Ohio State Route 209 is a east-west highway in West-Central Guernsey County. This runs from Byesville to the Muskingum/Guernsey County Line. OH St Rt 209 passes through the following tonws in Guernsey County. Byesville Cambridge OH St Rt 209 is not multi-plexed in Guernsey County. OH St Rt 209 intersects the following highways in Gernsey County. Interstate 77, at Byesville. Ohio State Route 821, at Byesville. Ohio State Route 660, near Byesville. Interstate 70, at Cambridge. U.S. Rt. 22, at Cambridge. U.S. Rt. 40, at Cambridge. Ohio State Route 658, near Cambridge. Ohio State Route 662, near Bloomfield.