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628 Area Code

Area code 628 serves San Francisco, San Rafael, Novato, Mill Valley, Larkspur and nearby communities in California. It has been in service since March 21, 2015, when it was split from 415.

StateCalifornia
Time zonePacific
Local time now…
Prefixes in use193
Overlay with415
Projected to run out2072
San FranciscoSan RafaelNovatoMill ValleyLarkspurSan AnselmoTamalpais-Homestead ValleyCorte MaderaTiburonFairfaxKentfieldSausalitoLucas Valley-MarinwoodStrawberrySan FranciscoSan RafaelNovato
Cities and towns served by area code 628

Who issues 628 numbers

Mobile 25%VoIP and cable 46%Landline 29%

Share of the 193 prefixes (the three digits after 628) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
Onvoy (Sinch)34
Fractel33
T-Mobile28
AT&T (Teleport)17
Bandwidth13
AT&T Mobility12
Verizon Wireless9
Peerless Network8

Cities and towns in area code 628

CityPopulationOther area codes
San Francisco826,079415
San Rafael59,410415
Novato51,947415
Mill Valley13,799415
Larkspur12,620415
San Anselmo12,555415
Tamalpais-Homestead Valley12,153415
Corte Madera9,929415
Tiburon8,881415
Fairfax7,417415
Kentfield7,128415
Sausalito7,019415
Lucas Valley-Marinwood6,331415
Strawberry5,496415

Got a call from 628?

A 628 number was originally issued in California, but that does not prove the caller is there. 46% of 628 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 193 prefixes in area code 628

Format: (628) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

Questions about area code 628

Where is area code 628?
Area code 628 is in California. It covers San Francisco, San Rafael, Novato, Mill Valley, Larkspur, San Anselmo and 8 more cities and towns.
What time zone is area code 628?
Area code 628 is in the Pacific time zone.
Is 628 a toll-free number?
No. 628 is a geographic area code in California. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Why does 628 share its area with 415?
415 and 628 form an overlay: they cover the same territory, so new numbers there can get any of these codes, and local calls need all 10 digits.
Will area code 628 run out of numbers?
NANPA's latest forecast projects the 415/628 overlay to exhaust in the fourth quarter of 2072. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in California