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US area code · California

628 area code

Where the 628 area code is, its overlay and how to dial a +1 628 number from anywhere.

CoversSan Francisco, CaliforniaTime zonePacific (PT)TypeOverlay
Quick answer

The 628 area code is in San Francisco, California, United States (Pacific (PT)). To call from abroad: +1 628 555-0123. It is an overlay, so all 10 digits are dialled.

StateCalifornia
Main areaSan Francisco
Time zonePacific (PT)
TypeOverlay
10-digit dialingRequired
In service since19-Dec-2013

The 628 area code is a geographic North American Numbering Plan (NANP) code covering San Francisco, California. It has been in service since 19-Dec-2013 and sits in the Pacific (PT) time zone.

Overlay 628 shares its region

Several area codes cover the same geographic area, so two neighbours can have different codes. Because of the overlay, you must dial all 10 digits (area code + number) even for local calls.

628415

How to dial a 628 number

From abroad+1 628 555-0123
Within the US / Canada1 628 555-0123
Locally (same area)628 555-0123

Cities in the 628 area code

A 628 number is usually in one of these places in California — 2 counties.

Novato MarinSan Anselmo MarinSan Rafael MarinSouth San Francisco San Mateo

Other California area codes

209213279310323341350357369408415424442510530559

Frequently asked questions

Where is the 628 area code?

The 628 area code is in San Francisco, California, United States (Pacific (PT)).

Is 628 an overlay area code?

Yes. 628 overlays the same region as 415, so callers dial all 10 digits.

Do I have to dial 10 digits for 628?

Yes — dial the area code plus the seven-digit number.

How do I call a 628 number from another country?

Dial your exit code (or +), then 1, then 628, then the number: +1 628 555-0123.

Source: NANPA numbering plan. An area code covers a region, not a precise address — a 628 number does not pinpoint a street or ZIP code.

Number holders in area code 628

Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 208 prefixes are in use in 628, shared by 35 companies. The largest holders:

CompanyPrefixesShare
Fractel, LLC3316%
Onvoy, LLC3215%
T-Mobile USA, Inc.2813%
Teleport Communications America, LLC178%
Bandwidth.Com CLEC, LLC136%
New Cingular Wireless PCS, LLC126%

Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.

Complaints about 628 numbers

Reports to the FTC, last 30 days
280
Recorded messages or robocalls
57%
Rank among area codes
#297 of 670
Most reported subjects
Other (121)
Calls pretending to be government, businesses, or family and friends (59)
Reducing your debt (credit cards, mortgage, student loans) (47)

Period Aug 26 – Sep 24, 2026. These are the numbers shown on the caller ID of the reported calls; many are spoofed and do not belong to the real caller.

Source: US Federal Trade Commission, Do Not Call reported calls data (daily files).

All US area codes United States +1 Map of area code 628 — cities & rate centres

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