What is 650 Area Code?

The 650 area code is assigned to the San Francisco Peninsula in California, primarily serving San Mateo County and a portion of northern Santa Clara County. It was established in 1997 as a split from the 415 area code. Today, area code 650 is home to over 40,000 tech companies and startups such as Meta, Y Combinator, Google, etc.

  • State: California 
  • Major Cities: San Mateo, Palo Alto, Redwood City 
  • Time Zone: Pacific (GMT -08:00) 
  • Established: 1997 
  • Overlay Area Code: None 
  • Region Population: Nearly 5.3 million 
  • Primary Uses: Business, Residential

Regions Covered by 650 Area Code

The area code 650 primarily covers the San Francisco Peninsula. Regions within this area code include:

San Mateo County
  • Atherton
  • Belmont
  • Broadmoor
  • Burlingame
  • Colma
  • Daly City
  • East Palo Alto
  • El Granada
  • Emerald Lake Hills
  • Foster City
  • Half Moon Bay
  • Highlands-Baywood Park
  • Hillsborough
  • King's Mountain
  • La Honda
  • Ladera
  • Loma Mar
  • Los Trancos Woods
  • Middleton Tract
  • Menlo Park
  • 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
San Francisco County
  • San Francisco
Santa Clara County
  • Los Altos
  • Los Altos Hills
  • Loyola
  • Mountain View
  • Palo Alto
  • Stanford
  • Sunnyvale

Population & Demographics of 650 Area Code

The 650 area code location serves a key portion of the San Francisco Bay Area, which is one of the most economically vital and highly educated regions in the United States. The area's population is a diverse mix, with a significant presence of Asian and Hispanic or Latino residents.

The 650 area code is a magnet for startups. Its proximity to Stanford University and a dense network of venture capital firms creates a fertile ecosystem for new businesses. Organizations like Y Combinator, a prominent startup accelerator, are also based in the area, further cementing its role as a startup hub

The median household income in San Mateo County is $151,485, making it one of the most affluent counties. This high level of income and a strong, highly skilled labor force present a lucrative market for businesses, especially those in the technology and professional services sectors.

650 Area Code Time Zone

The 650 area code is located in the Pacific Time Zone (PT). The region operates on UTC–8 (standard) and UTC–7 (daylight saving), shifting in March and November. This time zone is advantageous for both national and global business operations.

The Pacific Time Zone allows businesses to get a head start on the East Coast workday. It also provides a significant window for communication with the rest of the U.S. in the afternoon. In addition, it offers excellent alignment with Asia in the morning and a slight overlap with European markets in the late afternoon.