List of The Fastest Growing Counties in the United States (2000 to 2019) |
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| Map Key | County Name | Metro Area/Region | Population (2019) | Population Growth Rate |
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| Hays County, Texas | Metro Austin | 230,191 | 31.75% |
| Comal County, Texas | Metro San Antonio | 156,209 | 30.56% |
| Sumter County, Florida | Metro Orlando | 132,420 | 29.45% |
| Dallas County, Iowa | Des Moines-Ames Area | 93,453 | 29.23% |
| Osceola County, Florida | Metro Orlando | 375,751 | 28.49% |
| Williamson County, Texas | Metro Austin | 590,551 | 28.43% |
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| Saint Johns County, Florida | Metro Jacksonville | 264,672 | 28.2% |
| Forsyth County, Georgia | Metro Atlanta | 244,252 | 28.14% |
| Fort Bend County, Texas | Metro Houston | 811,688 | 27.88% |
| Lincoln County, South Dakota | Sioux Falls Area | 61,128 | 26.67% |
| Walton County, Florida | Emerald Coast Region | 74,071 | 25.69% |
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| Rockwall County, Texas | Metro Dallas-Fort Worth | 104,915 | 25.33% |
| Denton County, Texas | Metro Dallas-Fort Worth | 887,207 | 25.31% |
| Montgomery County, Texas | Metro Houston | 607,391 | 24.97% |
| Brunswick County, North Carolina | Wilmington Jacksonville Area | 142,820 | 24.78% |
| Loudoun County, Virginia | Metro DC | 413,538 | 24.48% |
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| Collin County, Texas | Metro Dallas-Fort Worth | 1,034,730 | 24.39% |
| Kaufman County, Texas | Metro Dallas-Fort Worth | 136,154 | 24.09% |
| Horry County, South Carolina | Myrtle Beach-Florence Area | 354,081 | 23.95% |
| Williamson County, Tennessee | Metro Nashville | 238,412 | 23.17% |
| Midland County, Texas | Odessa-Midland Area | 176,832 | 22.6% |
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| Washington County, Utah | St George Utah Area | 177,556 | 22.21% |
| Weld County, Colorado | Metro Denver | 324,492 | 22.09% |
| Canadian County, Oklahoma | Metro Oklahoma City | 148,306 | 22.09% |
| Berkeley County, South Carolina | Charleston Area | 227,907 | 21.97% |
| Waller County, Texas | Metro Houston | 55,246 | 21.8% |
| Lancaster County, South Carolina | Metro Charlotte | 98,012 | 21.79% |
| Gallatin County, Montana | Butte-Bozeman-Helena Area | 114,434 | 21.78% |
| Wilson County, Tennessee | Metro Nashville | 144,657 | 21.2% |
| Guadalupe County, Texas | Metro San Antonio | 166,847 | 21.17% |
| Rutherford County, Tennessee | Metro Nashville | 332,285 | 20.97% |
| Columbia County, Georgia | Augusta-Aiken Area | 156,714 | 20.84% |
| Benton County, Arkansas | Ft. Smith-Fayetteville-Springdale-Rogers Area | 279,141 | 20.71% |
| Broomfield County, Colorado | Metro Denver | 70,465 | 20.69% |
| Deschutes County, Oregon | Bend Area | 197,692 | 20.21% |
| Manatee County, Florida | Metro Sarasota | 403,253 | 19.94% |
| Lee County, Florida | Southwest Florida Region | 770,577 | 19.7% |
| Travis County, Texas | Metro Austin | 1,273,954 | 19.6% |
| York County, South Carolina | Metro Charlotte | 280,979 | 19.54% |
| Tooele County, Utah | Metro Salt Lake City | 72,259 | 19.43% |
| Johnston County, North Carolina | Metro Raleigh–Durham | 209,339 | 19.33% |
| Lake County, Florida | Metro Orlando | 367,118 | 19.09% |
| Ellis County, Texas | Metro Dallas-Fort Worth | 184,826 | 19.05% |
| Wake County, North Carolina | Metro Raleigh–Durham | 1,111,761 | 18.96% |
| Utah County, Utah | Metro Salt Lake City | 636,235 | 18.81% |
| Pinal County, Arizona | Metro Phoenix | 462,789 | 18.8% |
| Hamilton County, Indiana | Metro Indianapolis | 338,011 | 18.77% |
| Effingham County, Georgia | Savannah Area | 64,296 | 18.74% |
| Douglas County, Colorado | Metro Denver | 351,154 | 18.71% |
| Ada County, Idaho | Boise Area | 481,587 | 18.53% |