Colorado Counties, Demographics & Geography
Complete official guide to all 64 counties in Colorado (CO). Explore 2024 US Census population estimates, county seats, FIPS codes, land areas, and interactive mapping tools powered by GeoMap Suite.
Colorado County Breakdown
Showing 9 of 9 documented counties and seats.
County Name | FIPS | County Seat | Population (Census) | Land Area | Quick Tool |
|---|---|---|---|---|---|
| El Paso County | 08041 | Colorado Springs | 730,395 | 2,126 sq mi | Lookup |
| City and County of Denver | 08031 | Denver | 715,522 | 153 sq mi | Lookup |
| Arapahoe County | 08005 | Littleton | 655,070 | 798 sq mi | Lookup |
| Jefferson County | 08059 | Golden | 582,912 | 764 sq mi | Lookup |
| Adams County | 08001 | Brighton | 519,572 | 1,168 sq mi | Lookup |
| Larimer County | 08069 | Fort Collins | 359,066 | 2,596 sq mi | Lookup |
| Douglas County | 08035 | Castle Rock | 357,978 | 840 sq mi | Lookup |
| Boulder County | 08013 | Boulder | 330,758 | 726 sq mi | Lookup |
| Weld County | 08123 | Greeley | 328,981 | 3,987 sq mi | Lookup |
Geographic Structure of Colorado Counties
County Administration & Governance
In Colorado, county governments manage vital public infrastructure, tax assessments, law enforcement, judicial courts, election administration, and public records. The county seat (Denver and other municipal headquarters) houses the primary courthouse, commissioners, and sheriff’s department.
All Colorado counties carry a unique 5-digit Federal Information Processing Standard (FIPS) code, where the first two digits (08) designate the state and the remaining three digits identify each specific jurisdiction.
Geographic & Demographic Highlights
- Most Populous County:El Paso County (730,395 residents)
- Largest by Land Area:Weld County (3,987 sq mi)
- State Capital:Denver
- Census Bureau Region:West United States
Demographic calculations derive from the United States Census Bureau 2024 Population Estimates Program (PEP) and TIGER/Line geographic boundary files.