| Rank | County | Land Area |
|---|---|---|
| 1 | Sweetwater County, Wyoming | 10,426.6 |
| 2 | Fremont County, Wyoming | 9,183.8 |
| 3 | Carbon County, Wyoming | 7,897.6 |
| 4 | Park County, Wyoming | 6,942.1 |
| 5 | Natrona County, Wyoming | 5,340.4 |
| 6 | Sublette County, Wyoming | 4,886.5 |
| 7 | Campbell County, Wyoming | 4,802.7 |
| 8 | Albany County, Wyoming | 4,273.8 |
| 9 | Converse County, Wyoming | 4,254.9 |
| 10 | Johnson County, Wyoming | 4,154.1 |
| 11 | Lincoln County, Wyoming | 4,076.1 |
| 12 | Teton County, Wyoming | 3,995.4 |
| 13 | Big Horn County, Wyoming | 3,137.1 |
| 14 | Crook County, Wyoming | 2,854.4 |
| 15 | Laramie County, Wyoming | 2,685.9 |
| 16 | Niobrara County, Wyoming | 2,626.0 |
| 17 | Sheridan County, Wyoming | 2,524.0 |
| 18 | Weston County, Wyoming | 2,398.1 |
| 19 | Washakie County, Wyoming | 2,238.6 |
| 20 | Goshen County, Wyoming | 2,225.4 |
| 21 | Platte County, Wyoming | 2,084.2 |
| 22 | Uinta County, Wyoming | 2,081.3 |
| 23 | Hot Springs County, Wyoming | 2,004.1 |
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