List of The Fastest Growing Counties in the United States (2010 to 2020) |
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| Map Key | County Name | Metro Area/Region | Population (2020) | Population Growth Rate |
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| Hays County, Texas | Metro Austin | 241,067 | 53.44% |
| Dallas County, Iowa | Des Moines-Ames Area | 99,678 | 50.72% |
| Comal County, Texas | Metro San Antonio | 161,501 | 48.89% |
| Lincoln County, South Dakota | Sioux Falls Area | 65,161 | 45.36% |
| Osceola County, Florida | Metro Orlando | 388,656 | 44.65% |
| Williamson County, Texas | Metro Austin | 609,017 | 44.08% |
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| Saint Johns County, Florida | Metro Jacksonville | 273,425 | 43.88% |
| Forsyth County, Georgia | Metro Atlanta | 251,283 | 43.17% |
| Madison County, Idaho | Idaho Falls-Pocatello Area | 52,913 | 40.97% |
| Kaufman County, Texas | Metro Dallas-Fort Worth | 145,310 | 40.6% |
| Fort Bend County, Texas | Metro Houston | 822,779 | 40.56% |
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| Sumter County, Florida | Metro Orlando | 129,752 | 38.89% |
| Rockwall County, Texas | Metro Dallas-Fort Worth | 107,819 | 37.63% |
| Walton County, Florida | Emerald Coast Region | 75,305 | 36.81% |
| Denton County, Texas | Metro Dallas-Fort Worth | 906,422 | 36.79% |
| Montgomery County, Texas | Metro Houston | 620,443 | 36.14% |
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| Collin County, Texas | Metro Dallas-Fort Worth | 1,064,465 | 36.06% |
| Williamson County, Tennessee | Metro Nashville | 247,726 | 35.23% |
| Loudoun County, Virginia | Metro DC | 420,959 | 34.79% |
| Canadian County, Oklahoma | Metro Oklahoma City | 154,405 | 33.64% |
| Gallatin County, Montana | Butte-Bozeman-Helena Area | 118,960 | 32.9% |
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| Broomfield County, Colorado | Metro Denver | 74,112 | 32.61% |
| Waller County, Texas | Metro Houston | 56,794 | 31.45% |
| Guadalupe County, Texas | Metro San Antonio | 172,706 | 31.3% |
| Bastrop County, Texas | Metro Austin | 97,216 | 31.07% |
| Washington County, Utah | St George Utah Area | 180,279 | 30.53% |
| Horry County, South Carolina | Myrtle Beach-Florence Area | 351,029 | 30.35% |
| Weld County, Colorado | Metro Denver | 328,981 | 30.12% |
| Rutherford County, Tennessee | Metro Nashville | 341,486 | 30.04% |
| Wilson County, Tennessee | Metro Nashville | 147,737 | 29.6% |
| Lake County, Florida | Metro Orlando | 383,956 | 29.26% |
| Berkeley County, South Carolina | Charleston Area | 229,861 | 29.25% |
| Ellis County, Texas | Metro Dallas-Fort Worth | 192,455 | 28.64% |
| Benton County, Arkansas | Ft. Smith-Fayetteville-Springdale-Rogers Area | 284,333 | 28.46% |
| Johnston County, North Carolina | Metro Raleigh–Durham | 215,999 | 27.9% |
| Montgomery County, Tennessee | Clarksville-Hopkinsville Area | 220,069 | 27.7% |
| Utah County, Utah | Metro Salt Lake City | 659,399 | 27.65% |
| Brunswick County, North Carolina | Wilmington Jacksonville Area | 136,693 | 27.24% |
| Baldwin County, Alabama | Mobile Area | 231,767 | 27.16% |
| Cabarrus County, North Carolina | Metro Charlotte | 225,804 | 26.85% |
| Parker County, Texas | Metro Dallas-Fort Worth | 148,222 | 26.76% |
| Hamilton County, Indiana | Metro Indianapolis | 347,467 | 26.55% |
| Ada County, Idaho | Boise Area | 494,967 | 26.15% |
| Travis County, Texas | Metro Austin | 1,290,188 | 25.96% |
| Columbia County, Georgia | Augusta-Aiken Area | 156,010 | 25.76% |
| Deschutes County, Oregon | Bend Area | 198,253 | 25.69% |
| Jackson County, Georgia | Athens GA Area | 75,907 | 25.5% |
| Douglas County, Colorado | Metro Denver | 357,978 | 25.4% |
| Wake County, North Carolina | Metro Raleigh–Durham | 1,129,410 | 25.35% |
| Lancaster County, South Carolina | Metro Charlotte | 96,016 | 25.26% |