Area code 818 is a California telephone area code that consists largely of the San Fernando Valley of Los Angeles, California. It was split from area code 213 on January 7, 1984. On June 14, 1997, area code 818 was split again, with area code 626 having been created for most of the San Gabriel Valley. Area code 747 is an overlay of 818 that became effective on May 18, 2009.