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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 1,154,046 people across 32 cities. It was added in 2015 as an overlay of 415, so the same region uses both codes 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

Nearby Area Codes

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?

Area code 628 went into service on March 21, 2015, as an overlay of 415. An overlay adds a second code to the same territory instead of splitting it: existing 415 numbers kept their digits, new lines began receiving 628 numbers, and local calls in the region require all ten 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. Of the listed cities' population, San Francisco accounts for about 70.6%; 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:

415628

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?

CityStatePopulationPopulation in 628% of listed-city population% of City
San FranciscoCA827,526823,57470.6%99.5%
Daly CityCA101,41817,2368.7%17.0%
San RafaelCA59,96159,9615.1%100.0%
NovatoCA52,31152,3114.5%100.0%
Mill ValleyCA13,90413,9041.2%100.0%
LarkspurCA12,80712,8071.1%100.0%
San AnselmoCA12,64512,6451.1%100.0%
Tamalpais-Homestead ValleyCA10,73510,7350.9%100.0%
Corte MaderaCA10,00610,0060.9%100.0%
TiburonCA8,9338,9330.8%100.0%
FairfaxCA7,4767,4760.6%100.0%
SausalitoCA7,0757,0750.6%100.0%
KentfieldCA6,4856,4850.5%100.0%
Lucas Valley-MarinwoodCA6,0946,0940.5%100.0%
StrawberryCA5,3935,3930.5%100.0%
BrisbaneCA4,6674,6670.4%100.0%
Santa VenetiaCA4,2924,2920.4%100.0%
Marin CityCA2,6662,6660.2%100.0%
Sleepy HollowCA2,3842,3840.2%100.0%
RossCA2,2972,2970.2%100.0%
BelvedereCA2,0802,0800.2%100.0%
Lagunitas-Forest KnollsCA1,8191,8190.2%100.0%
BolinasCA1,6201,6200.1%100.0%
WoodacreCA1,3481,3480.1%100.0%
Black Point-Green PointCA1,3061,3060.1%100.0%
InvernessCA1,3041,3040.1%100.0%
Point Reyes StationCA8488480.1%100.0%
AltoCA7117110.1%100.0%
Stinson BeachCA6326320.0%100.0%
San GeronimoCA4464460.0%100.0%
Muir BeachCA3103100.0%100.0%
NicasioCA96960.0%100.0%

City population is shown in full. The share of each city inside 628 is measured from Census tract centroids, not estimated from a rate-center match – so a city split between two codes appears on both, at the fraction each one actually holds. The “% of listed-city population” column uses the full populations of the cities listed here.

What counties does area code 628 cover?

1,154,046 residents across 3 counties, counted inside the 628 boundary — a county split between codes contributes only its part.

CountyStatePopulation in 628% of area-code footprint% of County
San Francisco CountyCA869,79175%100%
Marin CountyCA262,32123%100%
San Mateo CountyCA21,9342%3%

Sources: City populations – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). State populations – the same program, Vintage 2025 (CO-EST2025-ALLDATA). Area-code footprint and county populations – 2020 Census Centers of Population, mapped against NANP area code boundaries. The share of each city inside a code is measured the same way, against Census place boundaries from the Census Bureau's TIGERweb service. Area code assignments – NANPA CO Code data. See our data methodology.

Has area code 628 been reported for unwanted calls?

Yes – 506 unwanted-call complaints were reported to the FTC for numbers showing a 628 area code (May 29 – Aug 14, 2026).

  • 46% robocalls
  • ↑ 32% vs prior period

Most-reported subjects

  • Other36%182
  • Calls pretending to be government, businesses, or family and friends30%153
  • Reducing your debt (credit cards, mortgage, student loans)10%50

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 2026-08-17.

Which prefixes and exchanges belong to area code 628?

