Cisco is an unincorporated community in Placer County, California. Cisco is located on the Union Pacific Railroad, 0.5 miles south-southwest of Cisco Grove. It lies at an elevation of 5938 feet. The Cisco post office operated from 1866 to 1941. The name Cisco honors John J. Cisco, treasurer of the Central Pacific Railroad. The folk singer and songwriter Cisco Houston, who later befriended and toured extensively with Woody Guthrie, derived his nickname from Cisco, California.