Area code 310: California
Area code 310 is a US state area code for California, on Pacific Time. It has 786 prefixes in service across 17 rate centers, the largest being Compton:Gardena Da, Beverly Hills and Santa Monica:Santa Monica Da. It shares its area with 424, so local numbers there can start with any of them. Local calls there take 1 + 10 digits.
Local time in area code 310
America/Los_Angeles
Prefixes in service
786 of 792 possible
17 rate centers
Area code 310 facts
| Location | California, United States |
|---|---|
| Time zone | Pacific Time |
| Overlays | 424 |
| Split from | 213 |
| In service since | November 2, 1991 |
| Local calls | 1 + 10 digits |
| Carrier | Not shown. An area code is where a number was issued; numbers port between carriers. Check line type |
Which cities and towns use area code 310?
NANPA records each prefix against a rate center, the local billing area a number belongs to, usually named after its main town. These are the 310 rate centers with the most prefixes in service. 5 smaller ones aren't listed.
| Rate center | Prefixes |
|---|---|
| Compton:Gardena Da | 124 |
| Beverly Hills | 113 |
| Santa Monica:Santa Monica Da | 84 |
| West Los Angeles | 69 |
| Santa Monica:Mar Vista Da | 54 |
| Inglewood | 49 |
| Redondo | 44 |
| Compton:Compton Da | 44 |
| El Segundo | 39 |
| Culver City | 36 |
| San Pedro | 35 |
| Torrance | 33 |
Source: NANPA central office code assignments, file dated 10/17/2026. Each prefix holds up to 10,000 numbers.
How do I dial a 310 number?
NANPA's dialling plan for 310: local calls inside the code take 1 + 10 digits, toll calls 1 + 10 digits. From another area code, dial 1 first. From abroad, use +1. The examples use 555-0147, from a range reserved for fictional numbers.
| Local call inside 310 | 1-310-555-0147 |
|---|---|
| From another US or Canadian area code | 1-310-555-0147 |
| From outside North America | +1 310 555 0147 |
| E.164, for CRMs and SMS tools | +13105550147 |
When did area code 310 start?
Area code 310 went into service on November 2, 1991, split from 213. Today 310 and 424 cover the same area as an overlay, which is why 10-digit dialling is needed for local calls there.
Tools for 310 numbers
- Area code lookup
Look up any code or a whole list of numbers, or find the codes for a state or city.
- Area code time zone
Local time for a list of numbers, with a callable-now flag.
- NPA-NXX lookup
Rate center and state for one prefix, a level below the area code.
- TCPA calling hours checker
Whether it's inside the federal 8 a.m. to 9 p.m. calling window there now.
Next step
A 310 number tells you where it was issued, not what it is now.
Mobiles, landlines and VoIP lines share area codes, and numbers move between carriers. A live line-type and carrier lookup on every number in your list says which is which, and that decides which calling and texting rules apply. It's in the Email + Phone plan.
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Area code 310 questions
- What state is area code 310?
- Area code 310 is in California, United States. Its largest rate centers by number of prefixes are Compton:Gardena Da, Beverly Hills, Santa Monica:Santa Monica Da, West Los Angeles and Santa Monica:Mar Vista Da.
- What time zone is area code 310 in?
- Pacific Time.
- What area codes overlay 310?
- 424. An overlay adds a new code to the same area instead of splitting it, so neighbours can have different area codes and local calls need 10 digits.
- When did area code 310 start?
- Area code 310 went into service on November 2, 1991, split from 213.
- Is a 310 number a cell phone or a landline?
- The area code can't tell you. In the US and Canada mobiles, landlines and VoIP lines share area codes and prefixes, and numbers move between carriers and line types. Only a live line-type lookup answers it for one number.
- How many phone numbers does area code 310 have?
- 786 of its 792 possible prefixes are in service, and each prefix holds up to 10,000 numbers. That counts prefixes assigned to carriers, not numbers in use.
Other area codes in California
209213279323341350357369408415424442510530559562619626628650657661669707714738747760805818820831837840858909916925949951
Sources
Location, overlays, in-service date and dialling plan: NANPA NPA database, file dated 10/16/2026. Prefixes and rate centers: NANPA central office code assignments, 10/17/2026. Time zones mapped to the IANA time zone database. By the SimpleVerifier Team; how we build these pages.