🇺🇸 628 area code
Area code 628 covers San Francisco, San Rafael, Novato and Mill Valley and the surrounding area in California. It shares that territory with 415, so the same neighbourhood can have numbers in any of them. Enter a 628 number below for a free check before you call back.
- Location: San Francisco, California
- Time zone: Pacific (UTC−8)
- In service since March 21, 2015
Consultar un número
Validez, operador, tipo de línea y región en la primera pasada.
Area code 628 at a glance
- Area code
- 628
- Location
- California, United States
- Main cities
- San Francisco, San Rafael, Novato, Mill Valley, Sausalito, Corte Madera
- Time zone
- Pacific (UTC−8)
- Local time now
- —
- In service since
- March 21, 2015
- Created from
- 415
- Overlay codes
- 415
- Local calls
- Dial 1 + 10 digits
- Number format
- (628) 555-0123
- From abroad
- +1 628 555 0123
Cities in the 628 overlay area
- San Francisco
- San Rafael
- Novato
- Mill Valley
- Sausalito
- Corte Madera
- Bolinas
- Greenbrae
Is a 628 call a scam?
An area code tells you where a number was first assigned, not where the caller is. Mobile numbers keep their area code when people move, and internet (VoIP) numbers can be picked in any area code — so a 628 number can be calling from anywhere.
Robocallers exploit that with "neighbor spoofing": showing a 628 number to people in California because a local-looking call is more likely to be answered. If a 628 call claims to be your bank, the IRS or a delivery company, hang up and call the official number yourself.
About area code 628
628 entered service on March 21, 2015, as an overlay on 415, which had run short of numbers.
It is part of the 415/628 overlay: the codes cover the same area, and a new line there can be given a number in any of them. Two neighbours — or two phones in one household — can have different area codes. That is also why local calls need the full ten digits.
Because 628 overlays the same ground, the cities listed are those of the codes it shares with.
Preguntas frecuentes
Area code 628 questions
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.
Where is area code 628?
Area code 628 is in California, United States. It covers San Francisco, San Rafael, Novato, Mill Valley, Sausalito and Corte Madera.
What time zone is area code 628?
628 is in the Pacific (UTC−8) time zone, and observes daylight saving time.
What area codes overlay 628?
415 serves the same area as 628. Numbers in all of them are local to one another.
When did area code 628 start?
628 entered service on March 21, 2015, created from 415.
How do I find out who called me from 628?
Enter the full number in the lookup at the top of this page. The free check confirms whether the number is valid and shows its carrier, line type and region; a full report adds owner and public-web records where they are available.
Why am I getting calls from area code 628?
If you live in or near California, they may be genuinely local — or robocalls spoofing a local-looking number. Unknown 628 callers who will not leave a message are best looked up before you call back.
Got a call from 628?
Run the free check first — validity, carrier, line type and region — and unlock the full report only if you need it.