Numerical increase |
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| 100 U.S. Counties with the Largest Numerical Increase, July 1, 2004 to July 1, 2005 | ||||
| County | State | Population (July 1, 2005) |
Numerical change |
Percent change |
| Ada County | Idaho | 344,727 | 12,182 | 3.7 |
| Adams County | Colorado | 399,426 | 11,362 | 2.9 |
| Arapahoe County | Colorado | 529,090 | 6,744 | 1.3 |
| Benton County | Arkansas | 186,938 | 7,329 | 4.1 |
| Bernalillo County | New Mexico | 603,562 | 11,024 | 1.9 |
| Bexar County | Texas | 1,518,370 | 26,009 | 1.7 |
| Brazoria County | Texas | 278,484 | 7,614 | 2.8 |
| Brevard County | Florida | 531,250 | 12,438 | 2.4 |
| Broward County | Florida | 1,777,638 | 24,638 | 1.4 |
| Cameron County | Texas | 378,311 | 7,482 | 2.0 |
| Canyon County | Idaho | 164,593 | 6,710 | 4.2 |
| Cherokee County | Georgia | 184,211 | 9,360 | 5.4 |
| Chester County | Pennsylvania | 474,027 | 7,984 | 1.7 |
| Clark County | Washington | 403,766 | 11,402 | 2.9 |
| Clark County | Nevada | 1,710,551 | 62,027 | 3.8 |
| Cobb County | Georgia | 663,818 | 9,169 | 1.4 |
| Collier County | Florida | 307,242 | 10,567 | 3.6 |
| Collin County | Texas | 659,457 | 31,031 | 4.9 |
| Contra Costa County | California | 1,017,787 | 10,181 | 1.0 |
| Dallas County | Texas | 2,305,454 | 14,383 | 0.6 |
| Davis County | Utah | 268,187 | 6,792 | 2.6 |
| Delaware County | Ohio | 150,268 | 7,521 | 5.3 |
| Denton County | Texas | 554,642 | 23,660 | 4.5 |
| Deschutes County | Oregon | 141,382 | 6,764 | 5.0 |
| Douglas County | Colorado | 249,416 | 11,865 | 5.0 |
| Duval County | Florida | 826,436 | 6,813 | 0.8 |
| El Paso County | Colorado | 565,582 | 7,830 | 1.4 |
| El Paso County | Texas | 721,598 | 8,981 | 1.3 |
| Flagler County | Florida | 76,410 | 7,394 | 10.7 |
| Forsyth County | Georgia | 140,393 | 8,443 | 6.4 |
| Fort Bend County | Texas | 463,650 | 21,261 | 4.8 |
| Fresno County | California | 877,584 | 11,964 | 1.4 |
| Fulton County | Georgia | 915,623 | 9,821 | 1.1 |
| Gwinnett County | Georgia | 726,273 | 25,696 | 3.7 |
| Hamilton County | Indiana | 240,685 | 10,845 | 4.7 |
| Harris County | Texas | 3,693,050 | 51,936 | 1.4 |
| Henry County | Georgia | 167,848 | 8,909 | 5.6 |
| Hernando County | Florida | 158,409 | 7,869 | 5.2 |
| Hidalgo County | Texas | 678,275 | 20,965 | 3.2 |
| Hillsborough County | Florida | 1,132,152 | 31,819 | 2.9 |
| Horry County | South Carolina | 226,992 | 9,357 | 4.3 |
| Johnson County | Kansas | 506,562 | 9,670 | 1.9 |
| Kane County | Illinois | 482,113 | 9,352 | 2.0 |
| Kendall County | Illinois | 79,514 | 6,810 | 9.4 |
| Kern County | California | 756,825 | 22,748 | 3.1 |
| King County | Washington | 1,793,583 | 15,837 | 0.9 |
| Lake County | Illinois | 702,682 | 9,813 | 1.4 |
| Lake County | Florida | 277,035 | 15,190 | 5.8 |
| Lee County | Florida | 544,758 | 29,835 | 5.8 |
