628 Area Code: San Francisco, California
Area code 628 serves San Francisco, San Rafael and Belvedere, California in the Pacific time zone, in service since 2015. Consumers have filed 1,700 unwanted-call complaints against 1,399 different 628 numbers, 337 of them with the FTC in the last 30 days. Look up the exact number that called you below.
Area code 628 at a glance
- State
- California
- Main cities
- San Francisco, San Rafael, Belvedere, Novato, Sausalito, Corte Madera + 6 more
- Counties
- San Francisco County, Marin County
- Local time
- —Pacific
- In service since
- March 21, 2015
- Overlay of
- 415
- Local dialing
- 10 digits (area code + number)
- Exchanges
- 14 rate centers, 193 prefixes
Sources: NANPA area code and central office code records (refreshed weekly); cities and counties matched from US Census Bureau and USGS place names.
Reported 628 numbers
No single 628 number has enough complaints yet for a full report page, so none are listed. Look up the exact number that called you: the lookup works on every US number, whether or not it has complaint history.
What calls from 628 numbers are about
804 FTC Do Not Call complaints about 628 numbers since Jul 24. The most common named subject is impostor calls (people pretending to be a government agency, a business or family), at 23% of complaints (28% of those were recorded messages). Overall, 57% of callers who answered said the call was a robocall.
FTC complaint subjects
- Other / unspecified31639%
- Impostor (government, business, family)18123%
- Debt reduction14618%
- Dropped call / no message729%
- No subject given506%
- Medical & prescriptions111%
- Computer & tech support61%
FCC complaints by call type, last 2 years
- Live Voice5945%
- Prerecorded Voice5642%
- Text Message1713%
13% of recent FCC complaints about 628 numbers are about text messages, not calls.
When 628 spam calls come in
30% of complaints that give a call time describe calls between 12pm and 3pm. 87% came Monday to Friday, most on Tuesdays. Times are as consumers reported them to the FTC.
By hour of the day
By day of the week
Is it getting worse?
331 FTC complaints about 628 numbers in the last four weeks, up 34% on the four weeks before. FCC complaints about 628 numbers peaked in 2020 (193); the FTC's daily Do Not Call data has carried most of the volume since mid-2026.
FTC complaints per week
FCC complaints per year
Years shown as '15 to '26; the current year is partial.
Who gets these calls
Only 35% of the FTC complaints about 628 numbers came from California residents; the most came from Texas, New York and Illinois. 628 numbers are being used for nationwide campaigns, so the area code says little about where the caller is.
Where complainants live
- California28535%
- Texas506%
- New York486%
- Illinois354%
- New Jersey304%
Busiest 628 prefixes this month
FTC complaints in the last 30 days, grouped by the first six digits. When one prefix collects complaints about many different numbers, a campaign is usually cycling through that block. The carrier is who NANPA assigned the prefix to, not who made the calls.
| Prefix | Complaints | Numbers | Carrier | Exchange |
|---|---|---|---|---|
| (628) 289-xxxx | 14 | 10 | Five9, INC. | San Francisco |
| (628) 316-xxxx | 12 | 11 | AT&T Mobility (New Cingular Wireless PCS) | San Francisco |
| (628) 287-xxxx | 11 | 11 | Five9, INC. | San Francisco |
| (628) 999-xxxx | 11 | 10 | Onvoy (Sinch) | San Francisco |
| (628) 468-xxxx | 10 | 10 | Skye Telecom LLC dba Skyetel | San Francisco |
Carriers operating in 628
NANPA has assigned 193 628 prefixes (NPA-NXX central-office codes) across 14 rate centers: 26% to wireless carriers, 74% to landline and VoIP operators; 99% are pooled blocks shared by several carriers. 2 prefixes were assigned in the last 12 months (newest 2026-06-26). The carrier holding a prefix is who the number was issued through. It says nothing about who is calling, since caller ID is routinely spoofed.
