State Highway 325, officially, SH-325, is a state highway in the U.S. state of Oklahoma. SH-325 runs for 38.08 miles (61.28 km) through Cimarron County, Oklahoma, from a continuation of New Mexico State Road 456 at the New Mexico border west of Kenton to the traffic circle in Boise City. Along the way it provides access to Black Mesa State Park, near Black Mesa, the highest point in the state of Oklahoma.