16% assigned to a telco

  • 83% Landline
  • 17% Wireless
  • 0% Unknown
PrefixUsageCarrier
(628)200-LandlineOnvoy
(628)201-LandlineOnvoy
(628)202-WirelessT-Mobile Usa
(628)203-LandlineOnvoy
(628)204-WirelessT-Mobile Usa
(628)205-WirelessVerizon Wireless
(628)206-LandlinePacific Bell
(628)207-LandlineBandwidth.Com Clec
(628)208-LandlineVonage America
(628)209-LandlineTelnyx
(628)210-LandlinePeerless Network Of California
(628)212-LandlineBandwidth.Com Clec
(628)213-WirelessT-Mobile Usa
(628)214-LandlinePeerless Network Of California
(628)215-LandlineBandwidth.Com Clec
(628)216-LandlineBandwidth.Com Clec
(628)217-LandlineTeleport Communications America
(628)218-LandlineMcimetro Access Transmission Services
(628)219-WirelessNew Cingular Wireless Pcs
(628)220-LandlineLevel 3 Communications
(628)221-LandlineCenturylink Communications
(628)222-LandlineOnvoy
(628)223-LandlineTeleport Communications America
(628)224-WirelessNew Cingular Wireless Pcs
(628)225-WirelessVerizon Wireless
(628)226-WirelessNew Cingular Wireless Pcs
(628)227-LandlineBandwidth.Com Clec
(628)228-LandlinePacific Bell
(628)229-LandlineOnvoy
(628)230-WirelessVerizon Wireless
(628)231-LandlineTeleport Communications America
(628)232-LandlinePeerless Network Of California
(628)233-WirelessNew Cingular Wireless Pcs
(628)234-LandlineTpx Communications
(628)235-LandlineLevel 3 Communications
(628)236-WirelessT-Mobile Usa
(628)237-WirelessT-Mobile Usa
(628)238-LandlinePeerless Network Of California
(628)239-LandlineBandwidth.Com Clec
(628)240-LandlineMetropcs
(628)241-WirelessT-Mobile Usa
(628)242-LandlinePacific Bell
(628)243-LandlineOnvoy
(628)244-LandlinePeerless Network Of California
(628)245-LandlineOnvoy
(628)246-LandlineBandwidth.Com Clec
(628)247-LandlineTeleport Communications America
(628)248-LandlineTeleport Communications America
(628)249-WirelessVerizon Wireless
(628)250-WirelessVerizon Wireless
(628)251-LandlinePeerless Network Of California
(628)252-WirelessT-Mobile Usa
(628)253-LandlineBandwidth.Com Clec
(628)254-LandlineBandwidth.Com Clec
(628)255-WirelessVerizon Wireless
(628)256-LandlineSonic Telecom
(628)257-LandlineRace Telecommunications
(628)258-WirelessT-Mobile Usa
(628)259-WirelessNew Cingular Wireless Pcs
(628)260-LandlineTeleport Communications America
(628)261-LandlineTerra Nova Telecom
(628)262-LandlineExiant Communications
(628)263-LandlineMcimetro Access Transmission Services
(628)264-WirelessT-Mobile Usa
(628)265-LandlineBandwidth.Com Clec
(628)266-LandlineBandwidth.Com Clec
(628)267-LandlineTeleport Communications America
(628)268-LandlineLevel 3 Communications
(628)269-WirelessT-Mobile Usa
(628)270-LandlineSonic Telecom
(628)271-LandlineOnvoy Spectrum
(628)272-LandlineOnvoy
(628)273-LandlineLevel 3 Communications
(628)274-LandlineLevel 3 Communications
(628)275-LandlineLevel 3 Communications
(628)276-LandlineWhitesky Communications
(628)277-LandlineTelnyx
(628)278-WirelessNew Cingular Wireless Pcs
(628)279-LandlineBandwidth.Com Clec
(628)280-LandlineSonic Telecom
(628)281-LandlineNuso
(628)282-LandlineAt&T
(628)283-WirelessT-Mobile Usa
(628)284-LandlinePaetec Communications
(628)285-LandlineOnvoy
(628)286-LandlineWide Voice
(628)287-LandlineFive9
(628)288-LandlineFractel
(628)299-LandlineFractel
(628)300-LandlineOnvoy
(628)313-WirelessT-Mobile Usa
(628)321-LandlineTeleport Communications America
(628)322-LandlineTeleport Communications America
(628)323-LandlineTeleport Communications America
(628)324-LandlineTeleport Communications America
(628)325-LandlineTeleport Communications America
(628)326-LandlineTeleport Communications America
(628)333-LandlineOnvoy
(628)336-LandlineFractel
(628)345-LandlineFractel
(628)348-LandlineFractel
(628)356-LandlineFractel
(628)358-WirelessT-Mobile Usa
(628)363-WirelessVerizon Wireless
(628)377-LandlineFractel
(628)386-LandlineFractel
(628)388-LandlineFractel
(628)399-LandlineFractel
(628)400-LandlineOnvoy
(628)432-LandlineFractel
(628)433-LandlineBandwidth.Com Clec
(628)444-LandlineOnvoy
(628)465-LandlineFractel
(628)466-LandlineWavenation
(628)468-LandlineSkyetel
(628)477-LandlineFractel
(628)488-LandlineFractel
(628)500-LandlineOnvoy
(628)502-WirelessVerizon Wireless
(628)529-LandlineFractel
(628)561-LandlinePeerless Network Of California
(628)577-LandlineFractel
(628)587-LandlineFractel
(628)588-LandlineFractel
(628)600-LandlineOnvoy
(628)626-LandlineOnvoy
(628)628-LandlineFractel
(628)629-LandlineHd Carrier
(628)652-LandlineTeleport Communications America
(628)666-LandlineOnvoy
(628)667-LandlineFractel
(628)677-LandlineFractel
(628)682-LandlineTwilio International
(628)688-LandlineFractel
(628)699-LandlineFractel
(628)724-LandlineFractel
(628)732-LandlineFractel
(628)754-LandlineTeleport Communications America
(628)758-LandlineFractel
(628)766-LandlineFractel
(628)777-LandlineOnvoy
(628)786-LandlineFractel
(628)788-LandlineFractel
(628)789-LandlineLeap Telecom
(628)800-LandlineOnvoy
(628)842-LandlineFractel
(628)866-LandlineFractel
(628)867-LandlineCommio
(628)877-LandlineOnvoy
(628)888-LandlineOnvoy
(628)895-LandlineRclec
(628)899-LandlinePeerless Network Of California
(628)900-LandlineOnvoy
(628)946-LandlineFractel
(628)977-LandlineFractel
(628)999-LandlineOnvoy

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, 506 unwanted-call complaints were reported to the FTC for numbers showing the 628 code (46% 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, 506 unwanted-call complaints were reported to the FTC for numbers showing the 628 code (46% 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, 506 unwanted-call complaints were reported to the FTC for numbers showing the 628 code (46% 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 1,154,046 residents. It shares its area with overlay code 415.

When did area code 628 go into service?

Area code 628 went into service on March 21, 2015. It was added as an overlay of 415, so 628 numbers serve the same area that 415 already covered.

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.

Related Area Codes