628 Area CodeSan Francisco, CA
Area code 628 covers San Francisco and nearby communities in California, in the Pacific Time (PT) zone, home to about 1.2 million people across 32 cities. It overlays 415, so the same region uses both and every local call needs all ten digits.
Overview
- Major City
- San Francisco
- State
- California (CA)
- Timezone
- Pacific Time (PT)
- Current Time
- Overlay
- Yes – shares area with 415
Where is area code 628?
Area code 628 serves part of San Francisco, CA and the surrounding areas. It has a single overlay (415) that serves the same area.
Overview of the 628 Area Code
What is the 628 area code?
The 628 area code serves San Francisco, California, alongside other established area codes. When you see a 628 number, it indicates a local number within this geographic area.
Why was area code 628 created?
The 628 area code was introduced as an overlay to add numbers in San Francisco once the existing area code 415 began to run out of available prefixes. It added a new supply of numbers without requiring current residents to change their existing digits.
Geographic Coverage of the 628 Area Code
The 628 area code serves San Francisco and surrounding areas in California. It operates within the Pacific Time (PT) time zone. It complements the coverage of area code 415. This area code covers several key cities, including:
- San Francisco
- Daly City
- San Rafael
- Novato
- Mill Valley
- Larkspur
Got a call from a 628 number? It came from San Francisco, CA. Since 628 overlays with 415, every local call in the region needs all ten digits to land on the right line. Inside 628, San Francisco holds about 71% of the population; the rest is split across 31 smaller cities.
San Francisco Area Codes Overview
San Francisco is served by multiple area codes, reflecting its telecommunications needs. The 628 area code operates alongside 415. Here are the area codes serving this region:
The introduction of the 628 area code helped prevent number exhaustion, ensuring a continuous supply of phone numbers across the geographic area.
What cities does area code 628 cover?
| City | State | Population | % of Area Code | % of City |
|---|---|---|---|---|
| San Francisco | CA | 827,526 | 17% | 59% |
| Daly City | CA | 101,418 | 0% | 16% |
| San Rafael | CA | 59,961 | 3% | 100% |
| Novato | CA | 52,311 | 3% | 99% |
| Mill Valley | CA | 13,904 | 1% | 100% |
| Larkspur | CA | 12,807 | 0% | 100% |
| San Anselmo | CA | 12,645 | 0% | 100% |
| Tamalpais-Homestead Valley | CA | 10,735 | 1% | 100% |
| Corte Madera | CA | 10,006 | 1% | 100% |
| Tiburon | CA | 8,933 | 2% | 100% |
* Sources: Population – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). Area code assignments – NANPA CO Code data. See our data methodology.
Has area code 628 been reported for unwanted calls?
Yes – 200 unwanted-call complaints were reported to the FTC for numbers showing a 628 area code (May 29 – Jul 2, 2026).
- 55% robocalls
- ↑ 30% vs prior period
Most-reported subjects
- Other36%71
- Calls pretending to be government, businesses, or family and friends24%47
- Reducing your debt (credit cards, mortgage, student loans)12%23
* Caller ID is easily spoofed, so these figures reflect the number shown on caller ID, not the caller's true location – an area code alone never identifies a caller. The FTC does not verify the facts in these complaints. Source: FTC Do Not Call (DNC) Reported Calls Data, retrieved 2026-07-05.
Which prefixes and exchanges belong to area code 628?
16% assigned to a telco
- 83% Landline
- 17% Wireless
- 0% Unknown
| Prefix | Usage | Carrier |
|---|---|---|
| (628)200- | Landline | Onvoy |
| (628)201- | Landline | Onvoy |
| (628)202- | Wireless | T-Mobile Usa |
| (628)203- | Landline | Onvoy |
| (628)204- | Wireless | T-Mobile Usa |
| (628)205- | Wireless | Verizon Wireless |
| (628)206- | Landline | Pacific Bell |
| (628)207- | Landline | Bandwidth.Com Clec |
| (628)208- | Landline | Vonage America |
| (628)209- | Landline | Telnyx |
Frequently Asked Questions about the 628 Area Code
Who called me from a 628 number?
A 628 number is assigned to San Francisco, California, so a call may come from there. But caller ID is easy to fake, and scammers often spoof a local 628 code to look nearby, so a 628 number doesn't prove the caller is local. Recently, 200 unwanted-call complaints were reported to the FTC for numbers showing the 628 code (55% flagged as robocalls). If you don't recognize the number, let it go to voicemail; a real caller will leave a message.
Is 628 a scam area code?
No area code is a scam on its own. 628 is a normal, officially assigned code for San Francisco, California. Spam callers spoof local codes to raise the odds you answer, so 628 on your caller ID says nothing about who is really calling. Recently, 200 unwanted-call complaints were reported to the FTC for numbers showing the 628 code (55% flagged as robocalls). Judge the call itself, not the area code.
Why do I keep getting calls from the 628 area code?
Repeated calls from different 628 numbers are usually spoofing: a robocaller rotates through 628 numbers so each call looks local and slips past simple blocks. Recently, 200 unwanted-call complaints were reported to the FTC for numbers showing the 628 code (55% flagged as robocalls). Blocking one number rarely helps; voicemail screening, your carrier spam filter, and the Do Not Call Registry work better.
Should I answer an unknown 628 number?
If you aren't expecting a 628 call, let it ring to voicemail. Legitimate callers leave a message, most robocallers hang up when no one picks up, and answering can mark your number as active and bring more calls.
How do I block calls from the 628 area code?
Block a single 628 number from your recent-calls list (iPhone: tap the number, then Block this Caller; Android: tap the number, then Block or report spam). To cut the volume, turn on Silence Unknown Callers on iPhone or spam protection on Android, enable spam filtering from your carrier, and register at DoNotCall.gov. Blocking the entire 628 code also stops legitimate local calls, so use it only as a last resort.
Where is area code 628?
Area code 628 covers San Francisco and the surrounding area in California, spanning 32 cities with about 1,171,595 residents. It shares its area with overlay code 415.
Is 628 a real area code?
Yes. 628 is an active code in the North American Numbering Plan, assigned by NANPA and in service for San Francisco, California. A real code can still show up on spoofed spam calls, so treat unknown 628 calls with normal caution.
What timezone is the 628 area code in?
The 628 area code is in the Pacific Time (PT). Because a number can be kept when someone moves or switches to VoIP, a specific 628 caller may not be in that zone.
How do I call a 628 number from abroad?
From outside the US, dial your country's exit code, then 1 (the US country code), then 628 and the seven-digit number. From a mobile phone you can usually just enter +1 628 followed by the number and let the phone add the exit code for you.