U.S. Highway 77 (US-77) in Oklahoma is a 267.21-mile-long (430.03 km) U.S. Highway in the U.S. state of Oklahoma. It travels from south to north, paralleling Interstate 35 (I-35), connecting Texas to Kansas through the central part of the state. It travels through many major cities, including Ardmore, Oklahoma City and its suburbs, Guthrie, and Ponca City. It has four lettered spur routes.