Illinois 255 starts at I-270 in Pontoon Beach and currently ends at Fosterburg Road in Alton, a distance of 13.7 miles (22.1 km).
Illinois 255 starts at I-270 in Pontoon Beach. Illinois 255 currently ends at Fosterburg Road in Alton. Alton is a distance of 13.7 miles (22.1 km).