Area codes in Eureka, California
Eureka, California uses 2 area codes — 707 and 369. The main Eureka area code is 707.
Area codes serving Eureka
Phone numbers in Eureka are written as ten digits — for example (707) 555-0190 — and fall in the Pacific Time zone.
How Eureka came to have 2 area codes
The original Eureka 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 Eureka now uses all 2 codes and every local call is dialed with ten digits.
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Frequently asked questions
What is the area code for Eureka?
The main area code for Eureka, California is 707. Eureka is now served by 2 area codes in total: 707, 369.
How many area codes does Eureka have?
Eureka has 2 area codes: 707, 369.
Why does Eureka have more than one area code?
As Eureka 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 Eureka 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.