US 23 followed its current routing from Fostoria to Woodville, then continued north along present-day Fostoria Road into Millbury and northwest along present-day SR 51 (Woodville Road) into East Toledo. There, it followed East Broadway Avenue, Starr Avenue, and Main Street to the Cherry Street Bridge (now the Martin Luther King Bridge) across the Maumee River. The route then followed Cherry Street (present-day SR 120) to Detroit Avenue (US 24), before turning west onto Laskey Road and north onto Lewis Avenue. On the 1927 map, the Fostoria–Toledo routing was shifted westerly, taking a northwest–southeast route that was originally designated SR 63 between Fostoria and Perrysburg, then East River Road into Toledo. It crossed the Maumee River via the Fassett Street Bridge, then followed South, Sumner, Logan, Summit, and Huron streets to rejoin its original routing. The Fostoria–Millbury routing was designated SR 199, and the Millbury–Toledo routing became SR 102, which in turn became present-day SR 51 in 1955. By 1940, US 23 was shifted westerly again in Toledo, taking the Anthony Wayne Bridge to Summit Street, then to Jefferson Avenue and Collingwood Boulevard before rejoining the previous routing.

US 23 was realigned c.1960 to follow Monroe Street northwesterly out of Toledo, joining with the first constructed segment of its current freeway routing in Sylvania. The freeway was extended southerly to US 20 (Central Avenue) by 1964.

By 1969, the entire western freeway bypass of Toledo was complete, carrying the current routings of both US 23 and I-475. In addition, US 23 and SR 199 were swapped north of Fostoria in 1969, as US 23 reverted to its pre-1927 routing between Fostoria and Woodville, then running concurrently with US 20 from there to Perrysburg. The 1927–1969 routing of US 23 between Fostoria and Perrysburg thus became part of SR 199.

A plan was proposed by the Ohio Department of Transportation (ODOT) in July 2020 to improve safety along US 23 in Wyandot County by reconfiguring several intersections and closing others to eliminate cross traffic and turns across opposing traffic for the stretch of US 23 between the interchange at SR 231 in Marion County and the interchange at SR 199 south of Upper Sandusky. After public comments, the proposal was revised to drop one intersection from the plan over concerns about the impact on emergency services. The rest of the plan was rejected by the Wyandot County Commission in May 2021 because of the impacts on the community and the community's preference for an interchange at SR 294.

Weigh stations were once located on US 23 just north of the split with US 35, but they were decommissioned and later converted into truck parking in 2023. Ross County had wanted the space to be utilized into a full interchange with Marietta and Seney Roads as a part of their 2008 Thoroughfare Plan.

Future

North of Upper Sandusky in Salem Township, Wyandot County, there have been a number of serious crashes at the intersection with County Road 44 and Township Road 44 from 2016 to 2021. To improve its safety, beginning April 11, 2022, ODOT will convert the intersection to a pair of right-in/right-outs and close the median crossover. Once this conversion is completed, the stretch of US 23 from SR 199 south of Upper Sandusky, through this junction, will be free of cross traffic and turns across opposing traffic.

An interchange is planned to be constructed at the intersection with State Route 762 in Pickaway County.

In 2021, ODOT reopened a study of the US 23 corridor between the village of Waldo and I-270.

US 23 in Ohio has been planned to be incorporated into Interstate 73, with a renewed push in the 2020s.

