| Rank | County |
Metropolitan Statistical Area | Pop Change | Hsg Change | Housing Units |
| Apr 1, 2000 | Jul 1, 2007 |
| 1 | Flagler County, FL | NA | 51.36 | 98.16 | 24,452 | 48,454 |
| 2 | Sumter County, FL | NA | 18.96 | 74.61 | 25,195 | 43,992 |
| 3 | Paulding County, GA | Atlanta-Sandy Springs-Marietta, GA | 36.22 | 72.09 | 29,246 | 50,328 |
| 4 | Kendall County, IL | Chicago-Naperville-Joliet, IL-IN-WI | 44.90 | 71.07 | 19,527 | 33,404 |
| 5 | Pinal County, AZ | Phoenix-Mesa-Scottsdale, AZ | 32.06 | 69.34 | 81,146 | 137,410 |
| 6 | Teton County, ID | NA | 23.82 | 66.03 | 2,632 | 4,370 |
| 7 | Henry County, GA | Atlanta-Sandy Springs-Marietta, GA | 40.05 | 65.11 | 43,171 | 71,280 |
| 8 | Forsyth County, GA | Atlanta-Sandy Springs-Marietta, GA | 40.94 | 64.74 | 36,505 | 60,140 |
| 9 | Rockwall County, TX | Dallas-Fort Worth-Arlington, TX | 44.08 | 63.62 | 15,350 | 25,115 |
| 10 | Loudoun County, VA | Washington-Arlington-Alexandria, DC-VA-MD-WV | 49.55 | 63.33 | 62,160 | 101,527 |
| 11 | Osceola County, FL | Orlando, FL | 34.08 | 62.73 | 72,293 | 117,643 |
| 12 | Newton County, GA | Atlanta-Sandy Springs-Marietta, GA | 38.38 | 60.48 | 23,033 | 36,964 |
| 13 | Douglas County, CO | Denver-Aurora, CO | 40.21 | 56.77 | 63,333 | 99,288 |
| 14 | Fannin County, GA | NA | 9.98 | 53.62 | 11,134 | 17,104 |
| 15 | Cherokee County, GA | Atlanta-Sandy Springs-Marietta, GA | 29.02 | 51.96 | 51,937 | 78,925 |
| 16 | Washington County, UT | St. George, UT | 31.95 | 49.93 | 36,478 | 54,692 |
| 17 | Barrow County, GA | Atlanta-Sandy Springs-Marietta, GA | 28.78 | 47.64 | 17,304 | 25,547 |
| 18 | Union County, NC | Charlotte-Gastonia-Concord, NC-SC | 29.98 | 47.45 | 45,723 | 67,420 |
| 19 | Lee County, FL | Cape Coral-Fort Myers, FL | 23.04 | 46.71 | 245,405 | 360,036 |
| 20 | Culpeper County, VA | NA | 22.41 | 45.66 | 12,872 | 18,749 |
| Rank | County |
Metropolitan Statistical Area | Pop Change | Hsg Change | Housing Units |
| Apr 1, 2000 | Jul 1, 2007 |
| 21 | Jackson County, GA | NA | 25.03 | 45.27 | 16,226 | 23,572 |
| 22 | Delaware County, OH | Columbus, OH | 35.81 | 45.24 | 42,374 | 61,544 |
| 23 | Williamson County, TX | Austin-Round Rock, TX | 32.87 | 45.19 | 90,327 | 131,143 |
| 24 | DeSoto County, MS | Memphis, TN-MS-AR | 26.97 | 43.83 | 40,795 | 58,677 |
| 25 | St. Johns County, FL | Jacksonville, FL | 30.35 | 43.34 | 58,008 | 83,147 |
| 26 | Madison County, ID | NA | 26.85 | 43.26 | 7,630 | 10,931 |
| 27 | St. Lucie County, FL | Port St. Lucie-Fort Pierce, FL | 23.43 | 43.08 | 91,262 | 130,581 |
| 28 | Hamilton County, IN | Indianapolis, IN | 32.42 | 43.04 | 69,478 | 99,381 |
| 29 | Scott County, MN | Minneapolis-St. Paul-Bloomington, MN-WI | 32.55 | 43.00 | 31,609 | 45,202 |
| 30 | Collin County, TX | Dallas-Fort Worth-Arlington, TX | 33.98 | 42.01 | 194,946 | 276,852 |
| 31 | Brunswick County, NC | Wilmington, NC | 20.86 | 41.98 | 51,430 | 73,018 |
| 32 | Spencer County, KY | Louisville, KY-IN | 29.85 | 41.65 | 4,555 | 6,452 |
| 33 | Walton County, FL | NA | 22.34 | 41.59 | 29,084 | 41,180 |
| 34 | Walton County, GA | Atlanta-Sandy Springs-Marietta, GA | 24.45 | 41.37 | 22,500 | 31,809 |
