650 area code
Palo Alto area, Pacific Time.Area code 650 covers Palo Alto, San Mateo, Mountain View and 12 more places in California, on Pacific Time.
Right now in Palo Alto
Pacific Time (PST, UTC-8; PDT, UTC-7 in summer)
Calling hours: Every day, 8 AM to 9 PM (the federal rule)
Small talk
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Where 650 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 650 has 15. Each one's share is how many 650 numbers start there. Its biggest metro area is San Francisco-Oakland-Fremont, CA.
- Palo Alto20%
- San Mateo18%
- Mountain View13%
- South San Francisco13%
- Redwood City9%
- San Carlos-Belmont6%
- Los Altos4%
- Millbrae3%
- San Francisco3%
- Half Moon Bay3%
- Pacifica2%
Also: Woodside, Pescadero, La Honda, Moss Beach
Share of exchanges (blocks of 10,000 numbers). Source: NANPA rate center and exchange reports, November 10, 2026
When can you call a 650 number?
Sales calls to homes and cell phones have legal hours, set by the federal rule. Hold every 650 number to them, since you can't tell a work line from a personal cell.
What applies to 650Every day, 8 AM to 9 PM
- Federal (TCPA and FTC rule)Every day, 8 AM to 9 PMCalls to residential and mobile numbers. Most calls to businesses are exempt from the FTC's rule.47 CFR 64.1200(c)(1); 16 CFR 310.4(c) (opens in a new tab)
Local time comes from the area code, not from where the person is today. Mobiles keep their number when they move. Calling hours here are a guide, not legal advice. Every state's calling hours, with sources
The 650 area code
650 went into service on August 2, 1997, split off from 415. Local calls take all 10 digits.
- 1997650 starts
Source: NANPA area code database
Other California area codes
All California area codes- Stockton209350
- Los Angeles213323738
- Sacramento279916
- Compton310424
- Oakland341510
- Fresno357559
- Santa Rosa369707
- San Jose408669
- San Francisco415628
- Oceanside442760
- Chico530837
- Long Beach562
- San Diego619858
- Alhambra626
- Anaheim657714
- Bakersfield661
- Van Nuys747818
- Santa Barbara805820
- Salinas831
- Ontario840909
- Walnut Creek925
- Irvine949
- Riverside951
Calling a list of 650 numbers?
Paste it into the free phone number validator. It checks every number, finds each one's time zone and sorts the list by who you can call right now.
650 area code FAQ
What area code is 650?
650 is a California area code for Palo Alto, San Mateo, Mountain View, South San Francisco and 11 more places.
What time zone is the 650 area code in?
Pacific Time (PST, UTC-8; PDT, UTC-7 in summer).
What are the calling hours for 650 numbers?
Every day, 8 AM to 9 PM, local time, under the federal rule.
When did the 650 area code start?
On August 2, 1997. It was split from 415.
Calling 650 numbers? Reach more of them.
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