State Route 204 is a state route in central Ohio. It starts at SR 256 in Pickerington, and ends at US 22 near Mount Perry. At a length of 37.79 miles (60.82 km), the route is located parallel to Interstate 70 in Fairfield and Perry counties east of Columbus, the state capital.

State Route 310 (SR 310) is a north–south state route in the central portion of Ohio. The highway extends 13.99 miles (22.51 km) from its southern terminus at SR 204 south of the hamlet of Etna to the northern terminus at SR 37 approximately two miles (3.2 km) southeast of Johnstown.