COUNTY · CO
Alamosa County, Colorado
Alamosa County is a county in Colorado with FIPS code 08003 and an estimated population of 16,655 (Census 2023), 30th largest of 64 in the state.
County facts
- Name
- Alamosa County
- State
- Colorado
- Type
- county
- FIPS code
- 08003
- State FIPS
- 08
- Population (2023)
- 16,655
- Change since 2020
- +1.7%
- State rank
- 30 of 64
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Alamosa County?
Alamosa County, Colorado has the five-digit FIPS code 08003: 08 for the state and 003 for the county.
What state is Alamosa County in?
Alamosa County is in Colorado.
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.