Area codes in Folsom, California

Folsom, California uses 2 area codes — 916 and 279. The main Folsom area code is 916.

Area codes serving Folsom

Phone numbers in Folsom are written as ten digits — for example (916) 555-0190 — and fall in the Pacific Time zone.

How Folsom came to have 2 area codes

The original Folsom area code is 916, in service since 1947. As the area ran low on available numbers, an overlay code was added over the same region for new phone lines: 279 (2018). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why Folsom 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 Folsom?

The main area code for Folsom, California is 916. Folsom is now served by 2 area codes in total: 916, 279.

How many area codes does Folsom have?

Folsom has 2 area codes: 916, 279.

Why does Folsom have more than one area code?

As Folsom used up the numbers available in its original area code (916, in service since 1947), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.

How do you dial a Folsom number?

Dial all 10 digits — the area code (916 or 279) 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.