Tulelake is a city in northeastern Siskiyou County, California, United States, at an elevation of 4,066 feet above sea level. The town is named after nearby Tule Lake. The population was 1,010 at the 2010 census, down from 1,020 at the 2000 census.
Tulelake peace officers are authorized by state law, along with cooperation of the state of Oregon, to serve as and be recognized as peace officers within Malin, Oregon, along with the inverse being true for peace officers employed within Malin, wherein they are recognized as peace officers within Tulelake by the California Penal Code.