Interstate 235 (abbreviated I-235) in Oklahoma is also known as the Centennial Expressway. The spur route of Interstate 35 is a 5.4-mile-long north–south spur route in central and north-central Oklahoma City. It connects northbound to U.S. Highway 77 on to suburban Edmond and southbound at Interstate 44 on to Interstate 35 and Interstate 40 at downtown Oklahoma City. U.S. Highway 77 is concurrent with I-235 for the entire route. South of its junction with I-40, I-235 becomes Interstate 35.