The area code 310 is located in Los Angeles, California.
Area code 310 serves the western and southwestern parts of Los Angeles County in Southern California, covering the Westside and South Bay along the Pacific coast. Established in 1991 after a split from 213, it later received an overlay with area code 424, so 10‑digit dialing is required for all local calls. The 310 region includes the mainland coast and Santa Catalina Island, and in 1997 its southeastern section became area code 562. This area code is known for busy business districts, beach cities, and major cultural landmarks, making it one of the most recognized phone prefixes in the region.
Key cities and landmarks in area code 310 include:
Area code 310 is central to daily life in Los Angeles, linking coastal neighborhoods, universities, and major employers across the Pacific Time zone. Many new numbers in this area are assigned the 424 overlay, but long‑time residents and businesses still use legacy 310 phone numbers. The mix of tech, media, and tourism hubs—stretching from Beverly Hills to the South Bay—means phone traffic here is constant year‑round. If you see a 310 number, it most likely connects to the Westside or South Bay communities of Los Angeles County.
"Area code 310 was created in 1991 in a split from 213." — North American Numbering Plan Administrator (NANPA)