State highway in Hocking County, Ohio, US
State Route 678 (SR 678) is a short four-mile-long (6.4 km) north–south state highway located in southeast Ohio. Entirely situated within Laurel Township in Hocking County, SR 678 has its southern terminus at SR 374 approximately one and a half miles (2.4 km) southwest of the hamlet of Gibisonville, and its northern terminus is at SR 180 nearly two and a half miles (4.0 km) northeast of Gibisonville. SR 678 provides a shorter alternative for traffic using SR 374 en route from Hocking Hills State Park up to U.S. Route 33 (US 33) at Rockbridge, in conjunction with SR 180.