State Route 185 is an east to west secondary highway in Gibson County, Tennessee that is 7.67 miles (12.3 km) long. Its western terminus is in Dyer, Tennessee at the junction with U.S. Route 45W. Its eastern terminus is just outside of Bradford at TN 54. East of Dyer the highway is also called Poplar Grove Road.The original western terminus was in Dyer at the intersection of Main Street (then US 45W) and Poplar Grove Road.