Clarendon is a city in Donley County, Texas, United States. The population was 1,974 at the 2000 census. The county seat of Donley County, Clarendon is located on United States Highway 287 in the Texas Panhandle some sixty miles east of Amarillo. It was established in 1878 by Methodist clergyman L.H. Carhart as a "sobriety settlement" in contrast to typical boom towns of that era. It acquired the sobriquet "Saints Roost" from local cowboys: hence the unusual name of the Clarendon museum, the Saints' Roost Museum.