Ohio State Route 378
| Route information | ||||
|---|---|---|---|---|
| Maintained by ODOT | ||||
| Length | 9.46 mi (15.22 km) | |||
| Existed | 1935–present | |||
| Major junctions | ||||
| South end | SR 243 in Union Township | |||
| North end | SR 141 in Aid Township | |||
| Location | ||||
| Country | United States | |||
| State | Ohio | |||
| Counties | Lawrence | |||
| Highway system | ||||
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State Route 378 (SR 378) is a north–south state highway in the south-central portion of Ohio. SR 378's southern terminus is at SR 243 about 5 miles (8.0 km) south of the unincorporated community of Willow Wood. Its northern terminus is at SR 141 nearly 4 miles (6.4 km) northwest of Willow Wood.
Created in the mid-1930s, and existing entirely in Lawrence County, SR 378 parallels Symmes Creek for its entire length. A part of the northern segment of the state highway runs through a small section of Wayne National Forest.