San Clemente Island or SCI is the southernmost of the Channel Islands of California. It is owned and operated by the United States Navy,[1] and is a part of Los Angeles County. Defined by the United States Census Bureau as Block Group 2 of Census Tract 5991 of Los Angeles County, California, it is 21 nautical miles (39 km) long and contains 147.13 km2 (56.81 sq mi) of land. The island is officially uninhabited as of 2000 U.S. Census.