Wyoming counties by area
Official, comparable measurements for 23 counties and county equivalents.
- 2,004.4–2,238.7 mi²
- 2,398–2,854.5 mi²
- 3,137–4,154.2 mi²
- 4,255–5,340.5 mi²
- 6,939–10,427 mi²
- 0.89–2.3 per mi²
- 2.8–3.8 per mi²
- 4–4.5 per mi²
- 5.2–10 per mi²
- 10–38 per mi²
Understanding Wyoming’s county areas
The land-area range runs from Hot Springs County at 2,004.4 mi² to Sweetwater County at 10,427 mi². The largest has 5.2 times the land area of the smallest and accounts for 10.7% of the combined county land in Wyoming. Compare with every state’s largest county.
The median county-equivalent land area is 3,996.8 mi², above the national median of 604.5 mi². The median describes the middle of the county size distribution; it does not describe how people or development are distributed. A state with a few very large counties can have a much smaller median than its largest entry suggests.
Where water changes the picture
Teton County has the most assigned water area, at 220.4 mi². It also has the highest water share, with water making up 5.2% of its total area. Water area and water percentage answer different questions: the first measures an amount, while the second measures the mix of land and water.
Across all 23 entries, water accounts for 0.7% of the combined total area. This is calculated from the summed land and water measurements, rather than averaging county percentages, which would give each small and large county equal weight.
Where people live
An estimated 588,753 people lived in Wyoming on July 1, 2025 (+2.1% since 2020), or 0.2% of the national total in this dataset. Laramie County is the most populous county equivalent, with 102,938 residents — 17.5% of the state. The largest by land, Sweetwater County, has 41,267.
Across the state there are 6.1 people per square mile of land. County densities range from 38 in Laramie County to 0.89 in Niobrara County; the median county equivalent has 4.1. Switch the map above to density to see where the state’s population concentrates.
Compare the largest and smallest county equivalents in Wyoming to see land, water, and total area on the same scale.
These calculations use the 2026 Census county records listed below. County-equivalent boundaries vary between states; area alone does not measure population, density, or usable land. See coverage and calculation rules.
Complete area table
Sorted from largest to smallest land area.
| # | County / equivalent | Land | Water | Water share | Population | Per mi² |
|---|---|---|---|---|---|---|
| 1 | Sweetwater CountyGEOID 56037 | 10,427 mi² | 64.2 mi² | 0.6% | 41,267 | 4 |
| 2 | Fremont CountyGEOID 56013 | 9,183.6 mi² | 82.1 mi² | 0.9% | 39,464 | 4.3 |
| 3 | Carbon CountyGEOID 56007 | 7,897.7 mi² | 66.2 mi² | 0.8% | 14,013 | 1.8 |
| 4 | Park CountyGEOID 56029 | 6,939 mi² | 26.1 mi² | 0.4% | 31,171 | 4.5 |
| 5 | Natrona CountyGEOID 56025 | 5,340.5 mi² | 35.1 mi² | 0.7% | 80,526 | 15 |
| 6 | Sublette CountyGEOID 56035 | 4,886.5 mi² | 49.2 mi² | 1% | 8,929 | 1.8 |
| 7 | Campbell CountyGEOID 56005 | 4,802.1 mi² | 4.3 mi² | 0.1% | 48,145 | 10 |
| 8 | Albany CountyGEOID 56001 | 4,274.2 mi² | 34.6 mi² | 0.8% | 38,558 | 9 |
| 9 | Converse CountyGEOID 56009 | 4,255 mi² | 10.1 mi² | 0.2% | 13,824 | 3.2 |
| 10 | Johnson CountyGEOID 56019 | 4,154.2 mi² | 20.4 mi² | 0.5% | 8,908 | 2.1 |
| 11 | Lincoln CountyGEOID 56023 | 4,075.3 mi² | 19.3 mi² | 0.5% | 21,180 | 5.2 |
| 12 | Teton CountyGEOID 56039 | 3,996.8 mi² | 220.4 mi² | 5.2% | 23,333 | 5.8 |
| 13 | Big Horn CountyGEOID 56003 | 3,137 mi² | 21.3 mi² | 0.7% | 12,024 | 3.8 |
| 14 | Crook CountyGEOID 56011 | 2,854.5 mi² | 10.9 mi² | 0.4% | 7,852 | 2.8 |
| 15 | Laramie CountyGEOID 56021 | 2,685.9 mi² | 1.7 mi² | 0.1% | 102,938 | 38 |
| 16 | Niobrara CountyGEOID 56027 | 2,626 mi² | 1.9 mi² | 0.1% | 2,341 | 0.89 |
| 17 | Sheridan CountyGEOID 56033 | 2,523.4 mi² | 3.1 mi² | 0.1% | 33,241 | 13 |
| 18 | Weston CountyGEOID 56045 | 2,398 mi² | 2 mi² | 0.1% | 6,840 | 2.9 |
| 19 | Washakie CountyGEOID 56043 | 2,238.7 mi² | 4 mi² | 0.2% | 7,597 | 3.4 |
| 20 | Goshen CountyGEOID 56015 | 2,225.6 mi² | 6.6 mi² | 0.3% | 12,640 | 5.7 |
| 21 | Uinta CountyGEOID 56041 | 2,081.7 mi² | 6.4 mi² | 0.3% | 20,728 | 10 |
| 22 | Platte CountyGEOID 56031 | 2,081.5 mi² | 29.4 mi² | 1.4% | 8,634 | 4.1 |
| 23 | Hot Springs CountyGEOID 56017 | 2,004.4 mi² | 2 mi² | 0.1% | 4,600 | 2.3 |