State Route 555 (SR 555) is a 62.36-mile-long (100.36 km), north–south running state highway that passes through four counties in southeastern Ohio. State Route 555's southern terminus is at the concurrency of US 50, SR 7 and SR 32 (James A. Rhodes Appalachian Highway) in the unincorporated community of Little Hocking in extreme southwestern Washington County. Its northern terminus is at SR 60 in Wayne Township, just outside Zanesville. The route passes through primarily rural portions of Washington, Morgan, Perry, and Muskingum counties, connecting unincorporated villages along the way. Its emergence into southern Zanesville at the route's northern end takes the route into a more suburban setting before it terminates.