List of Interstate Highways in Ohio
| Interstate Highways of Ohio | |
|---|---|
Highway markers for I-71, I-275, and BL-75 | |
A map of all the Interstate Highways in Ohio | |
| System information | |
| Length | 1,572.35 mi (2,530.45 km) |
| Formed | June 29, 1956 |
| Highway names | |
| Interstates | Interstate nn (I-nn) |
| Business Loops: | Business Loop Interstate nn (BL I-nn) |
| System links | |
| |
There are 21 Interstate Highways in Ohio, including both primary and auxiliary routes. With the exception of the Ohio Turnpike (which carries portions of Interstate 76 (I-76), I-80, and I-90), all Interstate Highways in the state are owned and maintained by Ohio Department of Transportation (ODOT); however, they were built with money from the Federal Government. The total road mileage of the 21 Interstates is 1,572.35 miles (2,530.45 km). Ohio has more route miles than this, most of which comes from I-80 running concurrently with I-90 for 142.80 miles (229.81 km) and I-70 and I-71 running concurrently through Columbus. The Interstate Highways in Ohio range in length from I-71, at 248.15 miles (399.36 km), all the way down to I-471, at 0.73 miles (1.17 km).
As of 2019, out of all the states, Ohio has the fifth-largest Interstate Highway System. Ohio also has the fifth-largest traffic volume and the third-largest quantity of truck traffic. Ohio ranks second in the nation in terms of the number of bridges for its Interstates.