State Route 657 (SR 657) is a state highway in central Ohio, a U.S. state. While signed as a north–south route, State Route 657 actually travels in a northwest–southeast fashion. The southern terminus of the route is at a T-intersection with SR 13 immediately north of the city limits of Newark. Its northern terminus is at a T-intersection with the concurrency of US 36 and SR 3 about northeast of Centerburg.
