Tennessee State Route 120State Route 120 is a north–south secondary state highway located entirely in Stewart County in northwestern Middle Tennessee.Route descriptionSR 120 starts at a junction with U.S. [Route 79 in Tennessee|US 79]/Tennessee [State Route 76|SR 76] near Big Rock. The highway goes north for a short distance before turning west to pass along the north side of Big Rock. SR 120 then winds its way southwest before turning north again to pass through Bumpus [Mills, Tennessee|Bumpus Mills] before coming to an end at the Kentucky state line, where it continues as Kentucky Route 139 upon entry into Trigg County, Kentucky.Major intersections