Area code 650
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Through Telephone
Prior to October 2021, area code 650 had telephone numbers assigned for the central office code 988. In 2020, 988 was designated nationwide as a dialing code for the National Suicide Prevention Lifeline, which created a conflict for exchanges that permit seven-digit dialing. This area code was therefore scheduled to transition to ten-digit dialing by October 24, 2021.
Service area
San Mateo County
- Atherton
- Belmont
- Broadmoor
- Burlingame
- Colma
- Daly City (small portion in 415)
- East Palo Alto
- El Granada
- Emerald Lake Hills
- Foster City
- Half Moon Bay
- Highlands-Baywood Park
- Hillsborough
- Kings Mountain
- La Honda
- Ladera
- Loma Mar
- Los Trancos Woods
- Menlo Park
- Middleton Tract
- Millbrae
- Montara
- Moss Beach
- North Fair Oaks
- Pacifica
- Pescadero
- Portola Valley
- Princeton-by-the-Sea
- Redwood City
- San Bruno
- San Carlos
- San Gregorio
- San Mateo
- Sky Londa
- South San Francisco
- West Menlo Park
- Woodside
Santa Clara County
- Los Altos
- Los Altos Hills
- Loyola
- Mountain View
- Palo Alto
- Stanford
- Sunnyvale (western edge)