310 area code
Compton area, Pacific Time.Area code 310 covers Compton, Santa Monica, Beverly Hills and 11 more places in California, on Pacific Time. 424 covers the same area.
Right now in Compton
Pacific Time (PST, UTC-8; PDT, UTC-7 in summer)
Calling hours: Every day, 8 AM to 9 PM (the federal rule)
Small talk
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Where 310 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 310 has 14. Each one's share is how many 310 numbers start there. Its biggest metro area is Los Angeles-Long Beach-Anaheim, CA.
- Compton21%
- Santa Monica18%
- Beverly Hills14%
- West Los Angeles9%
- Inglewood6%
- Redondo6%
- El Segundo5%
- Culver City5%
- San Pedro4%
- Torrance4%
- Hawthorne4%
Also: Lomita, Malibu, Avalon
Share of exchanges (blocks of 10,000 numbers). Source: NANPA rate center and exchange reports, November 10, 2026
When can you call a 310 number?
Sales calls to homes and cell phones have legal hours, set by the federal rule. Hold every 310 number to them, since you can't tell a work line from a personal cell.
What applies to 310Every day, 8 AM to 9 PM
- Federal (TCPA and FTC rule)Every day, 8 AM to 9 PMCalls to residential and mobile numbers. Most calls to businesses are exempt from the FTC's rule.47 CFR 64.1200(c)(1); 16 CFR 310.4(c) (opens in a new tab)
Local time comes from the area code, not from where the person is today. Mobiles keep their number when they move. Calling hours here are a guide, not legal advice. Every state's calling hours, with sources
310 and 424
310 went into service on November 2, 1991, split off from 213, and 562 was later split off from it. 310 and 424 cover the same area, so new numbers can get either code and neighbors can have different area codes. 310 holds 63% of the area's exchanges; 424 holds the rest. Local calls take all 10 digits.
- 1991310 starts
- 1997562 split off
- 2006424 overlay
Source: NANPA area code database
Other California area codes
All California area codes- Stockton209350
- Los Angeles213323738
- Sacramento279916
- Oakland341510
- Fresno357559
- Santa Rosa369707
- San Jose408669
- San Francisco415628
- Oceanside442760
- Chico530837
- Long Beach562
- San Diego619858
- Alhambra626
- Palo Alto650
- Anaheim657714
- Bakersfield661
- Van Nuys747818
- Santa Barbara805820
- Salinas831
- Ontario840909
- Walnut Creek925
- Irvine949
- Riverside951
Calling a list of 310 numbers?
Paste it into the free phone number validator. It checks every number, finds each one's time zone and sorts the list by who you can call right now.
310 area code FAQ
What area code is 310?
310 is a California area code for Compton, Santa Monica, Beverly Hills, West Los Angeles and 10 more places.
What time zone is the 310 area code in?
Pacific Time (PST, UTC-8; PDT, UTC-7 in summer).
Is 424 the same as 310?
Same area, different code. 310 and 424 cover the same area (an overlay), so new numbers can get any of them and local calls take all 10 digits.
What are the calling hours for 310 numbers?
Every day, 8 AM to 9 PM, local time, under the federal rule.
When did the 310 area code start?
On November 2, 1991. It was split from 213.
Calling 310 numbers? Reach more of them.
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