| Area Code | 650 |
| State | California |
| Current Time in Area Code 650 | 650> PDT |
| Timezone | Pacific Daylight Time |
| Regional Market Area | Metro Bay Area |
| Population (2020) | 764442 |
| Adjacent Area Codes | 341,408,415,510,628,669,831 |
| San Mateo County |
| Burlingame |
| Daly City |
| Foster City |
| Los Altos |
| Menlo Park |
| Mountain View |
| Pacifica |
| Palo Alto |
| Redwood City |
| San Bruno |
| San Carlos |
| San Mateo |
| South San Francisco |