| 35 | Wasatch County, UT | NA | 23.44 | 41.04 | 6,564 | 9,258 |
| 36 | Clark County, NV | Las Vegas-Paradise, NV | 24.22 | 40.83 | 559,607 | 788,094 |
| 37 | Rutherford County, TN | Nashville-Davidson--Murfreesboro, TN | 20.78 | 39.95 | 70,616 | 98,826 |
| 38 | Weld County, CO | Greeley, CO | 25.44 | 39.89 | 66,166 | 92,560 |
| 39 | Hendricks County, IN | Indianapolis, IN | 21.51 | 39.50 | 39,229 | 54,723 |
| 40 | Wright County, MN | Minneapolis-St. Paul-Bloomington, MN-WI | 21.92 | 39.49 | 34,357 | 47,924 |
| Rank | County |
Metropolitan Statistical Area | Pop Change | Hsg Change | Housing Units |
| Apr 1, 2000 | Jul 1, 2007 |
| 41 | Dallas County, IA | Des Moines, IA | 27.14 | 39.33 | 16,548 | 23,056 |
| 42 | Deschutes County, OR | Bend, OR | 22.29 | 39.27 | 54,583 | 76,018 |
| 43 | Douglas County, GA | Atlanta-Sandy Springs-Marietta, GA | 21.90 | 39.20 | 34,853 | 48,516 |
| 44 | Canyon County, ID | Boise City-Nampa, ID | 24.41 | 38.71 | 47,965 | 66,533 |
| 45 | Franklin County, WA | Kennewick-Richland-Pasco, WA | 26.97 | 38.65 | 16,084 | 22,301 |
| 46 | Sherburne County, MN | Minneapolis-St. Paul-Bloomington, MN-WI | 26.07 | 38.64 | 22,827 | 31,647 |
| 47 | Hays County, TX | Austin-Round Rock, TX | 29.64 | 38.58 | 35,636 | 49,386 |
| 48 | Coweta County, GA | Atlanta-Sandy Springs-Marietta, GA | 22.06 | 38.57 | 33,182 | 45,981 |
| 49 | Montgomery County, TX | Houston-Baytown-Sugar Land, TX | 27.39 | 38.38 | 112,770 | 156,049 |
| 50 | Horry County, SC | Myrtle Beach-Conway-North Myrtle Beach, SC | 16.23 | 37.70 | 122,103 | 168,135 |
| 51 | Dawson County, GA | Atlanta-Sandy Springs-Marietta, GA | 23.02 | 37.58 | 7,163 | 9,855 |
| 52 | Broomfield County, CO | Denver-Aurora, CO | 23.84 | 37.51 | 14,655 | 20,152 |
| 53 | Bryan County, GA | Savannah, GA | 18.81 | 37.49 | 8,675 | 11,927 |
| 54 | Gilmer County, GA | NA | 16.11 | 37.15 | 11,924 | 16,354 |
| 55 | Baldwin County, AL | NA | 15.56 | 37.03 | 74,285 | 101,791 |
| 56 | St. Croix County, WI | Minneapolis-St. Paul-Bloomington, MN-WI | 21.38 | 36.69 | 24,265 | 33,169 |
| 57 | Prince William County, VA | Washington-Arlington-Alexandria, DC-VA-MD-WV | 22.98 | 36.52 | 98,051 | 133,857 |
| 58 | Comal County, TX | San Antonio, TX | 21.46 | 36.28 | 32,718 | 44,589 |
| 59 | Kendall County, TX | San Antonio, TX | 19.75 | 35.87 | 9,610 | 13,057 |
| 60 | Lake County, FL | Orlando, FL | 30.85 | 35.78 | 102,829 | 139,621 |
| Rank | County |
Metropolitan Statistical Area | Pop Change | Hsg Change | Housing Units |
| Apr 1, 2000 | Jul 1, 2007 |
| 61 | Christian County, MO | Springfield, MO | 22.42 | 35.71 | 21,826 | 29,620 |
| 62 | Stafford County, VA | Washington-Arlington-Alexandria, DC-VA-MD-WV | 26.07 | 35.63 | 31,405 | 42,595 |
| 63 | Gwinnett County, GA | Atlanta-Sandy Springs-Marietta, GA | 22.34 | 35.29 | 209,682 | 283,669 |
| 64 | Placer County, CA | Sacramento--Arden-Arcade--Roseville, CA | 26.90 | 35.22 | 107,302 | 145,093 |
| 65 | Grand County, CO | NA | 5.58 | 34.90 | 10,894 | 14,696 |
| 66 | James City County, VA | Virginia Beach-Norfolk-Newport News, VA-NC | 19.03 | 34.84 | 20,772 | 28,010 |