Major intersections

CountyLocationmikmExitDestinationsNotes
Ohio River0.000.00US 23 south (Country Music Highway)Continuation into Kentucky
U.S. Grant Bridge; Kentucky–Ohio state line
SciotoPortsmouth0.450.72SR 73 west / SR 104 north / Ohio River Scenic Byway Alt. east (US 23 Bus. north) / US 23 northSouthern end of southbound SR 73/SR 104/ORB Alt. concurrency; eastern terminus of SR 73; southern terminus of SR 104; southern terminus of US 23 Bus.
0.560.90SR 73 / Ohio River Scenic Byway Alt. west / SR 104 north (2nd Street west)Northern end of southbound SR 73/SR 104/ORB Alt. concurrency
0.991.59US 23 Bus. south (Chillicothe Street south)Northern terminus of US 23 Bus.; no access from US 23 north (Gay Street)
1.061.71US 52 / Ohio River Scenic Byway east / US 23 Truck (11th Street)One-way street; northern terminus of US 23 Truck
1.131.82US 52 / Ohio River Scenic Byway west / US 23 Truck south (12th Street) to SR 73 west / SR 104 northOne-way street
Lucasville11.4318.39SR 728 east (Lucasville-Minford Road) / SR 348 west – OtwayEastern terminus of SR 348; western terminus of SR 728
11.9219.18SR 823IrontonInterchange
PikeScioto Township20.6333.20American Centrifuge FacilityHalf-folded diamond interchange; access to Portsmouth Gaseous Diffusion Plant
Seal Township23.0837.14SR 32 / SR 124Jackson, CincinnatiDiamond interchange
WaverlyPride Drive (SR 220 Truck)Southern end of SR 220 Truck concurrency
28.5345.91SR 104 south (Lake White Road)Southern end of SR 104 concurrency
29.1746.94SR 220 (Market Street) / SR 220 Truck ends / SR 335 beginsSouthern end of SR 335 concurrency; northern end of SR 220 Truck concurrency; northern terminus of SR 220 Truck; counterclockwise terminus of SR 335
29.5247.51SR 335 east (Clough Street)Northern end of SR 335 concurrency
RossFranklin Township35.6357.34SR 372 east (Stoney Creek Road)
Scioto Township41.4066.6341US 23 Bus. / SR 104 north (Bridge Street) / Three Locks RoadNorthern end of SR 104 concurrency; southern end of freeway; US 23 Bus, not signed southbound
43.2269.5643AUS 50 (Eastern Avenue) to US 35 east
43.7070.3343BUS 35 / US 50 east – Jackson, AthensSouthern end of US 35 concurrency; southbound left exit and northbound entrance
44.9872.3944Main Street to US 50 west – Chillicothe
46.0274.0646US 35 west – DaytonNorthern end of US 35 concurrency; northbound left exit and southbound entrance
Springfield Township48.7878.5048US 23 Bus. south / SR 159 (Bridge Street) – Kingston, ChillicotheServes Adena Regional Medical Center; US 23 Bus. not signed northbound
Green Township50.7881.7250SR 207 northNorthern end of freeway
PickawayPickaway Township57.2492.12SR 361 east
Circleville63.92102.87US 22 / SR 56Circleville, Washington Court HouseFive-ramp partial cloverleaf; northbound exit via Mound Street
South Bloomfield72.14116.10SR 316 east (Ashville Road) – AshvilleSouthern end of SR 316 concurrency
72.42116.55SR 316 west (North Street)Northern end of SR 316 concurrency
72.75117.08SR 752 east
Harrison Township76.24122.70SR 762Commercial Point
FranklinHamilton Township80.37129.34SR 665 west / SR 317 east – Groveport, Rickenbacker Airport
83.36– 83.39134.15– 134.2083I-270 (Columbus Bypass) to I-71Interchange; signed as exits 83A (east) and 83B (west) southbound; I-270 exit 52
Columbus86.28138.85SR 104 north to US 33 SR 104 south to I-71Interchange; SR 104 exit 91
89.04– 89.13143.30– 143.44I-70 / I-71Interchange; northbound entrance only; I-70 exit 100B; to be replaced by new interchange north of freeway
US 33 (3rd Street)Southern end of northbound US 33 east concurrency; one-way street, inbound access only from US 33
US 33 east (Livingston Avenue east)Northern end of northbound US 33 east concurrency; southern end of US 33 west concurrency
89.13143.44I-71 south / I-70 westI-70 exit 100B
I-70 east – WheelingFuture off-ramp to replace old ramp south of freeway
I-70 / I-71Future on-ramp to replace old ramp south of freeway; access from I-70 east/I-71 north only
89.32143.75US 62 / SR 3 north (Main Street) to I-71 northSouthern end of US 62/SR 3 concurrency; one-way street
89.41143.89US 62 / SR 3 south (Rich Street) to SR 315One-way street, outbound access only to US 62/SR 3
89.75144.44US 62 north / US 40 / SR 16 (Broad Street)Northern end of US 62 concurrency
89.95144.76US 33 (Long Street) / SR 3 north (Long Street east)One-way street, inbound access only from US 33
90.04144.91US 33 west / SR 3 south (Spring Street)Northern end of US 33 west/SR 3 concurrency; one-way street
Convention Center ParkingSouthbound exit and entrance only; interchange
90.66145.90I-670 to I-71Dayton, AirportI-670 exit 4
Worthington99.66160.39SR 161 (Dublin Granville Road)
101.23162.91101AI-270 east to I-71Interchange; I-270 exit 23; SR 315 exit 12A; no exit number southbound; consolidated into one single exit southbound
101BI-270 west / SR 315
Flint101.69– 101.97163.65– 164.10Campus View Boulevard / Flint RoadInterchange northbound via local lanes; at-grade intersections southbound
DelawareOrange Township104.36167.95SR 750Powell, Columbus Zoo
