Explore Wyoming county boundaries, county seats and 2020 Census population counts, with a labeled map and a full alphabetical county list.
Wyoming has 23 counties. The county map connects mountain regions, basins and plains with county seats such as Cheyenne, Casper, Gillette, Green River and Lander. The guide includes labeled county boundaries, 2020 Census population figures and a complete alphabetical county list.
| Feature | Details |
|---|---|
| State Name | Wyoming |
| State Abbreviation | WY |
| Capital City | Cheyenne |
| County-level Areas | 23 counties |
| Population (2020 Census) | 576,851 |
| Land Area (2020 Census) | 97,088.55 square miles |
Wyoming counties can cover large geographic areas with relatively small populations. The largest county by land area need not be the most populous. Another common point of confusion is Laramie: the city of Laramie is in Albany County, while Laramie County’s county seat is Cheyenne.
Population comparisons below use the April 1, 2020 Census. They are census counts, not current estimates. Using the same year makes the county comparisons consistent.
| County / Equivalent | County Seat / Government Center | Population — 2020 Census |
|---|---|---|
| Laramie County | Cheyenne | 100,512 |
| Natrona County | Casper | 79,955 |
| Campbell County | Gillette | 47,026 |
| Sweetwater County | Green River | 42,272 |
| Fremont County | Lander | 39,234 |
| Albany County | Laramie | 37,066 |
| Sheridan County | Sheridan | 30,921 |
The complete alphabetical list below includes all 23 county-level areas, including the 16 not shown in this population table.
| Format | Download |
|---|---|
| PNG Map | Download Now |
| PDF Printable | Download Now |
| SVG Editable | Download Now |
| GIS Shapefile (ZIP) | Download Now |
❓ How many counties are in Wyoming?
Wyoming has 23 counties. All county-level areas are identified on this map.
❓ What is the capital of Wyoming?
Cheyenne is the state capital.
❓ Which county had the largest population in the 2020 Census?
Laramie County had 100,512 residents in the 2020 Census. Its county seat or government center is Cheyenne.
❓ What is the largest county in Wyoming by land area?
Sweetwater County has the greatest land area in the Census boundary dataset. Land area and population rankings measure different things.
❓ What county is Cheyenne in?
Cheyenne is Wyoming’s capital and the county seat of Laramie County.
❓ Is the city of Laramie in Laramie County?
No. The city of Laramie is in Albany County and is its county seat. Cheyenne is the county seat of Laramie County.
❓ What county is Casper in?
Casper is the county seat of Natrona County.
❓ What county is Gillette in?
Gillette is in Campbell County and serves as its county seat.
❓ How should I use this county map?
Use a county name or a known county seat to identify the area, then follow its boundary to neighboring counties. City limits and county boundaries are different. This reference map does not show property lines or road navigation.
Boundaries and county names are from U.S. Census Bureau TIGERweb, January 1, 2026 vintage. Population and state land-area figures use 2020 Census geography and counts. County seats and state geography were checked against Wyoming county and county-seat directory. The 2020 population figures are not presented as current estimates.
