350 area code — Modesto, CA geographic

Data: NANPA public reports, current as of July 28, 2026.

Area code 350 is a geographic code serving Modesto, California in the Pacific time zone. It has been in service since November 28, 2022. It is part of the 209/350 overlay complex — these codes share the same territory. Note that porting and VoIP mean a 350 number can be used from anywhere — the code marks where the number was assigned.

78 central-office prefixes are currently active in this code, spread across 16 code-holding carriers. Thousands-block pooling applies to 78 prefixes, so a single prefix can belong to several carriers. Its prefixes map to 40 distinct rate centers.

350 was created from 209 in 2022.

NANPA projects numbering capacity for the 209/350 complex to exhaust in 1Q 2056.

Dialing: 1+10D locally, 1+10D to other codes.

To check where a specific 350 number was issued, look up its six-digit prefix; to check who is actually calling, ignore the display and verify through an official callback number — caller ID is assertable and routinely spoofed.

Largest localities in 350

FAQ

Will 350 run out of numbers?

NANPA's current forecast projects exhaust in 1Q 2056 — decades of capacity remain.

Why am I getting spam calls from 350 numbers?

Scammers spoof recognizable area codes so calls look local or familiar. A displayed 350 number does not prove the call originated there — see our guide to spotting spoofed calls.

Where is a 350 number from?

350 is assigned to Modesto and surrounding areas of California in the Pacific time zone. The three digits after the area code (the prefix) narrow it down to a rate center.