San Mateo County

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San Mateo County, County in San Francisco Bay Area, California

The county spans 744 square miles across the San Francisco Peninsula, including 293 square miles of water and 448 square miles of land territory.

San Mateo County originated from a division of San Francisco County in 1856, with Redwood City designated as the administrative center in 1857.

The area maintains 22 parks, trails, and historic sites, including Memorial Park and Fitzgerald Marine Reserve, preserving natural and cultural heritage.

Transportation networks include Caltrain and BART rail services, SamTrans bus routes, and three major highways connecting the northern and southern parts.

The county houses the San Francisco International Airport and numerous technology companies, contributing to its median household income of $128,091 in 2020.

Location: California

Inception: 1856

Capital city: Redwood City

Part of: San Francisco–San Mateo–Redwood City metropolitan division

Shares border with: Alameda County, San Francisco County, Santa Clara County, Santa Cruz County

Phone: +16503634000

Website: http://smcgov.org

GPS coordinates: 37.44000,-122.36000

Latest update: May 26, 2025 19:17

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Administrative divisions
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