Indiana State Route 28 runs east-west across Southern Warren County. It runs from Illinois State Route 119, near Hedrick, at the Illinois/Indiana State Line, to the Fontain/Warren County Line at the Wabash River. IN St Rt 28 passes through the following town in Warren County. Williamsport
IN St Rt 28 is multi-plexed in Warren County U.S. Rt. 41, near Williamsport.