State Road 26 is an east–west discontinuous state road in the central part of the US state of Indiana. The western end of the western segment is at the Illinois border, where it continues as Illinois Route 9. The highway passes through rural areas of Warren and Tippecanoe counties, before ending near West Lafayette. The eastern segment begins at an interchange with Interstate 65 (I-65) and heads east passing through the cities of Kokomo, Hartford City, and Portland, before ending at the Ohio border, where it continues east as Ohio State Route 119. The road covers a distance of about 150.1 miles (241.6 km), passing through mostly rural areas.

Illinois Route 9 is a 218.31-mile-long (351.34 km) cross-state, east–west rural state highway in the central part of the U.S. state of Illinois. It travels from Niota at the Fort Madison Toll Bridge, that crosses the Mississippi River into Iowa, eastward across central Illinois to State Road 26 at the Indiana state line.