Alameda County is a county located in the U.S. state of California. As of the 2020 census, the population was 1,682,353, making it the 7th-most populous county in the state and 21st most populous nationally. The county seat is Oakland. Alameda County is in the San Francisco Bay Area, occupying much of the East Bay region. The Spanish word alameda means either "a grove of poplars...or a tree lined street". The name was originally used to describe the Arroyo de la Alameda; the willow and sycamore trees along the banks of the river reminded the early Spanish explorers of a road lined with trees. Although a strict translation to English might be "Poplar Grove Creek", the name of the principal stream that flows through the county is now simply "Alameda Creek". Alameda County is part of the San Francisco–Oakland–Berkeley, CA Metropolitan Statistical Area, and the San Jose–San Francisco–Oakland, CA Combined Statistical Area.

Country: United States
State: California
Region: San Francisco Bay Area
Incorporated: March 25, 1853
Named for: Rancho Arroyo de la Alameda (also see Alameda Creek)
County seat: Oakland
Largest city: Oakland (population), Fremont (area)
Type: Council–CAO
Body: Alameda County Board of Supervisors
President: Nate Miley
Vice President: David Haubert
County Administrator's Office: Susan S. Muranishi
Population (2020): 1,682,353
Time zone: Pacific Time Zone (UTC-8)
Summer (DST): Pacific Daylight Time (UTC-7)
Area codes: 510, 341, 925
FIPS code: 06-001
Congressional districts: 10th, 12th, 14th, 17th
Website: [www.acgov.org ACgov.org]
Twitter profile: AlamedaCounty
Wikidata description: county in California, United States
Wikidata id: Q107146
Wikidata label: Alameda County
Wikidata aliases: Array
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