Direct answer
Area code 310 serves the Westside and South Bay of Los Angeles County, a small part of Ventura County, and Santa Catalina Island in California. It is in the Pacific Time, and ten-digit dialing is required there.
Facts
| Area code | 310 |
| State | California (CA) |
| Region | the Westside and South Bay of Los Angeles County, a small part of Ventura County, and Santa Catalina Island |
| Time zone | Pacific Time |
| Overlays | 310/424 |
| In service since | 2 November 1991 (split from 213) |
| Dialing rule | Yes — ten-digit dialing is required in this overlay area. |
Areas covered
The 310 footprint covers Beverly Hills, Santa Monica, Malibu, Venice, Culver City, Manhattan Beach, Redondo Beach, Torrance, San Pedro, Westwood, and Brentwood. That list describes the area the code serves today, not the larger territory it may have covered when it was first assigned. California is entirely in the Pacific Time Zone for this footprint. Callers in this area should always dial the full ten-digit number, including the area code, even for a local call.
History
Area code 310 was created on 2 November 1991 as a split from 213. It later lost its south-eastern edge, including Long Beach and the Gateway Cities, to area code 562 in January 1997. Area code 424 was then added as an overlay, and NANPA records 424 in service on 26 August 2006, settling an earlier claim of 26 July 2006. The overlay means new numbers in the same Westside and South Bay territory can carry either 310 or 424.
Dialing
Dialing rule: Yes — ten-digit dialing is required in this overlay area. The reason is the overlay structure in the facts table above, except where this page states a different reason, as it does for 616. From outside the United States, the country code for the United States is 1, followed by the area code and the local number. This page explains the area code only; it does not identify who owns a number or where a phone is.
Calls and spoofing
A call that shows a familiar area code is not proof of who is calling. Caller ID can be spoofed, so a number that looks local may come from anywhere. Do not share personal or financial details because of the number on the screen, and hang up and call back on a number you trust if a caller asks for money, codes, or account access. This site does not identify callers or phone owners, and it does not list reported spam numbers.
Related codes
424 (overlay); 213 (Batch 1, parent code and also Los Angeles County).
Frequently asked questions
Where is 310 area code?
Area code 310 is in California, covering the Westside and South Bay of Los Angeles County, a small part of Ventura County, and Santa Catalina Island. It does not cover the whole state.
What time zone is 310 area code?
Area code 310 is in the Pacific Time. California is entirely in the Pacific Time Zone for this footprint.
What area codes overlay 310?
The overlay codes for 310 are 424. The full overlay group is 310/424. New numbers in the same territory can carry any code in the group.
Is 310 area code a scam?
No area code is itself a scam. Scammers can spoof any area code, including this one, so judge a call by what the caller asks for, not by the number shown. This site does not identify callers.
When did 310 area code go into service?
Area code 310 has been in service since 2 November 1991 (split from 213).
Sources
NANPA area code search; Area codes 310 and 424
Based on a recent search of NANPA and official sources.
This website provides general information about North American area codes, compiled from public sources including NANPA. It is not affiliated with or endorsed by the FCC, NANPA or any telephone carrier. Area code details can change; confirm with your carrier or the official NANPA website. This site does not identify callers or phone owners.