| 67 | Lumpkin County, GA | NA | 18.30 | 34.49 | 8,254 | 11,101 |
| 68 | Beaufort County, SC | NA | 15.20 | 34.49 | 60,512 | 81,383 |
| 69 | Spotsylvania County, VA | Washington-Arlington-Alexandria, DC-VA-MD-WV | 27.18 | 34.18 | 33,328 | 44,719 |
| 70 | Carver County, MN | Minneapolis-St. Paul-Bloomington, MN-WI | 19.64 | 34.07 | 24,883 | 33,361 |
| 71 | Wakulla County, FL | Tallahassee, FL | 21.26 | 33.95 | 9,820 | 13,154 |
| 72 | Union County, GA | NA | 14.66 | 33.72 | 10,001 | 13,373 |
| 73 | Archuleta County, CO | NA | 17.47 | 33.63 | 6,212 | 8,301 |
| 74 | Clay County, FL | Jacksonville, FL | 19.51 | 33.47 | 53,748 | 71,735 |
| 75 | Mecklenburg County, NC | Charlotte-Gastonia-Concord, NC-SC | 15.39 | 33.35 | 292,755 | 390,393 |
| 76 | Carroll County, GA | Atlanta-Sandy Springs-Marietta, GA | 19.80 | 33.23 | 34,067 | 45,388 |
| 77 | Indian River County, FL | Vero Beach, FL | 12.27 | 33.15 | 57,902 | 77,096 |
| 78 | Effingham County, GA | Savannah, GA | 23.51 | 33.14 | 14,169 | 18,865 |
| 79 | King George County, VA | NA | 22.52 | 33.02 | 6,820 | 9,072 |
| 80 | Collier County, FL | Naples-Marco Island, FL | 22.04 | 32.87 | 144,536 | 192,043 |
| Rank | County |
Metropolitan Statistical Area | Pop Change | Hsg Change | Housing Units |
| Apr 1, 2000 | Jul 1, 2007 |
| 81 | Pike County, GA | Atlanta-Sandy Springs-Marietta, GA | 16.68 | 32.79 | 5,068 | 6,730 |
| 82 | Lee County, GA | Albany, GA | 24.68 | 32.76 | 8,813 | 11,700 |
| 83 | Utah County, UT | Provo-Orem, UT | 23.46 | 32.55 | 104,316 | 138,272 |
| 84 | New Kent County, VA | Richmond, VA | 17.76 | 32.54 | 5,203 | 6,896 |
| 85 | Boone County, KY | Cincinnati-Middletown, OH-KY-IN | 22.79 | 32.48 | 33,351 | 44,185 |
| 86 | Benton County, AR | Fayetteville-Springdale-Rogers, AR-MO | 21.97 | 32.27 | 64,228 | 84,957 |
| 87 | Towns County, GA | NA | 10.18 | 32.17 | 6,282 | 8,303 |
| 88 | Ascension Parish, LA | Baton Rouge, LA | 16.55 | 32.15 | 29,148 | 38,519 |
| 89 | Tooele County, UT | Salt Lake City, UT | 23.28 | 32.14 | 13,812 | 18,251 |
| 90 | Iron County, UT | NA | 16.59 | 32.00 | 13,618 | 17,976 |
| 91 | Wake County, NC | Raleigh-Cary, NC | 20.39 | 31.20 | 258,954 | 339,756 |
| 92 | Oconee County, GA | Athens-Clarke County, GA | 11.74 | 31.15 | 9,528 | 12,496 |
| 93 | Suffolk city, VA | Virginia Beach-Norfolk-Newport News, VA-NC | 22.42 | 30.93 | 24,704 | 32,345 |
| 94 | Will County, IL | Chicago-Naperville-Joliet, IL-IN-WI | 25.95 | 30.78 | 175,507 | 229,535 |
| 95 | Williamson County, TN | Nashville-Davidson--Murfreesboro, TN | 20.08 | 30.70 | 47,005 | 61,437 |
| 96 | Morgan County, UT | Ogden-Clearfield, UT | 8.95 | 30.49 | 2,158 | 2,816 |
| 97 | Isanti County, MN | Minneapolis-St. Paul-Bloomington, MN-WI | 19.00 | 30.37 | 12,062 | 15,725 |
| 98 | Santa Cruz County, AZ | NA | 7.21 | 30.35 | 13,036 | 16,992 |
| 99 | Berkeley County, WV | Hagerstown-Martinsburg, MD-WV | 22.01 | 30.26 | 32,913 | 42,872 |
| 100 | Scott County, KY | Lexington-Fayette, KY | 18.96 | 30.17 | 12,977 | 16,892 |
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