Area codes in Fairfield, California
Fairfield, California uses 2 area codes — 707 and 369. The main Fairfield area code is 707.
Area codes serving Fairfield
Phone numbers in Fairfield are written as ten digits — for example (707) 555-0190 — and fall in the Pacific Time zone.
How Fairfield came to have 2 area codes
The original Fairfield area code is 707, in service since 1959. As the area ran low on available numbers, an overlay code was added over the same region for new phone lines: 369 (2023). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why Fairfield now uses all 2 codes and every local call is dialed with ten digits.
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More cities in California
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Frequently asked questions
What is the area code for Fairfield?
The main area code for Fairfield, California is 707. Fairfield is now served by 2 area codes in total: 707, 369.
How many area codes does Fairfield have?
Fairfield has 2 area codes: 707, 369.
Why does Fairfield have more than one area code?
As Fairfield used up the numbers available in its original area code (707, in service since 1959), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a Fairfield number?
Dial all 10 digits — the area code (707 or 369) 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.