Discovering the truth about a phone number, email, or address history can be eye-opening, please use this tool with caution.USA Area code 650 - Palo Alto, CA
Area code 650 is a North American Numbering Plan telephone area code serving Area code for San Mateo County and parts of Santa Clara County, California in California. It today covers roughly 1.9 million residents across 45 cities and towns, primarily in San Mateo County .
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Who called me from area code 650?
A call from area code 650 most likely originates from Palo Alto or elsewhere in California - but caller ID spoofing means the area code alone cannot confirm who called. Right now, 25 650 numbers carry scam reports on this page. The only reliable way to identify the caller is to check the full 10-digit number:
- Run the number through the reverse phone lookup at the top of this page to see the owner's name, carrier, and location.
- Compare it against the recently reported scam numbers in 650 below.
- If the call was unwanted, report it to the FTC and use the report form on this page so other 650 residents see it.
Report a scam call from 650 Help other 650-area residents - takes 20 seconds, no signup
Reports are reviewed by our team before appearing on the page. The highest-reported numbers get added to the “Recently reported scam numbers” list above with a “community” badge.
Should I answer a call from a 650 number? Take the 30-second quiz - 5 questions, verdict + advice
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Next step: run a reverse-phone lookup on the number to see everything public about it.
Where is the 650 area code? Coverage map
The pin marks Palo Alto, the largest city served by area code 650. Zoom and pan to explore the coverage region.
Interactive map. Click a pin for city details. Data © OpenStreetMap contributors.
Cities in the 650 area code
Area code 650 serves the following 45 communities across 2 counties:
Area codes near 650 (overlay + neighboring)
If a caller ID shows one of these codes, the call is probably still from the Palo Alto area or a nearby region. Click any code to see its own page.
650 area code robocall complaints (FCC data)
Monthly count of FCC complaints tagged to numbers in area code 650 over the last 12 months.
119 complaints in the last 12 months. That's about 56% fewer robocall complaints per capita than the US average - 6 per 100,000 residents vs a national average of 14.7.
Source: FCC Consumer Complaint Data (dataset vakf-fz8e). Data as of August 9, 2026. Refreshed monthly.
How 650 area code spam calls arrive
Based on 119 FCC complaints in the last 12 months, here's how 650 spam calls reached recipients:
FCC Consumer Complaint Data, last 12 months as of August 9, 2026. Refreshed monthly. Note: the FCC dataset labels method (Live Voice / Prerecorded / SMS) but does not classify scam type (IRS impersonation, tech support fraud, etc.) - those come from community reports.
Recently reported scam numbers in 650
Numbers reported to the FCC or by our community in the last 12 months. Click any to run a full reverse-phone lookup.
Source: FCC Consumer Complaint Data, last 12 months as of August 9, 2026. Refreshed monthly. Numbers submitted via the report form near the top of this page get added here with a “community” badge after moderation.
How to block 650 spam calls (by carrier)
Getting repeated spam calls from 650 numbers around Palo Alto, California? You can't legitimately block every 650 call without also missing legitimate ones from Palo Alto, California - so the practical fix is to turn on your carrier's free spam filter and register on the national do-not-call list. Step-by-step for each major US carrier below.
AT&T
- Download the free AT&T ActiveArmor app (iOS + Android).
- Sign in with your wireless number.
- Enable Fraud Blocking and Suspected Spam Warning.
- To block a specific number, tap the call in your history → Block.
Verizon
- Download the free Verizon Call Filter app (iOS + Android).
- Sign in with your Verizon account.
- Turn on Spam Filter.
- To block a specific number: My Verizon → Blocks → Add Number.
T-Mobile
- Download the free Scam Shield app (iOS + Android).
- Enable Scam Block (blocks known scam calls silently).
- Use Scam ID to see “Scam Likely” caller ID on suspicious numbers.
- To block a specific number, dial
#662#from your device.
All carriers
- Register on the FTC's National Do-Not-Call list.
- Report unwanted calls to the FCC at fcc.gov/complaints.
- On iPhone: Settings → Phone → Silence Unknown Callers.
- On Android: Phone app → ⋮ → Settings → Caller ID & spam.
Sources: carrier support pages (AT&T, Verizon, T-Mobile), FCC consumer guides. Free features as of 2026. Every one of these steps costs nothing.
History of the 650 area code
state of California. It was split from area code 415 on August 2, 1997, and includes most of San Mateo County (except the northernmost portion), part of San Francisco, and the northwestern portion of Santa Clara County including Palo Alto, Mountain View, and Los Altos.
650 area code FAQ: common questions
What area code is 650?
Area code 650 is a North American Numbering Plan area code that serves Area code for San Mateo County and parts of Santa Clara County, California in California, primarily including Palo Alto and surrounding communities.
Where does area code 650 cover?
Area code 650 covers San Mateo County, Santa Clara County, including cities such as Atherton, Belmont, Broadmoor, Burlingame, Colma, and roughly 40 other communities.
Is 650 a real area code or a scam?
650 is a real, actively-assigned US area code - not itself a scam. However, spammers do use 650 numbers because the code is well-known and appears local to millions of residents. Always verify the specific number, not the area code.
How do I block 650 spam calls?
You cannot legitimately block an entire area code without also blocking legitimate calls from Palo Alto. Better options: register on the National Do-Not-Call list, enable your carrier's spam-filter (all major US carriers now offer this free), and report unwanted calls to the FCC at fcc.gov/complaints so they show up in the trend data on this page.
What's the overlay area code for 650?
650 does not currently have an overlay area code assigned. New numbers in the region are still issued with the 650 prefix.
Sources
Or explore reverse-phone lookup for any US number.