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.
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)
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