650 Area Code: Palo Alto, California
Area code 650 serves Palo Alto, San Mateo and Mountain View, California in the Pacific time zone, in service since 1997. Consumers have filed 4,969 unwanted-call complaints against 3,754 different 650 numbers, 526 of them with the FTC in the last 30 days. Look up the exact number that called you below.
Area code 650 at a glance
- State
- California
- Main cities
- Palo Alto, San Mateo, Mountain View, South San Francisco, Redwood City, San Carlos–Belmont + 9 more
- Counties
- San Mateo County, Santa Clara County, San Francisco County
- Local time
- —Pacific
- In service since
- August 2, 1997
- Split from
- 415
- Local dialing
- 10 digits (area code + number)
- Exchanges
- 15 rate centers, 716 prefixes
Sources: NANPA area code and central office code records (refreshed weekly); cities and counties matched from US Census Bureau and USGS place names.
Most-reported 650 numbers
Ranked by FTC Do Not Call complaints this month, then all-time FTC and FCC complaints. Only numbers with enough complaints for a full report page are listed. Click one for what it was reported for and where.
- (650) 215-5634Impostor (government, business, family)27 this month2026-10-17
- (650) 215-5637Impostor (government, business, family)21 this month2026-10-17
- (650) 215-5671Impostor (government, business, family)14 this month2026-10-19
- (650) 215-5275Impostor (government, business, family)11 this month2026-10-20
- (650) 215-5632Impostor (government, business, family)7 this month2026-10-19
- (650) 215-5628Impostor (government, business, family)6 this month2026-10-19
- (650) 215-5641Impostor (government, business, family)5 this month2026-10-17
- (650) 215-5633Impostor (government, business, family)5 this month2026-10-14
- (650) 265-6786Impostor (government, business, family)4 this month2026-10-17
- (650) 204-1111Impostor (government, business, family)3 this month2026-10-05
- (650) 203-0000Impostor (government, business, family)3 this month2026-10-01
- (650) 450-494014 reports2025-12-13
- (650) 215-5255Impostor (government, business, family)11 reports2026-09-19
What calls from 650 numbers are about
1,383 FTC Do Not Call complaints about 650 numbers since Jul 24. The most common named subject is impostor calls (people pretending to be a government agency, a business or family), at 20% of complaints (56% of those were recorded messages). Overall, 58% of callers who answered said the call was a robocall.
FTC complaint subjects
- Other / unspecified52538%
- Impostor (government, business, family)28320%
- Debt reduction17713%
- Dropped call / no message14510%
- No subject given1048%
- Computer & tech support494%
- Medical & prescriptions282%
FCC complaints by call type, last 2 years
- Live Voice13252%
- Prerecorded Voice9738%
- Text Message2510%
10% of recent FCC complaints about 650 numbers are about text messages, not calls.
When 650 spam calls come in
27% of complaints that give a call time describe calls between 2pm and 5pm. 90% came Monday to Friday, most on Thursdays, the pattern of call-center robocall campaigns that run on business hours. Times are as consumers reported them to the FTC.
By hour of the day
By day of the week
Is it getting worse?
518 FTC complaints about 650 numbers in the last four weeks, up 23% on the four weeks before. FCC complaints about 650 numbers peaked in 2017 (539); 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
53% of the FTC complaints about 650 numbers came from California residents, but only 31% from people with 650 numbers themselves. The calls are mostly regional rather than aimed at 650 phones specifically.
Where complainants live
- California72953%
- New York534%
- Florida524%
- Texas413%
- Pennsylvania403%
What people with 650 numbers report
People whose own number starts with 650 filed 2,590 FTC complaints since Jul 24. 17% were about calls showing another 650 number. The most common named subject was debt-relief pitches.
Area codes on the calls they reported
- 650 (same code)43417%
- 888 (toll-free)1355%
- 866 (toll-free)1265%
- 877 (toll-free)1205%
- 855 (toll-free)903%
Likely campaigns using 650 numbers
Groups of numbers that drew the same FTC complaint in the same pattern over the last 60 days. The grouping is statistical and doesn't identify who is calling.
