Percentage increase |
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| 100 Fastest-Growing U.S. Counties by Percentage Growth, July 1, 2004 to July 1, 2005 | ||||
| County | State | Population (July 1, 2005) |
Numerical change |
Percent change |
| Maricopa County | Arizona | 3,635,528 | 136,941 | 3.9 |
| Riverside County | California | 1,946,419 | 76,954 | 4.1 |
| Collin County | Texas | 659,457 | 31,031 | 4.9 |
| Lee County | Florida | 544,758 | 29,835 | 5.8 |
| Wake County | North Carolina | 748,815 | 29,082 | 4.0 |
| Will County | Illinois | 642,813 | 25,319 | 4.1 |
| Denton County | Texas | 554,642 | 23,660 | 4.5 |
| Fort Bend County | Texas | 463,650 | 21,261 | 4.8 |
| Pasco County | Florida | 429,065 | 21,019 | 5.2 |
| Loudoun County | Virginia | 255,518 | 16,193 | 6.8 |
| Montgomery County | Texas | 378,033 | 15,841 | 4.4 |
| Williamson County | Texas | 333,457 | 15,308 | 4.8 |
| Lake County | Florida | 277,035 | 15,190 | 5.8 |
| Pinal County | Arizona | 229,549 | 14,845 | 6.9 |
| St. Lucie County | Florida | 241,305 | 14,195 | 6.3 |
| Douglas County | Colorado | 249,416 | 11,865 | 5.0 |
| Marion County | Florida | 303,442 | 11,674 | 4.0 |
| Osceola County | Florida | 231,578 | 11,451 | 5.2 |
| Hamilton County | Indiana | 240,685 | 10,845 | 4.7 |
| Cherokee County | Georgia | 184,211 | 9,360 | 5.4 |
| Horry County | South Carolina | 226,992 | 9,357 | 4.3 |
| Union County | North Carolina | 162,929 | 9,209 | 6.0 |
| Weld County | Colorado | 228,943 | 8,982 | 4.1 |
| Henry County | Georgia | 167,848 | 8,909 | 5.6 |
| St. Johns County | Florida | 161,525 | 8,801 | 5.8 |
| Rutherford County | Tennessee | 218,292 | 8,553 | 4.1 |
| Washington County | Utah | 118,885 | 8,460 | 7.7 |
| Forsyth County | Georgia | 140,393 | 8,443 | 6.4 |
| Yavapai County | Arizona | 198,701 | 7,964 | 4.2 |
| Hernando County | Florida | 158,409 | 7,869 | 5.2 |
| Mohave County | Arizona | 187,200 | 7,637 | 4.3 |
| Delaware County | Ohio | 150,268 | 7,521 | 5.3 |
| Flagler | Florida | 76,410 | 7,394 | 10.7 |
| Benton County | Arkansas | 186,938 | 7,329 | 4.1 |
| Kendall County | Illinois | 79,514 | 6,810 | 9.4 |
| Deschutes County | Oregon | 141,382 | 6,764 | 5.0 |
| Canyon County | Idaho | 164,593 | 6,710 | 4.2 |
| Clay County | Florida | 171,095 | 6,708 | 4.1 |
| Williamson County | Tennessee | 153,595 | 6,603 | 4.5 |
| Paulding County | Georgia | 112,411 | 6,376 | 6.0 |
| DeSoto County | Mississippi | 137,004 | 6,300 | 4.8 |
| Baldwin County | Alabama | 162,586 | 5,898 | 3.8 |
| Douglas County | Georgia | 112,760 | 5,676 | 5.3 |
| Dorchester County | South Carolina | 112,858 | 5,654 | 5.3 |
| Montgomery County | Tennessee | 147,202 | 5,396 | 3.8 |
| Kootenai County | Idaho | 127,668 | 5,221 | 4.3 |
| Hays County | Texas | 124,432 | 5,158 | 4.3 |
