Area codes in Santa Monica, California

Santa Monica, California uses 2 area codes — 310 and 424. The main Santa Monica area code is 310.

Area codes serving Santa Monica

Phone numbers in Santa Monica are written as ten digits — for example (310) 555-0190 — and fall in the Pacific Time zone.

How Santa Monica came to have 2 area codes

The original Santa Monica area code is 310, in service since 1991. As the area ran low on available numbers, an overlay code was added over the same region for new phone lines: 424 (2006). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why Santa Monica now uses all 2 codes and every local call is dialed with ten digits.

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Nearby cities

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Frequently asked questions

What is the area code for Santa Monica?

The main area code for Santa Monica, California is 310. Santa Monica is now served by 2 area codes in total: 310, 424.

How many area codes does Santa Monica have?

Santa Monica has 2 area codes: 310, 424.

Why does Santa Monica have more than one area code?

As Santa Monica used up the numbers available in its original area code (310, in service since 1991), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.

How do you dial a Santa Monica number?

Dial all 10 digits — the area code (310 or 424) followed by the 7-digit local number. From abroad, dial +1, then the area code and number.

Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.