Busiest 650 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 |
|---|---|---|---|---|
| (650) 215-xxxxcampaign | 117 | 20 | Level 3 (Lumen) | Mountain View |
| (650) 563-xxxx | 10 | 10 | Pacific Bell (AT&T) | Moss Beach |
| (650) 204-xxxx | 9 | 3 | Level 3 (Lumen) | Millbrae |
| (650) 662-xxxx | 8 | 8 | Hd Carrier LLC | La Honda |
| (650) 984-xxxx | 8 | 8 | Onvoy (Sinch) | Pacifica |
Carriers operating in 650
NANPA has assigned 716 650 prefixes (NPA-NXX central-office codes) across 15 rate centers: 24% to wireless carriers, 75% to landline and VoIP operators; 72% are pooled blocks shared by several carriers. 11 prefixes were assigned in the last 12 months (newest 2026-09-24). 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 |
|---|---|---|---|---|
| Pacific Bell (AT&T) | Incumbent landline (ILEC) | 272(38%) | 15 | 2010-12-23 |
| AT&T Mobility (New Cingular Wireless PCS) | Wireless | 59(8%) | 10 | 2024-11-25 |
| T-Mobile USA | Wireless | 57(8%) | 8 | 2023-10-10 |
| Onvoy (Sinch) | Competitive / VoIP (CLEC) | 45(6%) | 14 | 2026-09-03 |
| Level 3 (Lumen) | Competitive / VoIP (CLEC) | 42(6%) | 12 | 2019-03-22 |
| MCImetro (Verizon Business) | Competitive / VoIP (CLEC) | 42(6%) | 13 | 2013-08-19 |
| Verizon Wireless (Cellco Partnership) | Wireless | 36(5%) | 8 | 2026-09-24 |
| Teleport Communications America, LLC | Competitive / VoIP (CLEC) | 26(4%) | 15 | 2023-06-02 |
| U.S. Telepacific CORP. dba Tpx Communications | Competitive / VoIP (CLEC) | 24(3%) | 14 | — |
| Bandwidth.com | Competitive / VoIP (CLEC) | 16(2%) | 9 | 2024-10-03 |
| MCImetro (Verizon Business) | Competitive / VoIP (CLEC) | 15(2%) | 10 | 2017-09-12 |
| Metro by T-Mobile (MetroPCS) | Wireless | 14(2%) | 8 | 2001-09-21 |
Largest rate centers (exchanges) by prefixes: Palo Alto (145), San Mateo (126), Mountain View (93), South San Francisco (89), Redwood City (65), San Carlos–Belmont (44), Los Altos (28), Millbrae (24), San Francisco (22), Half Moon Bay (21). Source: NANPA Central Office Code Utilized Assignments (public, refreshed weekly).
What to do about calls from 650 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 650 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 650: questions answered from the data
Where is area code 650?
Area code 650 serves Palo Alto, San Mateo and Mountain View, California, covering San Mateo County, Santa Clara County and San Francisco County. It has been in service since August 2, 1997. It was split from area code 415.
What time zone is area code 650 in?
Area code 650 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 650 numbers usually about?
Since Jul 24, consumers filed 1,383 FTC Do Not Call complaints about 650 numbers. The most common named subject was impostor calls (people pretending to be a government agency, a business or family): 20% of complaints, 56% of them recorded messages. Across all subjects, 58% of callers who answered the question said the call was a robocall.
When do 650 spam calls happen?
27% of the complaints that give a call time describe calls between 2pm and 5pm, and 90% came on weekdays, most often on Thursday. Times are as consumers reported them.
Are calls from 650 numbers really local?
Not necessarily. 53% of the FTC complaints about 650 numbers came from California residents, but only 31% from people with 650 numbers themselves. The calls are mostly regional rather than aimed at 650 phones specifically.
Are 650 robocalls increasing?
In the four weeks to Oct 20, consumers filed 518 FTC complaints about 650 numbers, 23% more than the four weeks before.
How do I report a 650 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.
Other California 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.