| County | Rank | Change (2020) ↓ | 2025 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Crook County | 1 | 10.59% | 7,938 | 7,178 |
| Lincoln County | 2 | 8.34% | 21,298 | 19,658 |
| Sheridan County | 3 | 8.02% | 33,487 | 31,000 |
| Sublette County | 4 | 7.64% | 9,403 | 8,736 |
| Big Horn County | 5 | 7.07% | 12,296 | 11,484 |
| Park County | 6 | 5.14% | 31,195 | 29,669 |
| Johnson County | 7 | 4.39% | 8,839 | 8,467 |
| Albany County | 8 | 3.51% | 38,415 | 37,112 |
| Fremont County | 9 | 2.83% | 40,313 | 39,202 |
| Campbell County | 10 | 2.61% | 48,376 | 47,147 |
| Hot Springs County | 11 | 2.51% | 4,737 | 4,621 |
| Uinta County | 12 | 1.58% | 20,781 | 20,457 |
| Goshen County | 13 | 1.11% | 12,654 | 12,515 |
| Converse County | 14 | 1.1% | 13,897 | 13,746 |
| Laramie County | 15 | 0.66% | 101,390 | 100,730 |
| Natrona County | 16 | 0.6% | 80,777 | 80,299 |
| Washakie County | 17 | 0.33% | 7,682 | 7,657 |
| Teton County | 18 | -1.18% | 23,102 | 23,379 |
| Weston County | 19 | -1.58% | 6,708 | 6,816 |
| Sweetwater County | 20 | -2.84% | 40,999 | 42,197 |
| Platte County | 21 | -3.44% | 8,334 | 8,631 |
| Niobrara County | 22 | -3.59% | 2,366 | 2,454 |
| Carbon County | 23 | -4.02% | 13,926 | 14,509 |
Wyoming's counties show varied growth patterns from 2020 to 2025. Crook County leads with 10.59% annualized growth, followed by Lincoln County (8.34%) and Sheridan County (8.02%). The largest counties are Laramie County (101,390), Natrona County (80,777), and Campbell County (48,376). Of the 23 counties in Wyoming, 17 are growing while 6 have experienced population decline. Overall, counties averaged 2.23% annualized growth, with total population growing by 1.95% annually.