Camp San Luis Obispo, formerly called Camp Merriam, was established in 1928 and is called the original home of the California National Guard. The camp is in San Luis Obispo County, which is on the Central Coast of California. State Route 1 passes through the camp about halfway between the cities of Morro Bay and San Luis Obispo. Since World War II, the camp has had an area of . The camp originally comprised , and a further was acquired during 1941. During World War II, the camp had quarters for 1,523 officers and 19,383 enlisted personnel.