State Highway 53 (SH-53) is a 14.240-mile-long (22.917 km) state highway serving Kootenai County in the U.S. state of Idaho. SH-53 travels northeast from Washington State Route 290 at the Washington state border near Hauser to a short concurrency with SH-41 in Rathdrum. From Rathdrum, the highway continues east to end at U.S. Route 95 (US-95) north of Hayden. The Hauser to Rathdrum segment first appeared on a map in 1926, while the continuation of the route to the Hayden area appeared in 1937, completing an unnumbered state highway. SH-53 was designated in 1953 after all unnumbered state highways were assigned numbers.