650 Area Code — California
650 is a North American Numbering Plan area code for California, the United States. It covers about 951,432 people in 25 towns and 51 ZIP codes, including San Mateo, Daly City and Redwood City.
| Field | Value |
|---|---|
| Area code | 650 |
| Country | United States (+1) |
| State / province | California |
| Type | Standalone (no other NANP code covers the same towns) |
| Time zone | Pacific |
| Population covered | 951,432 |
| Towns covered | 25 |
| ZIP codes | 51 |
| Approx. centre | 37.478, -122.272 |
Where area code 650 is used
Area code 650 is assigned to California, the United States, inside the North American Numbering Plan. Numbers in the code are written (650) NXX-XXXX at home and +1 650 NXX-XXXX when dialled from outside Canada and the United States. Since the NANP moved to 10-digit dialling you must always include the area code, even for a local call.
Towns and cities in area code 650
The 25 towns below are the largest in the 650 footprint, ranked by population. Every one of them links to its own page with the full list of area codes and ZIP codes for that town.
| Town | County | Population | ZIP codes |
|---|---|---|---|
| San Mateo | San Mateo County | 139,927 | 5 |
| Daly City | San Mateo County | 109,406 | 4 |
| Redwood City | San Mateo County | 108,913 | 5 |
| Palo Alto | Santa Clara County | 96,570 | 6 |
| Mountain View | Santa Clara County | 84,858 | 6 |
| South San Francisco | San Mateo County | 64,761 | 2 |
| Los Altos | Santa Clara County | 43,078 | 3 |
| Burlingame | San Mateo County | 43,025 | 2 |
| San Bruno | San Mateo County | 42,728 | 1 |
| Menlo Park | San Mateo County | 40,721 | 2 |
| Pacifica | San Mateo County | 37,274 | 1 |
| San Carlos | San Mateo County | 30,447 | 1 |
Counties covered
| County | ZIP codes |
|---|---|
| San Mateo County | 35 |
| Santa Clara County | 16 |
Nearby area codes
How to dial area code 650
- Within North America: 650 + 7-digit number (650-NXX-XXXX). The leading 1 is optional on a mobile phone and required on most landlines for long-distance.
- From abroad: your country's international prefix, then 1, then 650, then the 7-digit number — for example 00 1 650 NXX-XXXX from most of Europe.
Frequently asked questions
What area code is 650?
650 is a North American Numbering Plan area code assigned to California, the United States. It covers about 951,432 people in 25 towns.
Is 650 a US or Canadian area code?
650 is a United States area code. Canada and the United States share the +1 country code, so both are part of the same numbering plan.
What time zone is area code 650 in?
Area code 650 is in the Pacific time zone.
Do I have to dial 10 digits?
Yes. Every NANP call now requires the area code plus the seven-digit number, even for a local call.