COUNTY · CO
Arapahoe County, Colorado
Arapahoe County is a county in Colorado with FIPS code 08005 and an estimated population of 656,061 (Census 2023), 3rd largest of 64 in the state.
County facts
- Name
- Arapahoe County
- State
- Colorado
- Type
- county
- FIPS code
- 08005
- State FIPS
- 08
- Population (2023)
- 656,061
- Change since 2020
- +0.1%
- State rank
- 3 of 64
Population is the Census Bureau’s Vintage 2023 estimate.
Major cities in Arapahoe County
Other counties in Colorado
Questions
What is the FIPS code for Arapahoe County?
Arapahoe County, Colorado has the five-digit FIPS code 08005: 08 for the state and 005 for the county.
What state is Arapahoe County in?
Arapahoe 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.