Santa Monica, CA utilizes an area code overlay in which area codes 310 and 424 serve the same geographic area. The area code overlay was established in 2006 at which time area code 424 was created as an overlay of area code 310. Area code 310 was created from a split of area code 213 and put into service on November 2, 1991. Ten digit dialing (area code + seven digit number) is necessary because two different homes in the same geographic area can have the same seven digit phone number but each would have a different area code.
In addition to Santa Monica, CA area codes 310 and 424 serve the larger communities of Beverly Hills, Carson, Catalina, Inglewood, Long Beach, Malibu, Marina del Rey, Santa Monica, Torrance, and includes the southwestern portions of Los Angeles County.
Santa Monica, CA is located in Los Angeles County and observes the Pacific Time Zone. View our Times by Area Code tool.