California · Pacific Time
Santa Monica, CA Area Codes
Santa Monica is served by 2 area codes (310, 424). Here's which is original, which are overlays, and how to pick one for a new local number.
Last updated October 3, 2026 · Source: NANPA
Area codes serving Santa Monica
Santa Monica sits in California, part of the West region and the Pacific Time zone. Its numbers are spread across an overlay of 2 codes that all cover the same ground: 310, 424.
The original code is 310 (in service since 1991). As the area ran low on numbers, regulators added overlay codes on top instead of splitting the city, so longtime residents kept their numbers while new lines received a newer code.
| Code | Area served | In service |
|---|---|---|
| 310 | West Los Angeles, the Westside, beach cities and South Bay of Los Angeles County | November 2, 1991 |
| 424 | West Los Angeles, the Westside, beach cities and South Bay of Los Angeles County | August 26, 2006 |
Nearby cities sharing these area codes
- Los Angeles
- Torrance
- Inglewood
- Carson
- Compton
- Hawthorne
- Redondo Beach
- Gardena
- Culver City
- Beverly Hills
- Manhattan Beach
- Malibu
How to pick an area code for a new number
When you activate a new line in Santa Monica, the carrier assigns whichever code has numbers available — you usually can't choose. If a specific code matters to you (for example the prestige of 310), ask the carrier whether any blocks remain, or request a number transfer. All codes here dial identically and cost the same.
Dialing in Santa Monica
Because Santa Monica is an overlay area, 10-digit dialing is mandatory: always dial the area code plus the seven-digit number, even for a neighbor. From outside the US, dial +1, then the area code and number. See 10-digit dialing and overlay area codes for the background. For every code in California, visit the California area codes page.
Quick answers
Santa Monica area code FAQ
What area codes does Santa Monica use?
Santa Monica, CA is served by 2 area codes: 310, 424.
Which is the original Santa Monica area code?
310 is the original code for Santa Monica, in service since 1991; the others were added later for more numbers.
What time zone is Santa Monica in?
Santa Monica is in the Pacific Time zone.
Do I need to dial the area code in Santa Monica?
Yes. With multiple overlapping codes, 10-digit dialing is required for every call in this area.