| Rank | County | Population (2012) |
|---|---|---|
| 1 | Laramie County, Wyoming | 94,483 |
| 2 | Natrona County, Wyoming | 78,621 |
| 3 | Campbell County, Wyoming | 47,874 |
| 4 | Sweetwater County, Wyoming | 45,267 |
| 5 | Fremont County, Wyoming | 41,110 |
| 6 | Albany County, Wyoming | 37,276 |
| 7 | Sheridan County, Wyoming | 29,596 |
| 8 | Park County, Wyoming | 28,702 |
| 9 | Teton County, Wyoming | 21,675 |
| 10 | Uinta County, Wyoming | 21,025 |
| 11 | Lincoln County, Wyoming | 17,961 |
| 12 | Carbon County, Wyoming | 15,666 |
| 13 | Converse County, Wyoming | 14,008 |
| 14 | Goshen County, Wyoming | 13,636 |
| 15 | Big Horn County, Wyoming | 11,794 |
| 16 | Sublette County, Wyoming | 10,368 |
| 17 | Platte County, Wyoming | 8,756 |
| 18 | Johnson County, Wyoming | 8,615 |
| 19 | Washakie County, Wyoming | 8,464 |
| 20 | Crook County, Wyoming | 7,155 |
| 21 | Weston County, Wyoming | 7,082 |
| 22 | Hot Springs County, Wyoming | 4,822 |
| 23 | Niobrara County, Wyoming | 2,456 |
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