This Is America's Fastest Growing County

20. Rockwall County, Texas
> 2020 population: 107,819
> 2010 population: 78,337
> Pct. Change in population: 37.6%

19. Sumter County, Florida
> 2020 population: 129,752
> 2010 population: 93,420
> Pct. Change in population: 38.9%

18. Stark County, North Dakota
> 2020 population: 33,646
> 2010 population: 24,199
> Pct. Change in population: 39.0%

17. Nantucket County, Massachusetts
> 2020 population: 14,255
> 2010 population: 10,172
> Pct. Change in population: 40.1%

16. Fort Bend County, Texas
> 2020 population: 822,779
> 2010 population: 585,375
> Pct. Change in population: 40.6%