Fastest-growing counties in the US
Compare annual population growth in US counties and county equivalents.
U.S. Census Bureau Population EstimatesPeriod: July 1, 2024–July 1, 2025 · Vintage 2025Retrieved 2026-10-05T08:10:35+00:00
Percent change = (current July 1 population − previous July 1 population) / previous population × 100. Both estimates use the same Census vintage. Includes counties and county equivalents with at least 20,000 residents in the previous year. This is observed population change, not a forecast.
Ranks are competition ranks computed across the full filtered set.
| Rank | Name | State | Growth | Population |
|---|---|---|---|---|
| 1751 | Montgomery County | Kansas | -0.8% | 30,177 |
| 1752 | Monroe County | Illinois | -0.8% | 34,840 |
| 1753 | Fayette County | Pennsylvania | -0.8% | 123,021 |
| 1754 | McDonough County | Illinois | -0.8% | 25,916 |
| 1755 | Finney County | Kansas | -0.8% | 37,505 |
| 1756 | Bell County | Kentucky | -0.8% | 22,829 |
| 1757 | Union County | Pennsylvania | -0.8% | 42,313 |
| 1758 | McKean County | Pennsylvania | -0.8% | 38,984 |
| 1759 | Fayette County | Illinois | -0.8% | 20,790 |
| 1760 | Menominee County | Michigan | -0.8% | 22,941 |
| 1761 | Logan County | West Virginia | -0.8% | 30,375 |
| 1762 | Washington County | New York | -0.8% | 59,353 |
| 1763 | Marin County | California | -0.8% | 253,694 |
| 1764 | Lafayette County | Mississippi | -0.8% | 59,597 |
| 1765 | Greenbrier County | West Virginia | -0.8% | 31,578 |
| 1766 | Hale County | Texas | -0.8% | 31,819 |
| 1767 | Colusa County | California | -0.8% | 21,836 |
| 1768 | St. Louis city | Missouri | -0.8% | 278,144 |
| 1769 | Luna County | New Mexico | -0.8% | 25,407 |
| 1770 | Scotland County | North Carolina | -0.9% | 33,322 |
| 1771 | Ford County | Kansas | -0.9% | 33,993 |
| 1772 | Smyth County | Virginia | -0.9% | 28,882 |
| 1773 | Grant County | New Mexico | -0.9% | 27,252 |
| 1774 | Petersburg city | Virginia | -0.9% | 33,734 |
| 1775 | Curry County | Oregon | -0.9% | 22,621 |
| 1776 | Scott County | Virginia | -0.9% | 21,200 |
| 1777 | Huntingdon County | Pennsylvania | -0.9% | 43,001 |
| 1778 | Hancock County | West Virginia | -0.9% | 27,729 |
| 1779 | Marion County | Alabama | -0.9% | 29,097 |
| 1780 | St. Mary Parish | Louisiana | -0.9% | 46,552 |
| 1781 | Warren County | Mississippi | -0.9% | 41,759 |
| 1782 | Tazewell County | Virginia | -0.9% | 38,635 |
| 1783 | Mississippi County | Arkansas | -0.9% | 37,828 |
| 1784 | Morehouse Parish | Louisiana | -0.9% | 23,705 |
| 1785 | Randolph County | West Virginia | -0.9% | 26,882 |
| 1786 | Bolivar County | Mississippi | -0.9% | 28,262 |
| 1787 | Mendocino County | California | -0.9% | 88,122 |
| 1788 | Marion County | South Carolina | -0.9% | 28,242 |
| 1789 | Perry County | Kentucky | -0.9% | 26,555 |
| 1790 | Sunflower County | Mississippi | -0.9% | 22,893 |
| 1791 | Yazoo County | Mississippi | -0.9% | 22,947 |
| 1792 | Coahoma County | Mississippi | -1.0% | 19,849 |
| 1793 | Lincoln County | New Mexico | -1.0% | 19,844 |
| 1794 | Bennington County | Vermont | -1.0% | 36,630 |
| 1795 | Union Parish | Louisiana | -1.0% | 20,561 |
| 1796 | Boone County | West Virginia | -1.0% | 20,251 |
| 1797 | Jefferson County | Arkansas | -1.0% | 62,987 |
| 1798 | Halifax County | North Carolina | -1.0% | 46,534 |
| 1799 | Santa Cruz County | California | -1.0% | 258,852 |
| 1800 | Hardeman County | Tennessee | -1.0% | 25,274 |
1830 ranked entries.