State Route 18 (Ohio)
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Route of SR 18 highlighted in red
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| Route information | ||||
| Maintained by ODOT | ||||
| Length: | 197.39 mi (317.67 km) | |||
| Existed: | 1924 – present | |||
| Major junctions | ||||
| West end: |
 SR 8 near Hicksville
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 I-75 near North Baltimore I-71 near Medina  I-77 / SR 21 near Fairlawn I-76 in Akron
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| East end: |
 SR 91 in Akron
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| Location | ||||
| Counties: | Defiance, Henry, Wood, Hancock, Seneca, Sandusky, Huron, Lorain, Medina, Summit | |||
| Highway system | ||||
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| Location: | North Baltimore |
| Length: | 1.934 mi (3.112 km) |
| Existed: | 2012–present |
State Route 18 (SR 18) is an east–west highway in northern Ohio. It is the sixth longest state route in Ohio. Its western terminus is at the Indiana state line near Hicksville, Ohio (the route continues in Indiana as State Road 8), and its eastern terminus is at State Route 91 in Akron, Ohio.
State Route 18 was an original state highway that went from Norwalk to the Pennsylvania state line. The route was extended to the Indiana state line in 1926. Until 1950, it was one of a very few Ohio routes to end at two state lines.
State Route 18's extension to the Indiana state line originally overlapped State Route 2 from the line to Hicksville. In 1940, State Route 18 was rerouted on the former State Route 193 from the line to Hicksville.
In 1950, State Route 18's eastern terminus was moved to Youngstown. Its old route to the Pennsylvania state line was recertified as State Route 289.
In 1966, the route was routed along State Route 8 and Interstate 80S (now Interstate 76) to Youngstown. This series of concurrencies ended in 1971, and State Route 18 would eventually be routed along Market Street in Akron, to end at its current terminus.
In 1969, State Route 18 was routed concurrently with U.S. Route 20 along the Norwalk Bypass, a limited access freeway. Prior to the Bypass route, State Route 18 followed Main Street and Woodlawn Avenue (formerly known as Medina Street) and later followed Main Street and Akron Road through the city of Norwalk (much of this alignment was already concurrent with US 20).
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