This is unchanged from the previous estimate.
Niobrara County had the 23rd largest population in Wyoming in 2021.
The US Census Bureau found more than 73 percent of counties in the US saw a natural decrease in population in 2021. This is up from a 55.5 percent increase in 2020.
The Midwest suffered the most sustained population decreases, with many counties along the US East Coast and through the Rocky Mountains seeing increases.
The US population continues to grow, though at a slower rate than before.
Wyoming Counties By Population Change from 2020 to 2021
| County | 2020 Estimated Population | 2021 Estimated Population | % Change in Population From Year to Year |
|---|---|---|---|
| Lincoln County | 19,674 | 20,153 | 2.4% |
| Sheridan County | 30,996 | 31,646 | 2.1% |
| Johnson County | 8,459 | 8,623 | 1.9% |
| Crook County | 7,178 | 7,315 | 1.9% |
| Park County | 29,656 | 30,108 | 1.5% |
| Big Horn County | 11,467 | 11,632 | 1.4% |
| Albany County | 37,079 | 37,608 | 1.4% |
| Carbon County | 14,499 | 14,649 | 1% |
| Teton County | 23,347 | 23,575 | 1% |
| Uinta County | 20,441 | 20,635 | 0.9% |
| Platte County | 8,623 | 8,699 | 0.9% |
| Washakie County | 7,658 | 7,705 | 0.6% |
| Fremont County | 39,177 | 39,336 | 0.4% |
| Goshen County | 12,503 | 12,537 | 0.3% |
| Laramie County | 100,690 | 100,863 | 0.2% |
| Niobrara County | 2,439 | 2,438 | 0% |
| Sublette County | 8,723 | 8,697 | -0.3% |
| Converse County | 13,724 | 13,672 | -0.4% |
| Hot Springs County | 4,622 | 4,597 | -0.5% |
| Natrona County | 80,229 | 79,555 | -0.8% |
| Weston County | 6,809 | 6,745 | -0.9% |
| Sweetwater County | 42,158 | 41,614 | -1.3% |
| Campbell County | 47,116 | 46,401 | -1.5% |
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