310 is an in-service United States area code assigned to California. It identifies a numbering region, not a caller’s current location.
NANPA assigns 310 to California. California’s public utility commission describes the 310 numbering area as including communities such as Beverly Hills, Santa Monica, and parts of west Los Angeles. The 424 code is an overlay of 310. Browse other codes in California
Additional area detail: California Public Utilities Commission.
View the official area-code maps ↗. Maps show numbering areas, not a caller’s location.
NANPA lists Pacific for this numbering area. These are numbering-region time zones, not a caller’s current location.
An area code can span more than one time zone. Local daylight-saving rules may differ.
The NANPA source lists 424 in the same overlay complex. An overlay can serve the same broad numbering area; individual numbers still do not prove where a person is.
Use the North American country calling code +1 followed by the three-digit area code and seven-digit local number. For example, write the pattern as +1 310 XXX XXXX. Local dialing rules and charges depend on your location and provider. Check a supported dialing format or check NANPA’s 10-digit dialing list.
NANPA’s US report listed 786 assigned prefixes on 2026-09-29. These are code assignments, not a count of active phone numbers or proof of a caller’s current carrier. Search any US area code and prefix.
| Rate center | Assigned prefixes |
|---|---|
| CMTN GRDN | 124 |
| BEVERLYHLS | 113 |
| SNMN SNMN | 84 |
| W ANGELES | 69 |
| SNMN MRVS | 54 |
| Assignment company | Assigned prefixes |
|---|---|
| PACIFIC BELL | 249 |
| FRONTIER CALIFORNIA INC. | 137 |
| NEW CINGULAR WIRELESS PCS, LLC | 68 |
| T-MOBILE USA, INC. | 58 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 56 |
786 assigned prefixes are listed for this area code. Search NANPA’s US central-office code assignments. The listed company and rate center describe an assignment; number portability means they cannot identify the current carrier, subscriber, or caller.
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The displayed number may be spoofed. Do not rely on an area code as proof of caller identity. If the caller claims to represent a business, end the call and contact that business using a number you found independently.
Area code 310 serves western Los Angeles County, California, including Beverly Hills, Santa Monica, Culver City, Malibu, Torrance, and Inglewood.
310 is assigned to California, and the NANPA record associates it with Pacific time. A phone number does not reveal its owner’s current time zone. The clock above uses a representative time zone for the numbering area.
No. An area code is an assignment, and a person can travel, move, use internet calling, or display a spoofed number.
No. OfficialAreaCode has no live subscriber directory or spam-report database.