High Quality Content by WIKIPEDIA articles! State Highway 5 (SH-5 or OK-5) is the name assigned to two distinct state highways in the U.S state of Oklahoma. One runs for 21 miles (33.6 km) through extreme southwestern Oklahoma, passing through Harmon and Jackson Counties. The other is 98 miles (158 km) long and runs through southwest Oklahoma, connecting US-283 south of Altus to US-70 at Waurika.