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zipcodes.pro — AREA-CODE/628

628 area code

Area code 628 is in California. It covers San Francisco, San Rafael, Novato and 32 other places: 89 ZIP codes in San Francisco, Marin and San Mateo counties. Local time there is , Pacific Time. In service since 2015 as an overlay: it covers the same area as 415, so a number from there can have either code.

Time zone
Pacific
Largest city
San Francisco
Overlays
415
In service since
2015
Rate centres
14
Prefixes assigned
193 (1,930,000 numbers)

Who calls from a 628 number

NANPA records the carrier each block of 628 numbers is assigned to. Of the 1.9 million 628 numbers assigned, 66% are with cable, internet-calling, business and other carriers (Onvoy, Teleport Communications (AT&T) and Bandwidth); 33% with mobile carriers (T-Mobile, Verizon Wireless and AT&T Mobility).

That is who the numbers were assigned to: people keep their number when they change carrier, so any one number may have moved since.

Carriers holding the most 628 numbers
CarrierKindShare
OnvoyCable, VoIP, other29%
T-MobileMobile16%
Verizon WirelessMobile10%
Teleport Communications (AT&T)Cable, VoIP, other8%
BandwidthCable, VoIP, other8%
AT&T MobilityMobile6%

An area code says where a number was issued, not where the caller is: people keep their numbers when they move, and caller ID can be set to show any number, which the FCC calls spoofing. If a call you did not expect asks for money or personal details, the FCC advises hanging up and calling the company back on a number you look up yourself. Unwanted calls can be reported to the FTC at ReportFraud.ftc.gov.

Places in area code 628

The 10 places with a telephone rate centre of their own using 628, largest first. Each links to its ZIP codes.

Places in area code 628
PlaceZIP codesPopulation
San Francisco, CA 51 830,235
San Rafael, CA 5 60,433
Novato, CA 5 52,546
Mill Valley, CA 2 14,012
Corte Madera, CA 2 10,077
Sausalito, CA 2 7,141
Belvedere, CA — 2,345
Inverness, CA 1 1,346
Point Reyes Station, CA 1 517
Nicasio, CA 1 91

Nearby places using 628

These places have no rate centre of their own in NANPA's records; the nearest one uses 628. Near an area-code boundary that can be wrong for part of a town.

ZIP codes in area code 628

89 ZIP codes in 24 towns, by the town each is mailed to, largest first. Each links to its own page.

Where 628 numbers are issued

NANPA's rate centres with the most 628 prefixes (each prefix is 10,000 numbers), under NANPA's own abbreviated names.

Rate centres using area code 628
Rate centrePlacePrefixes
SNFC CNTRL San Francisco 76
SNFC MT-EV — 26
SAN RAFAEL San Rafael 17
SNFC JUNPR — 14
BELVEDERE Belvedere 10
CORTEMADRA Corte Madera 7

Counties

The counties of its ZIP codes, most residents first, with how many of its ZIP codes each has.

Which code covers where you are now? What area code am I in? answers from your location.

Questions about area code 628

Where is area code 628?

Area code 628 is in California. It covers San Francisco, San Rafael, Novato and 32 other places: 89 ZIP codes in San Francisco, Marin and San Mateo counties.

What ZIP codes are in area code 628?

89 ZIP codes, by the town each is mailed to: San Francisco (51, 94102 to 94188), San Rafael (5, 94901 to 94915), Novato (5, 94945 to 94998), Mill Valley (2, 94941 to 94942) and 20 more towns. The full list is on this page.

What time zone is area code 628 in?

Pacific time.

Is a 628 number a mobile or a landline?

It can be either. 33% of 628 numbers are assigned to mobile carriers and under 1% to local phone companies (NANPA, 2026-10-10); the rest are with cable, internet-calling, business and paging carriers. A number keeps its area code when it moves to another carrier.

What area codes overlay 628?

415. They cover the same area as 628, so a new number there can be given any of them.

Does a 628 number mean the caller is in California?

Not necessarily. An area code says where the number was first issued. People keep their numbers when they move or switch carriers, and calling software can show any number, so a 628 call can come from anywhere.

Other area codes in California

All 41 California area codes, by area, with the cities each covers

Source: NANPA NPA database, central office code and thousands-block assignments, 2026-10-10. Places are matched to NANPA's rate centres by name; see sources.

Cite this page

zipcodes.pro. “Area code 628.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/area-code/628

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