650
Covers San Mateo County and parts of Santa Clara County, California
City facts
Palo Alto area code
Area code for San Mateo County and parts of Santa Clara County, California: history, overlays and how to dial.
650
Palo Alto uses area code 650.
About area code 650
How to call a number in Palo Alto
Inside the US
1 (650) 555-0123Dial 1, the area code, then the seven-digit number.Local call
555-0123Many areas now require the area code for local calls too; if a seven-digit call fails, add it.From outside the US
+1 650 555 0123Use your country's exit code or +, then 1 for the US.Palo Alto is on Pacific Time (PT); check the time before calling from another zone.
Other cities that share 650
Nearby area codes
| Area code | Used in | Distance |
|---|---|---|
| 408 | Sunnyvale | 7 mi |
| 669 | Sunnyvale | 7 mi |
| 925 | Pleasanton | 22 mi |
| 510 | Richmond | 37 mi |
| 341 | Richmond | 37 mi |
| 707 | Vallejo | 48 mi |
| 369 | Vallejo | 48 mi |
| 831 | Salinas | 58 mi |
Palo Alto quick facts
Palo Alto was incorporated on April 16, 1894. It is named for El Palo Alto, a tall coast redwood.
Incorporated1894April 16, 1894
CountySanta Clara CountyCalifornia
Area code650Population67,231Census ACS estimateZIP codes594022, 94301, 94303…Elevation30 ft9 m
Time zonePacific TimePT
Dates, namesake and elevation from Wikipedia: Palo Alto, California and Wikidata (checked 2026-11-08); population and ZIP codes from the U.S. Census Bureau.
Questions
What area code is Palo Alto?
Palo Alto uses area code 650.
What time zone is area code 650 in?
Palo Alto is on Pacific Time (PT).
What other cities use area code 650?
Other cities in this network that share 650 include Sunnyvale, San Mateo.
Sources: Area code 650 (Wikipedia) and Wikidata, checked 2026-11-08. Numbering plans change; the North American Numbering Plan Administrator is the official record.