| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Crook County | 1 | 10.16% | 7,913 | 7,183 |
| Lincoln County | 2 | 8.74% | 21,372 | 19,654 |
| Sheridan County | 3 | 8.2% | 33,549 | 31,006 |
| Johnson County | 4 | 6.12% | 8,987 | 8,469 |
| Park County | 5 | 5.27% | 31,235 | 29,670 |
| Big Horn County | 6 | 4.83% | 12,034 | 11,480 |
| Albany County | 7 | 3.95% | 38,571 | 37,107 |
| Laramie County | 8 | 3.44% | 104,189 | 100,727 |
| Campbell County | 9 | 2.23% | 48,198 | 47,146 |
| Sublette County | 10 | 1.93% | 8,909 | 8,740 |
| Uinta County | 11 | 1.67% | 20,803 | 20,462 |
| Goshen County | 12 | 0.97% | 12,641 | 12,520 |
| Platte County | 13 | 0.85% | 8,705 | 8,632 |
| Converse County | 14 | 0.8% | 13,858 | 13,748 |
| Natrona County | 15 | 0.6% | 80,781 | 80,299 |
| Fremont County | 16 | 0.18% | 39,264 | 39,192 |
| Weston County | 17 | -0.15% | 6,810 | 6,820 |
| Teton County | 18 | -0.26% | 23,321 | 23,381 |
| Hot Springs County | 19 | -0.58% | 4,594 | 4,621 |
| Washakie County | 20 | -1.33% | 7,557 | 7,659 |
| Sweetwater County | 21 | -2.39% | 41,184 | 42,194 |
| Niobrara County | 22 | -3.43% | 2,367 | 2,451 |
| Carbon County | 23 | -3.9% | 13,942 | 14,508 |
Wyoming's counties show varied growth patterns from 2020 to 2026. Crook County leads with 1.63% annualized growth, followed by Lincoln County (1.41%) and Sheridan County (1.32%). The largest counties are Laramie County (104,189), Natrona County (80,781), and Campbell County (48,198). Of the 23 counties in Wyoming, 16 are growing while 7 have experienced population decline. Overall, counties averaged 0.34% annualized growth, with total population growing by 0.37% annually.
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