| Carrier | Type | Prefixes | Rate centers | Newest assignment |
|---|---|---|---|---|
| Fractel, LLC | Competitive / VoIP (CLEC) | 33(17%) | 14 | 2022-05-24 |
| Onvoy (Sinch) | Competitive / VoIP (CLEC) | 32(17%) | 10 | 2026-06-26 |
| T-Mobile USA | Wireless | 28(15%) | 9 | 2025-11-06 |
| Teleport Communications America, LLC | Competitive / VoIP (CLEC) | 17(9%) | 2 | 2025-04-28 |
| Bandwidth.com | Competitive / VoIP (CLEC) | 13(7%) | 10 | 2021-11-05 |
| AT&T Mobility (New Cingular Wireless PCS) | Wireless | 12(6%) | 6 | 2025-01-13 |
| Verizon Wireless (Cellco Partnership) | Wireless | 9(5%) | 2 | 2022-06-17 |
| Peerless Network | Competitive / VoIP (CLEC) | 8(4%) | 7 | 2018-02-15 |
| Level 3 (Lumen) | Competitive / VoIP (CLEC) | 6(3%) | 1 | 2019-08-26 |
| Commio, LLC | Competitive / VoIP (CLEC) | 3(2%) | 3 | 2023-08-09 |
| Pacific Bell (AT&T) | Incumbent landline (ILEC) | 3(2%) | 1 | 2016-02-18 |
| Sonic Telecom, LLC | Competitive / VoIP (CLEC) | 3(2%) | 1 | 2018-12-11 |
Largest rate centers (exchanges) by prefixes: San Francisco (116), San Rafael (17), Belvedere (10), Corte Madera (7), Mill Valley (7), Novato (7), Sausalito (7), Ignacio (6). Source: NANPA Central Office Code Utilized Assignments (public, refreshed weekly).
What to do about calls from 628 numbers
Before you call back
- Impostor (government, business, family) is the top named complaint here. Hang up and call the agency, bank or relative back on a number you already know. Government agencies don't demand payment by gift card, wire transfer or crypto. Read about Social Security impostor calls and fake bank fraud calls.
- Look up the full number above. A missed call from 628 with no voicemail is usually a robocall; anyone who needs you will leave a message.
- Block repeat callers: iPhone, Android, or your carrier's free filter (Verizon, AT&T, T-Mobile).
Report it in California
- Unwanted sales calls and robocalls: donotcall.gov (FTC). Scams and fraud: ReportFraud.ftc.gov.
- Spoofing, texts and call-blocking problems: FCC consumer complaints.
- State complaints: California Attorney General.
- California formally adopted the FTC's National Do Not Call Registry as its own state list rather than running a separate one, so a single free registration at donotcall.gov covers you. State authorities can still enforce against telemarketers who ignore it, in addition to any federal penalty.
Your FTC and FCC reports are published (without your name or number) in the datasets this page is built from. How to report unwanted calls.
Area code 628: questions answered from the data
Where is area code 628?
Area code 628 serves San Francisco, San Rafael and Belvedere, California, covering San Francisco County and Marin County. It has been in service since March 21, 2015.
What time zone is area code 628 in?
Area code 628 is in the Pacific time zone (UTC−8, or UTC−7 during daylight saving time). The current local time is shown at the top of this page.
What are calls from 628 numbers usually about?
Since Jul 24, consumers filed 804 FTC Do Not Call complaints about 628 numbers. The most common named subject was impostor calls (people pretending to be a government agency, a business or family): 23% of complaints, 28% of them recorded messages. Across all subjects, 57% of callers who answered the question said the call was a robocall.
When do 628 spam calls happen?
30% of the complaints that give a call time describe calls between 12pm and 3pm, and 87% came on weekdays, most often on Tuesday. Times are as consumers reported them.
Are calls from 628 numbers really local?
Not necessarily. Only 35% of the FTC complaints about 628 numbers came from California residents; the most came from Texas, New York and Illinois. 628 numbers are being used for nationwide campaigns, so the area code says little about where the caller is.
Are 628 robocalls increasing?
In the four weeks to Oct 20, consumers filed 331 FTC complaints about 628 numbers, 34% more than the four weeks before.
How do I report a 628 scam call in California?
Report unwanted sales calls and robocalls to the FTC at donotcall.gov, and scams to ReportFraud.ftc.gov. The FCC takes complaints at consumercomplaints.fcc.gov. In California, the California Attorney General also handles consumer complaints about scam calls. Reports feed the public data this page is built from.
Overlay and nearby area codes
Sources: FTC Do Not Call complaints (unverified consumer reports), published every weekday and available here from Jul 24; FCC Consumer Complaint Data, public record, imported nightly; NANPA numbering records. A number appearing here means consumers reported calls that displayed it. Caller ID can be spoofed.