List of The Fastest Growing Counties in the United States (2010 to 2022) |
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| Map Key | County Name | Metro Area/Region | Population (2022) | Population Growth Rate |
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| Hays County, Texas | Metro Austin | 158,464 | 53.44% |
| Dallas County, Iowa | Des Moines-Ames Area | 66,997 | 50.72% |
| Comal County, Texas | Metro San Antonio | 108,985 | 48.89% |
| Osceola County, Florida | Metro Orlando | 272,355 | 44.65% |
| Williamson County, Texas | Metro Austin | 426,296 | 44.08% |
| Saint Johns County, Florida | Metro Jacksonville | 191,495 | 43.88% |
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| Forsyth County, Georgia | Metro Atlanta | 177,103 | 43.17% |
| Kaufman County, Texas | Metro Dallas-Fort Worth | 103,385 | 40.6% |
| Fort Bend County, Texas | Metro Houston | 587,666 | 40.56% |
| Sumter County, Florida | Metro Orlando | 94,240 | 38.89% |
| Rockwall County, Texas | Metro Dallas-Fort Worth | 78,749 | 37.63% |
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| Walton County, Florida | Emerald Coast Region | 55,349 | 36.81% |
| Denton County, Texas | Metro Dallas-Fort Worth | 667,934 | 36.79% |
| Montgomery County, Texas | Metro Houston | 458,339 | 36.14% |
| Collin County, Texas | Metro Dallas-Fort Worth | 788,580 | 36.06% |
| Williamson County, Tennessee | Metro Nashville | 184,225 | 35.23% |
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| Loudoun County, Virginia | Metro DC | 314,980 | 34.79% |
| Canadian County, Oklahoma | Metro Oklahoma City | 116,299 | 33.64% |
| Gallatin County, Montana | Butte-Bozeman-Helena Area | 90,339 | 32.9% |
| Broomfield County, Colorado | Metro Denver | 55,913 | 32.61% |
| Guadalupe County, Texas | Metro San Antonio | 131,945 | 31.3% |
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| Bastrop County, Texas | Metro Austin | 74,023 | 31.07% |
| Washington County, Utah | St George Utah Area | 139,484 | 30.53% |
| Horry County, South Carolina | Myrtle Beach-Florence Area | 270,943 | 30.35% |
| Weld County, Colorado | Metro Denver | 253,552 | 30.12% |
| Rutherford County, Tennessee | Metro Nashville | 263,815 | 30.04% |
| Wilson County, Tennessee | Metro Nashville | 114,618 | 29.6% |
| Lake County, Florida | Metro Orlando | 297,995 | 29.26% |
| Berkeley County, South Carolina | Charleston Area | 179,773 | 29.25% |
| Ellis County, Texas | Metro Dallas-Fort Worth | 149,712 | 28.64% |
| Benton County, Arkansas | Ft. Smith-Fayetteville-Springdale-Rogers Area | 222,028 | 28.46% |
| Johnston County, North Carolina | Metro Raleigh-Durham | 169,122 | 27.9% |
| Montgomery County, Tennessee | Clarksville-Hopkinsville Area | 173,138 | 27.7% |
| Utah County, Utah | Metro Salt Lake City | 516,571 | 27.65% |
| Brunswick County, North Carolina | Wilmington Jacksonville Area | 107,925 | 27.24% |
| Baldwin County, Alabama | Mobile Area | 183,226 | 27.16% |
| Cabarrus County, North Carolina | Metro Charlotte | 178,396 | 26.85% |
| Parker County, Texas | Metro Dallas-Fort Worth | 116,820 | 26.76% |
| Hamilton County, Indiana | Metro Indianapolis | 276,098 | 26.55% |
| Ada County, Idaho | Boise Area | 394,961 | 26.15% |
| Travis County, Texas | Metro Austin | 1,034,842 | 25.96% |
| Columbia County, Georgia | Augusta-Aiken Area | 124,665 | 25.76% |
| Deschutes County, Oregon | Bend Area | 158,884 | 25.69% |
| Jackson County, Georgia | Athens GA Area | 60,268 | 25.5% |
| Douglas County, Colorado | Metro Denver | 286,883 | 25.4% |
| Wake County, North Carolina | Metro Raleigh-Durham | 905,573 | 25.35% |
| Lancaster County, South Carolina | Metro Charlotte | 76,364 | 25.26% |
| Limestone County, Alabama | North Alabama Region | 83,313 | 25.11% |
| Boone County, Indiana | Metro Indianapolis | 56,823 | 25.02% |
| Tooele County, Utah | Metro Salt Lake City | 58,158 | 24.87% |