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Area code 650

Area code 650 Palo Alto, California

Area code 650 is in California, with numbers assigned in Palo Alto, San Mateo, Mountain View and 12 more places. It’s 9:10 PM there now.

State
California41 area codes in California
Time zone
Pacific9:10 PM there now
Exchanges
71615 places
Overlay
NoneThe only code for its area
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Where area code 650 is

Numbers in 650 are assigned to 15 places in 3 counties: San Mateo County, Santa Clara County and San Francisco County.

Palo Alto has the most, 20% of the exchanges; the rest are spread across 14 other places.

  • Palo Alto145
  • San Mateo126
  • Mountain View93
  • South San Francisco89
  • Redwood City65
  • San Carlos44
  • Los Altos28
  • Millbrae24
  • San Francisco22
  • Half Moon Bay21
  • Pacifica18
  • Woodside14
  • Pescadero11
  • La Honda9
  • Moss Beach7

Phone companies in 650

716 blocks of numbers in 650 are held by 33 phone companies. The most belong to AT&T (272), T-Mobile (71) and AT&T Mobility (59).

A mix: about 23% wireless, 39% local phone and cable and 38% other carriers, including internet phone services.

A block’s holder is the company it was first assigned to; numbers can move to other carriers since.

History and overlays

650 went into service in 1997, added to the area of 415.

56 new exchanges were assigned since 2021, the latest in September 2026.

Calling 650

It’s 9:10 PM Pacific time in 650 right now.

From elsewhere in the U.S., dial 1, 650 and the 7-digit number.

Nearby area codes

California has 41 area codes: 209, 213, 279, 310, 323, 341, 350, 357, 369, 408, 415, 424, 442, 510, 530, 559, 562, 619, 626, 628, 650, 657, 661, 669, 707, 714, 738, 747, 760, 805, 818, 820, 831, 837, 840, 858, 909, 916, 925, 949 and 951.

From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.

Map of the 650 area code

Map of the 650 area code around Palo Alto, San Mateo and Mountain View, California.

Interactive map © OpenStreetMap contributors

Cities on the map

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Questions about 650

Where is area code 650?

In California, covering Palo Alto, San Mateo and Mountain View and other places across 3 counties.

What time zone is 650 in?

Pacific time. It was 9:10 PM there when this page loaded.

Is 650 an overlay?

No. 650 is the only area code for its area right now.

Which phone companies have 650 numbers?

33 companies hold blocks; the most belong to AT&T, T-Mobile and AT&T Mobility. About 23% of blocks are wireless.

Is 650 running out of numbers?

Not on record. 56 new exchanges have been assigned since 2021.