COUNTY · CO
Costilla County, Colorado
Costilla County is a county in Colorado with FIPS code 08023 and an estimated population of 3,628 (Census 2023), 55th largest of 64 in the state.
County facts
- Name
- Costilla County
- State
- Colorado
- Type
- county
- FIPS code
- 08023
- State FIPS
- 08
- Population (2023)
- 3,628
- Change since 2020
- +3.6%
- State rank
- 55 of 64
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Costilla County?
Costilla County, Colorado has the five-digit FIPS code 08023: 08 for the state and 023 for the county.
What state is Costilla County in?
Costilla 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.