Ohio State Route 73 is a east-west highway across Northern Warren County. This runs from Carlsile to Harveysburg, via Waynesville, and the Caesar Creek State Wildlife Area. OH St Rt 73 passes through the following towns in Warren County. Carlisle Springboro Waynesville Harveysburg OH St Rt 73 is multi-plexed in Warren County. Ohio State Route 123, at Carlisle. OH St Rt 73 intersects the following highways in Warren County. Ohio State Route 123, at Carlisle. Ohio State Route 123, at Carlisle. Interstate 75, at Springboro. Ohio State Route 741, at Springboro. Ohio State Route 48, near Ridgeville. U.S. Rt. 42, at Waynesville.
