628 area code — San Francisco:central Da, CA geographic

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

If a call shows area code 628, the number was issued in the San Francisco:central Da area — a code active since 2015, on Pacific time. It is part of the 415/628 overlay complex — these codes share the same territory. Note that porting and VoIP mean a 628 number can be used from anywhere — the code marks where the number was assigned.

192 central-office prefixes are currently active in this code, spread across 34 code-holding carriers. Thousands-block pooling applies to 191 prefixes, so a single prefix can belong to several carriers. Its prefixes map to 14 distinct rate centers.

NANPA projects numbering capacity for the 415/628 complex to exhaust in 4Q 2072.

628 was created from 415 in 2015.

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

If a 628 call asks for money or personal data, treat the displayed number as unverified: hang up and reach the organization through its published number. Numbering data locates numbers, not callers.

Largest localities in 628

FAQ

Will 628 run out of numbers?

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

Why am I getting spam calls from 628 numbers?

Scammers spoof recognizable area codes so calls look local or familiar. A displayed 628 number does not prove the call originated there — see our guide to spotting spoofed calls.

Where is a 628 number from?

628 is assigned to San Francisco:central Da 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.