U.S. Federal Route 421 is a north-south highway in Western Jasper County. It goes from the La Porte/Starke County Line, near Wilders, to the Pulaski/Starke County Line, near Radioville. This is the northern most county on U.S. Rt. 421 that is in the eastern time zone. U.S. Rt. 421 passes through the following town in Starke County. San Pierre