Wyoming Counties Directory & Interactive Map
Complete official guide to all 23 counties in Wyoming (WY). Explore 2024 US Census population estimates, county seats, FIPS codes, land areas, and interactive mapping tools powered by GeoMap Suite.
Wyoming County Breakdown
Showing 7 of 7 documented counties and seats.
County Name | FIPS | County Seat | Population (Census) | Land Area | Quick Tool |
|---|---|---|---|---|---|
| Laramie County (Cheyenne) | 56021 | Cheyenne | 100,512 | 2,686 sq mi | Lookup |
| Natrona County (Casper) | 56025 | Casper | 79,955 | 5,340 sq mi | Lookup |
| Campbell County (Gillette) | 56005 | Gillette | 47,026 | 4,797 sq mi | Lookup |
| Sweetwater County (Rock Springs) | 56037 | Green River | 42,272 | 10,426 sq mi | Lookup |
| Fremont County (Riverton/Lander) | 56013 | Lander | 39,234 | 9,183 sq mi | Lookup |
| Albany County (Laramie) | 56001 | Laramie | 37,066 | 4,274 sq mi | Lookup |
| Teton County (Jackson) | 56039 | Jackson | 23,331 | 3,995 sq mi | Lookup |
Geographic Structure of Wyoming Counties
County Administration & Governance
In Wyoming, county governments manage vital public infrastructure, tax assessments, law enforcement, judicial courts, election administration, and public records. The county seat (Cheyenne and other municipal headquarters) houses the primary courthouse, commissioners, and sheriff’s department.
All Wyoming counties carry a unique 5-digit Federal Information Processing Standard (FIPS) code, where the first two digits (56) designate the state and the remaining three digits identify each specific jurisdiction.
Geographic & Demographic Highlights
- Most Populous County:Laramie County (Cheyenne) (100,512 residents)
- Largest by Land Area:Sweetwater County (Rock Springs) (10,426 sq mi)
- State Capital:Cheyenne
- 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.