Ohio State Route 668 is a north-south highway across Perry County, barely protruding northward into Licking County and barely protruding southward into Hocking County. The northern end is at Brownsville, at US Route 40. Ohio Route 668 starts out toward the south, moving through an interchange with Interstate 70. It reaches Somerset and passes right through the center of town. Next, Ohio Route 668 heads south to join Ohio Route 37 for a short distance in Junction City. The southern end of Ohio Route 668 is at Ohio Route 93, northeast of Logan; most travelers on Ohio Route 668 continue south down Ohio Route 93 so they can reach Logan.
My photo for Ohio Route 668 comes from a junction with US Route 22 on the east side of Somerset. Bound for Somerset, Ohio Route 668 comes from the north to join US Route 22, on the east edge of town. Ohio Route 668 follows US Route 22 west through the center of town, continuing another two blocks to a left turn. The photo here shows a guide marker at the eastern junction between Ohio Route 668 and US Route 22; eastbound travelers use the guide marker shown to locate the northward turn of Ohio Route 668. This photo was taken in March 2021, during the tour of southeastern Ohio.