| Newton County | Georgia | 86,713 | 5,089 | 6.2 |
| Scott County | Minnesota | 119,825 | 5,060 | 4.4 |
| Ellis County | Texas | 133,474 | 4,843 | 3.8 |
| Boone County | Kentucky | 106,272 | 4,841 | 4.8 |
| Spotsylvania County | Virginia | 116,549 | 4,744 | 4.2 |
| Sandoval County | New Mexico | 107,460 | 4,735 | 4.6 |
| Brunswick County | North Carolina | 89,162 | 4,572 | 5.4 |
| Rockwall County | Texas | 62,944 | 4,522 | 7.7 |
| Coweta County | Georgia | 109,903 | 4,508 | 4.3 |
| Lyon County | Nevada | 47,515 | 4,179 | 9.6 |
| Comal County | Texas | 96,018 | 4,179 | 4.6 |
| Berkeley County | West Virginia | 93,394 | 4,127 | 4.6 |
| Matanuska-Susitna Borough | Alaska | 76,006 | 3,840 | 5.3 |
| Kaufman County | Texas | 89,129 | 3,682 | 4.3 |
| Sumter County | Florida | 64,182 | 3,613 | 6.0 |
| Walton County | Georgia | 75,647 | 3,603 | 5.0 |
| Ascension Parish | Louisiana | 90,501 | 3,482 | 4.0 |
| Franklin County | Washington | 63,011 | 3,360 | 5.6 |
| Barrow County | Georgia | 59,954 | 3,298 | 5.8 |
| Sherburne County | Minnesota | 81,752 | 3,131 | 4.0 |
| Christian County | Missouri | 67,266 | 3,044 | 4.7 |
| St. Croix County | Wisconsin | 77,144 | 2,910 | 3.9 |
| Nye County | Nevada | 40,477 | 2,791 | 7.4 |
| Jackson County | Georgia | 52,292 | 2,728 | 5.5 |
| Yuba County | California | 67,153 | 2,683 | 4.2 |
| Grundy County | Illinois | 43,838 | 2,660 | 6.5 |
| Tuolumne County | California | 59,380 | 2,537 | 4.5 |
| Effingham County | Georgia | 46,924 | 2,409 | 5.4 |
| Culpeper County | Virginia | 42,530 | 2,379 | 5.9 |
| Columbia County | Florida | 64,040 | 2,330 | 3.8 |
| Dallas County | Iowa | 51,762 | 2,307 | 4.7 |
| Pike County | Pennsylvania | 56,337 | 2,296 | 4.2 |
| Boone County | Illinois | 50,483 | 2,012 | 4.2 |
| Lincoln County | Missouri | 47,727 | 1,994 | 4.4 |
| Walton County | Florida | 50,324 | 1,956 | 4.0 |
| Iron County | Utah | 38,311 | 1,889 | 5.2 |
| Lincoln County | South Dakota | 33,381 | 1,857 | 5.9 |
| Hoke County | North Carolina | 41,016 | 1,823 | 4.7 |
| Caroline County | Virginia | 25,563 | 1,563 | 6.5 |
| Scott County | Kentucky | 39,380 | 1,479 | 3.9 |
| Hendry County | Florida | 39,561 | 1,448 | 3.8 |
| Orange County | Virginia | 30,246 | 1,408 | 4.9 |
| King George County | Virginia | 20,637 | 1,295 | 6.7 |
| Kendall County | Texas | 28,607 | 1,265 | 4.6 |
| Juneau County | Wisconsin | 26,725 | 1,251 | 4.9 |
| Louisa County | Virginia | 30,020 | 1,223 | 4.2 |
| Wakulla County | Florida | 28,212 | 1,138 | 4.2 |
| Bryan County | Georgia | 28,549 | 1,076 | 3.9 |
| Currituck County | North Carolina | 23,112 | 1,057 | 4.8 |
| Fluvanna County | Virginia | 24,751 | 916 | 3.8 |
| Wasatch County | Utah | 18,974 | 840 | 4.6 |
| Spencer County | Kentucky | 15,651 | 811 | 5.5 |
| New Kent County | Virginia | 16,107 | 607 | 3.9 |