Indiana State Route 39 is a north-south highway in Central Clinton County. It runs from the Carroll/Clinton County Line, near Pince William, to the Boone/Clinton County Line, near Reagan. IN St Rt 39 passes throug the following towns in Clinton County. Rossville Frankfort
Antioch IN St Rt 39 is multi-plexed in Clinton County. U.S. Rt. 421, from the Carroll/Clinton County Line to Frankfort.
A junction marker on EB IN St Rt 38. A guide marker on EB IN St Rt 38. SB U.S. Rt. 421/IN St Rt 39 south of IN St Rt 38. SB U.S. Rt. 421/IN St Rt 39 near Kilmore Creek. SB U.S. Rt. 421/IN St Rt 39 south of Kilmore Creek. SB U.S. Rt. 421/IN St Rt 39 near 300N Road. SB U.S. Rt. 421/IN St Rt 39 near St. Luke Church. SB U.S. Rt. 421/IN St Rt 39 at the South Fork Wildcat Creek. SB U.S. Rt. 421/IN St Rt 39 south of the SouthFork Wildcat Creek. SB U.S. Rt. 421/IN St Rt 39 north of Frankfort. SB U.S. Rt. 421/IN St Rt 39 near Magnolia Ave. in Frankfort. SB U.S. Rt. 421/IN St Rt 39 near Railroad Street. SB U.S. Rt. 421/IN St Rt 39 west of Jackson St in Frankfort. SB U.S. Rt. 421/IN St Rt 39 south of Kyger St in Frankfort.