650 area code: San Mateo and Palo Alto, time zone and cities
Area code 650 covers most of San Mateo County, part of San Francisco, and the northwestern part of Santa Clara County, including Palo Alto, Mountain View and Los Altos. It was split from area code 415 in 1997.
Quick facts
- Location
- San Mateo County and northwestern Santa Clara County, California
- State
- California
- Time zone
- Pacific TimeLocal time now:
- Overlay
- No. 650 is the only area code for its area.
- In service since
- 1997
Cities and places in area code 650
- Atherton
- Belmont
- Broadmoor
- Burlingame
- Colma
- Daly City (a small part is in 415)
- East Palo Alto
- El Granada
- Emerald Lake Hills
- Foster City
- Half Moon Bay
- Highlands-Baywood Park
- Hillsborough
- Kings Mountain
- La Honda
- Ladera
- Loma Mar
- Los Trancos Woods
- Menlo Park
- Middleton Tract
- Millbrae
- Montara
- Moss Beach
- North Fair Oaks
- Pacifica
- Pescadero
- Portola Valley
- Princeton-by-the-Sea
- Redwood City
- San Bruno
- San Carlos
- San Gregorio
- San Mateo
- Sky Londa
- South San Francisco
- West Menlo Park
- Woodside
- Los Altos
- Los Altos Hills
- Loyola
- Mountain View
- Palo Alto
- Stanford
- Sunnyvale (western edge)
- San Francisco (part)
Counties
- San Mateo County (all but the northernmost part)
- Santa Clara County (northwestern part)
- San Francisco County (part)
Area codes that share or border 650
650 has no overlay. It is the only area code for its area.
Nearby
- 341 CA
- 408 CA
- 415 CA
- 510 CA
- 628 CA
- 669 CA
- 831 CA
- 925 CA
Is a call from 650 a scam?
The area code alone says nothing about the caller. It shows where the number was set up. It does not show who is calling or where they are. The FTC says scammers can make any name or number show up on caller ID. This is called spoofing, and it can make a call look local when it comes from anywhere in the world.
Signs of a phone scam, from the FTC:
- The caller says you won a prize, but you have to pay to get it.
- The caller says you will be arrested or fined unless you pay right away. Real law enforcement and federal agencies do not call and threaten you.
- The caller insists you pay by gift card, wire transfer, cryptocurrency or a payment app.
- The caller says they are from a government agency and asks for your Social Security number.
What to do:
- If you get a robocall, hang up. Do not press any number, which could lead to more robocalls.
- Ask your phone carrier what call blocking it offers.
- Report unwanted calls at DoNotCall.gov. If you lost money, report it at ReportFraud.ftc.gov.
How to get a 650 phone number
For an AI agent or a business
Our API lines are real T-Mobile mobile numbers for texts, or for texts and calls over SIP, rented by the month. Add "area_code": "650" to an order to ask for 650 numbers.
The area code is a request and is not guaranteed. Numbers come from our stock and from the carrier, so some can have another area code. If the carrier cannot fill the request within about an hour, we send numbers from other area codes.
Numbers for AI agents and businesses
For your own phone
Our T-Mobile Talk & Text line asks where your number should come from at checkout. If you live in the 650 area, give your address, and we ask the carrier for a number local to your ZIP code. The carrier picks the area code, so a 650 number is not guaranteed.
Our Unlimited line has no area code choice.
Questions about area code 650
Where is area code 650?
Area code 650 covers most of San Mateo County, part of San Francisco, and the northwestern part of Santa Clara County, including Palo Alto, Mountain View and Los Altos. It was split from area code 415 in 1997.
What time zone is area code 650 in?
Pacific Time.
Does area code 650 have an overlay?
No. 650 is the only area code for its area.
When did area code 650 start?
NANPA lists 650 as in service since 1997.
Is a call from area code 650 a scam?
The area code alone does not make a call a scam. It shows where the number was set up. The FTC says scammers can make any number show up on caller ID. If you get a robocall, hang up without pressing any number, and report unwanted calls at DoNotCall.gov.
How can I get a phone number with area code 650?
For an AI agent or a business, add "area_code": "650" to an API order. For your phone, if you live in the 650 area, give your address at checkout for our T-Mobile Talk & Text line and we ask the carrier for a number local to your ZIP code. Either way the area code is a request and is not guaranteed.
Sources: NANPA area code database, file of November 3, 2026 (state, time zone, overlays, year in service); Wikipedia, "Area code 650", revision of February 27, 2026 (area, places and neighbors); FTC, "Phone Scams" and "How To Block Unwanted Calls" (call advice). Checked November 3, 2026.