| Los Angeles County | California | 9,935,475 | 18,144 | 0.2 |
| Loudoun County | Virginia | 255,518 | 16,193 | 6.8 |
| Manatee County | Florida | 306,779 | 10,805 | 3.7 |
| Maricopa County | Arizona | 3,635,528 | 136,941 | 3.9 |
| Marion County | Florida | 303,442 | 11,674 | 4.0 |
| McHenry County | Illinois | 303,990 | 7,730 | 2.6 |
| Mecklenburg County | North Carolina | 796,372 | 24,799 | 3.2 |
| Miami-Dade County | Florida | 2,376,014 | 17,300 | 0.7 |
| Mohave County | Arizona | 187,200 | 7,637 | 4.3 |
| Montgomery County | Texas | 378,033 | 15,841 | 4.4 |
| Orange County | Florida | 1,023,023 | 33,150 | 3.3 |
| Osceola County | Florida | 231,578 | 11,451 | 5.2 |
| Palm Beach County | Florida | 1,268,548 | 24,359 | 2.0 |
| Pasco County | Florida | 429,065 | 21,019 | 5.2 |
| Pierce County | Washington | 753,787 | 8,009 | 1.1 |
| Pima County | Arizona | 924,786 | 18,246 | 2.0 |
| Pinal County | Arizona | 229,549 | 14,845 | 6.9 |
| Placer County | California | 317,028 | 10,723 | 3.5 |
| Polk County | Iowa | 401,006 | 6,975 | 1.8 |
| Polk County | Florida | 542,912 | 18,626 | 3.6 |
| Prince William County | Virginia | 348,588 | 12,063 | 3.6 |
| Riverside County | California | 1,946,419 | 76,954 | 4.1 |
| Rutherford County | Tennessee | 218,292 | 8,553 | 4.1 |
| Sacramento County | California | 1,363,482 | 12,054 | 0.9 |
| Salt Lake County | Utah | 948,172 | 13,334 | 1.4 |
| San Bernardino County | California | 1,963,535 | 47,117 | 2.5 |
| San Joaquin County | California | 664,116 | 14,875 | 2.3 |
| Santa Clara County | California | 1,699,052 | 17,072 | 1.0 |
| Sarasota County | Florida | 366,256 | 10,534 | 3.0 |
| Seminole County | Florida | 401,619 | 10,378 | 2.7 |
| Snohomish County | Washington | 655,944 | 11,739 | 1.8 |
| St. Charles County | Missouri | 329,940 | 9,481 | 3.0 |
| St. Johns County | Florida | 161,525 | 8,801 | 5.8 |
| St. Lucie County | Florida | 241,305 | 14,195 | 6.3 |
| Stanislaus County | California | 505,505 | 7,906 | 1.6 |
| Tarrant County | Texas | 1,620,479 | 33,460 | 2.1 |
| Travis County | Texas | 888,185 | 19,312 | 2.2 |
| Tulare County | California | 410,874 | 9,922 | 2.5 |
| Union County | North Carolina | 162,929 | 9,209 | 6.0 |
| Utah County | Utah | 443,738 | 9,624 | 2.2 |
| Volusia County | Florida | 490,055 | 11,104 | 2.3 |
| Wake County | North Carolina | 748,815 | 29,082 | 4.0 |
| Warren County | Ohio | 196,622 | 6,879 | 3.6 |
| Washington County | Utah | 118,885 | 8,460 | 7.7 |
| Washington County | Oregon | 499,794 | 12,246 | 2.5 |
| Washoe County | Nevada | 389,872 | 9,260 | 2.4 |
| Weld County | Colorado | 228,943 | 8,982 | 4.1 |
| Will County | Illinois | 642,813 | 25,319 | 4.1 |
| Williamson County | Texas | 333,457 | 15,308 | 4.8 |
| Yavapai County | Arizona | 198,701 | 7,964 | 4.2 |
| York County | Pennsylvania | 408,801 | 7,738 | 1.9 |