SR 156 begins at an intersection with SR 17 in Jachin. Here, the roadway continues as ChoctawCountyRoute 32. The highway travels to the southeast and curves to the east. In Robjohn, it intersects the southern terminus of Choctaw CR 35. SR 156 crosses over Mill Creek and Deas Branch. It travels through Choctaw City and then intersects Choctaw CR 37. The highway curves to the east-northeast and crosses over Campbell Branch. After a crossing of Threemile Branch, it curves to the east-southeast and enters Pennington. At the southern terminus of Choctaw CR 33, SR 156 turns right and travels due south. It crosses over some railroad tracks of M&B Railroad just before it reaches its eastern terminus, an intersection with SR 114.