The 628 area code covers the same area as 415, including San Francisco, San Rafael and 9 more places in California.
Area code 628 is in California, on Pacific Time. In the 628 area, phone numbers are given out most in the City and County of San Francisco, then Marin County. It has been in service since March 21, 2015. 415 covers the same area, so two neighbours can have different area codes.
- Where
- City and County of San Francisco and Marin County, California
- Time zone
- Pacific Time
- In service since
- March 21, 2015
- Shares its area with
- 415 (since 1947)
- Prefixes in use
- 193
- How to dial
- Local calls need 1, then the area code, then the number: 1-628-555-0142.
Find out who called you from a 628 number.
Enter the full 10-digit number to see who it is listed to and the city and state on the listing. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup. To see whether it is a mobile, a landline or a VoIP line, use our free VoIP checker. To see which carrier a (628) number is on today, use our free carrier lookup.
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San Francisco holds 60% of the phone prefixes in area code 628.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 193 prefixes in use shows where 628 numbers are actually given out.
- San Francisco116 prefixes, 60%
- San Rafael17 prefixes, 9%
- Novato13 prefixes, 7%
- Belvedere Tiburon10 prefixes, 5%
- Corte Madera7 prefixes, 4%
- Mill Valley7 prefixes, 4%
- Sausalito7 prefixes, 4%
- Nicasio5 prefixes, 3%
Also served: Stinson Beach, Nicasio and Inverness.
Of the carriers named here, Fractel holds the most phone number prefixes in area code 628: 33 of 193.
NANPA, which runs the North American numbering plan, assigns each prefix (the three digits after the area code) to one carrier. Here is how the 193 prefixes in use in 628 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| Fractel | 33 | 17% |
| T-MobileMobile network | 28 | 15% |
| Teleport (AT&T)AT&T's business phone network | 17 | 9% |
| BandwidthSupplies numbers to VoIP and app-based phone services | 13 | 7% |
| AT&T MobilityMobile network | 12 | 6% |
| Peerless NetworkWholesale phone carrier | 8 | 4% |
| 25 other carriers | 82 | 42% |
99% of these prefixes are pooled, which means the blocks of 1,000 numbers inside them can belong to other carriers. Any number can also have been moved to another carrier since, so this shows who holds the prefixes, not who serves a given number.
Want the carrier of one exact number? Our free carrier lookup checks it, because numbers move between carriers.
Source: NANPA central office code assignments, October 1, 2026.
628 started in 2015 as an overlay on 415, and its ground has not changed since.
2015
628 starts on March 21, 2015, as an overlay on 415: new numbers on the same ground.
A 628 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
The area codes closest to 628 are 510, 650 and 925.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
California has 40 other area codes.
These are the questions people ask most about area code 628.
Where is area code 628?
628 covers San Francisco, San Rafael, Novato and Sausalito and 7 more places in California. In the 628 area, phone numbers are given out most in the City and County of San Francisco, then Marin County.
What state is area code 628 in?
California. 628 is a California area code on Pacific Time.
What cities use area code 628?
The places holding the most 628 prefixes are San Francisco, San Rafael, Novato, Sausalito, Mill Valley, Belvedere Tiburon, Corte Madera and Point Reyes Station, out of 11 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 628?
No single phone company owns 628. NANPA's records list its 193 prefixes across many carriers, and the ones named on this page include Fractel, T-Mobile and Teleport (AT&T). Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 628 in?
628 is on Pacific Time.
When did area code 628 start?
628 went into service on March 21, 2015, as an overlay on 415: new numbers for the same area.
Is 628 the same area as 415?
Yes. 415 (since 1947) covers the same ground as 628. Nobody's number changed when it was added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial a 628 number?
Local calls need 1, then the area code, then the number: 1-628-555-0142.
Is 628 a toll-free number?
No. 628 is a regular area code for San Francisco and San Rafael in California, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 628?
The closest are 510/341 (Oakland, California), 650 (Palo Alto, California), 925 (Walnut Creek, California) and 408/669 (San Jose, California), measured between the centres of each area.
Who called me from a 628 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 628 a scam?
628 is a real California area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Put this lookup on your site: our free area code widget takes two lines of code and shows any US area code's state, time zone and local time.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.