U.S. Federal Route 166 is a east-west highway in Sumner County. This runs in the southeastern part of the county. U.S. Rt. 166 runs from South Haven to Cowley County. U.S. Rt. 166 passes through the following town in Sumner County. South Haven U.S. Rt. 166 is not multi-plexed in Sumner County. U.S. Rt. 166 intersects the following highways in Sumner County. U.S. Rt. 81, at South Haven. U.S. Rt. 177, at South Haven. Interstate 35, near South Haven. Kansas Turnpike, near South Haven.
