357 area code — California geographic

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

Phone numbers beginning 357 are registered in California (Pacific time zone). The code entered service on March 26, 2025. It is part of the 357/559 overlay complex — these codes share the same territory. Note that porting and VoIP mean a 357 number can be used from anywhere — the code marks where the number was assigned.

357 was created from 559 in 2025.

Practical takeaway: the 357 label narrows geography to California, the prefix narrows it to a locality, and neither authenticates a caller. Verification means calling back through a number you found yourself.

NANPA projects numbering capacity for the 357/559 complex to exhaust in 4Q 2072.

Dialing: 1+10D locally, 1+10D to other codes (10-digit dialing permissible at wireless providers discretion).

FAQ

Will 357 run out of numbers?

NANPA's current forecast projects exhaust in 4Q 2072 — decades of capacity remain.

Why am I getting spam calls from 357 numbers?

Scammers spoof real area codes so calls look legitimate. A displayed 357 number does not prove the call originated there — see our guide to spotting spoofed calls.

Where is a 357 number from?

357 is assigned to California in the Pacific time zone. The three digits after the area code (the prefix) narrow it down to a rate center.

Is 357 a toll-free number?

No. 357 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.