California · Pacific Time
310 Area Code
Area code 310 is in California, serving west Los Angeles, the Westside, beach cities and South Bay of Los Angeles County. It is in the Pacific Time zone. It shares its territory with overlay code 424, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 310 area code?
310 is a California area code covering west Los Angeles, the Westside, beach cities and South Bay of Los Angeles County. In the wider directory it sits in the West region.
Cities in the 310 area code
- Los Angeles
- Torrance
- Santa Monica
- Inglewood
- Carson
- Compton
- Hawthorne
- Redondo Beach
- Gardena
- Culver City
- Beverly Hills
- Manhattan Beach
- Malibu
Counties served by 310
Los Angeles County.
310 overlay codes and dialing
The 310 territory is covered by an overlay of 2 area codes: 310, 424. All of them serve the same geographic area, and the original code is 310. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 310 area code
310 went into service on November 2, 1991, created when it was split from 213. It serves Los Angeles and the surrounding part of California, and today shares its territory with overlay code 424. For how codes are created, split, and overlaid, see how area codes work.
Is 310 a scam or spam risk?
310 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 310 number on your screen is no guarantee the caller is in Los Angeles, CA or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other California area codes
Explore more
See every code in California, compare codes across the West region, or view all Pacific Time codes. You can also browse the 3XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
310 area code FAQ
Where is the 310 area code?
The 310 area code is in California, covering west Los Angeles, the Westside, beach cities and South Bay of Los Angeles County, in the West region.
What cities are in the 310 area code?
Cities in the 310 area code include Los Angeles, Torrance, Santa Monica, Inglewood, Carson, Compton, Hawthorne, Redondo Beach, Gardena and Culver City.
What time zone is 310 in?
310 is in the Pacific Time zone.
What is the overlay for the 310 area code?
310 shares its territory with 424. Both codes (310, 424) serve the same area, so 10-digit dialing is required for every call.
When did the 310 area code start?
310 went into service on November 2, 1991.
Do I have to dial 10 digits for 310?
Yes. Because 310 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 310 a toll-free or premium code?
No. 310 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.