COUNTY · CA
Alameda County, California
Alameda County is a county in California with FIPS code 06001 and an estimated population of 1,622,188 (Census 2023), 7th largest of 58 in the state.
County facts
- Name
- Alameda County
- State
- California
- Type
- county
- FIPS code
- 06001
- State FIPS
- 06
- Population (2023)
- 1,622,188
- Change since 2020
- -3.5%
- State rank
- 7 of 58
Population is the Census Bureau’s Vintage 2023 estimate.
Major cities in Alameda County
Other counties in California
Questions
What is the FIPS code for Alameda County?
Alameda County, California has the five-digit FIPS code 06001: 06 for the state and 001 for the county.
What state is Alameda County in?
Alameda County is in California.
How do I know if an address is in this county?
Use the address lookup. ZIP codes and city names can cross county lines, so an address is the reliable check.
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.