Delaware111.74179.83SR 315 south (Olentangy River Road)
113.36– 113.60182.44– 182.82US 42 southSouthern end of US 42 concurrency; partial interchange via connector road; serves Delaware Municipal Airport; southern end of freeway
114.86184.85114US 42 north / US 36 (William Street) to SR 37Northern end of US 42 concurrency; northbound exit and southbound entrance
115.09185.22115SR 37 (Central Avenue) to US 42 north / US 36Southbound exit and northbound entrance
115.96186.62N. Sandusky StreetPartial interchange via northbound entrance ramp and at-grade intersection; former incomplete full interchange with southbound exit; northern end of freeway
Marlboro Township124.39200.19SR 229Norton, Ashley
MarionWaldo126.35203.34126SR 98Waldo, BucyrusInterchange; access to SR 47 and SR 423
RichlandPleasant township lineNewmans-Cardington RoadAt-grade intersection; southern end of freeway
Marion Township134.56216.55134SR 95Marion, Mount Gilead
135.57218.18135SR 309Marion, Galion
137.14220.71137Marion-Williamsport Road
Grand Prairie TownshipLinn Hipsher Road (CR 195)At-grade intersection; northern end of freeway
140.64226.34140SR 4BucyrusInterchange
143.52230.97143SR 231Morral, NevadaInterchange
WyandotPitt Township148.00238.18SR 294Harpster
151.68244.11SR 199Southern end of freeway; southern terminus of SR 199
Crane Township153.81– 153.86247.53– 247.61US 30 east – Bucyrus, MansfieldSouthern end of US 30 concurrency
Upper Sandusky155.48250.22CR 330 (E. Wyandot Avenue) – Upper SanduskyNorthern end of freeway; Lincoln Highway
158.17254.55SR 53 / SR 67Upper Sandusky, TiffinSouthern end of freeway
159.42256.56SR 199Upper Sandusky
Salem Township159.82– 160.54257.21– 258.36US 30 west – Van WertNorthern end of US 30 concurrency; left exit and entrance northbound
161.599260.068CR 44At-grade intersection; northern end of freeway; scheduled to become a pair of RIROs April 2022
Crawford Township167.353– 167.62269.329– 269.76SR 15 west to I-75Findlay, Toledo SR 103 westInterchange; eastern terminus of SR 15; southern end of SR 103 concurrency
Carey168.82271.69SR 103 east / SR 199 south (E. Findlay Street) / SR 568 west (W. Findlay Street)Northern end of SR 103 concurrency; southern end of SR 199 concurrency
SenecaLoudon Township178.20286.79US 224Findlay, Tiffin
Fostoria182.99– 183.00294.49– 294.51SR 18 eastSouthern end of SR 18 concurrency
183.51295.33SR 12 westSouthern end of SR 12 concurrency
183.81295.81SR 12 eastNorthern end of SR 12 concurrency
SenecaHancock county line184.33296.65SR 18 (North Street) / SR 613 westNorthern end of SR 18 concurrency; eastern terminus of SR 613
SenecaWood county line185.26298.15SR 199 northNorthern end of SR 199 concurrency
WoodSandusky county lineMontgomeryFreedomMadisonScott township quadripoint196.95316.96US 6Bowling Green, Fremont
FreedomMadison township line199.95321.79SR 600 east – GibsonburgWestern terminus of SR 600
202.81326.39SR 105Woodville, PembervilleRoundabout
TroyWoodville township line204.40328.95SR 582 eastSouthern end of SR 582 concurrency
204.44329.01SR 582 westNorthern end of SR 582 concurrency
205.95331.44US 20 east – Woodville, FremontSouthern end of US 20 concurrency
WoodTroy Township208.25– 208.82335.15– 336.0681Pemberville Road / SR 420 north to I-280ToledoExit number follows US 20; to Ohio Turnpike (I-80/I-90); signed as exits 81A (SR 420) and 81B (Pemberville Road)
LemoyneLemoyne RoadInterchange via connector roads
Stony Ridge211.10339.73SR 163 eastWestern terminus of SR 163
Perrysburg217.18349.52I-75 north / US 20 west – Toledo, PerrysburgNorthern end of US 20 concurrency; eastern end of I-75 concurrency; southern end of freeway section; I-75 exit 193
219.03– 219.40352.49– 353.091AI-75 south / I-475 begins – DaytonWestern end of I-75 concurrency; southern end of I-475 concurrency; exit numbers follow I-475; I-75 exit 192
2SR 25Bowling Green, Perrysburg
LucasMaumee222.74358.474US 24 (Anthony Wayne Trail) – Napoleon, Maumee
224.37361.095US 20A (Illinois Avenue / Dana Drive)New diverging diamond interchange opened on August 4, 2025
Monclova Township224.72361.656To I-80 / I-90 / Ohio Turnpike / Salisbury Road / Dussel DriveSalisbury Road runs west, Dussel Drive runs east; opened 1989
Springfield Township226.89365.148SR 2 (Airport Highway) – Toledo Express Airport, Swanton, ToledoSigned as exits 8A (east) and 8B (west) southbound
229.95370.0711SR 246 east (Dorr Street)Western terminus of SR 246; added 2021
Sylvania Township231.81373.0613US 20 / SR 120 (Central Avenue)
231.98373.34232I-475 east – ToledoNorthern end of I-475 concurrency; exit numbers follow US 23; left exit southbound; I-475 exit 14
Sylvania234.18376.88234US 223 north / SR 51SylvaniaSouthern end of US 223 concurrency; northern terminus of SR 51; to SR 184
234.83377.92US 23 north / US 223 north – Ann ArborContinuation into Michigan
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminusIncomplete accessUnopened

External links

U.S. Route 23
Previous state: KentuckyOhioNext state: Michigan