Largest counties by population
Rank US counties and county equivalents by resident population, not land area.
U.S. Census Bureau Population EstimatesPeriod: July 1, 2024–July 1, 2025 · Vintage 2025Retrieved 2026-10-05T08:10:35+00:00
July 1 resident population estimates from a single Census vintage. Counties are ranked by population, not land area. County equivalents include independent cities and other Census county-equivalent areas.
Ranks are competition ranks computed across the full filtered set.
| Rank | Name | State | Population | Growth |
|---|---|---|---|---|
| 1901 | Dickinson County | Kansas | 18,637 | 0.0% |
| 1902 | Deaf Smith County | Texas | 18,626 | 0.6% |
| 1903 | Roosevelt County | New Mexico | 18,615 | -0.9% |
| 1904 | Russell County | Kentucky | 18,608 | 0.3% |
| 1905 | Polk County | Tennessee | 18,592 | 1.0% |
| 1906 | Plumas County | California | 18,583 | -1.0% |
| 1907 | San Juan County | Washington | 18,577 | 0.1% |
| 1908 | Benzie County | Michigan | 18,568 | 0.4% |
| 1909 | Buchanan County | Virginia | 18,492 | -1.2% |
| 1910 | Madison County | Arkansas | 18,410 | 1.9% |
| 1911 | Houston County | Minnesota | 18,400 | -0.7% |
| 1912 | Henry County | Alabama | 18,394 | 0.9% |
| 1913 | Bethel Census Area | Alaska | 18,391 | 0.1% |
| 1914 | Poweshiek County | Iowa | 18,368 | -0.3% |
| 1915 | Cedar County | Iowa | 18,359 | 0.4% |
| 1916 | Park County | Colorado | 18,314 | -0.2% |
| 1917 | Marengo County | Alabama | 18,311 | -0.9% |
| 1918 | Jefferson County | Kansas | 18,296 | -0.1% |
| 1919 | Andrew County | Missouri | 18,241 | 0.7% |
| 1920 | Clay County | Mississippi | 18,238 | 0.0% |
| 1921 | Cook County | Georgia | 18,232 | 1.3% |
| 1922 | Pickens County | Alabama | 18,221 | -1.3% |
| 1923 | Park County | Montana | 18,214 | 0.2% |
| 1924 | Garrard County | Kentucky | 18,207 | 1.4% |
| 1925 | Hampton County | South Carolina | 18,174 | -0.1% |
| 1926 | Inyo County | California | 18,158 | -0.8% |
| 1927 | Young County | Texas | 18,154 | -0.9% |
| 1928 | Eastland County | Texas | 18,143 | -0.9% |
| 1929 | Macon County | Alabama | 18,132 | -0.8% |
| 1930 | Sharp County | Arkansas | 18,122 | 0.1% |
| 1931 | Avery County | North Carolina | 18,110 | 0.0% |
| 1931 | Southampton County | Virginia | 18,110 | 0.5% |
| 1933 | Butler County | Alabama | 18,100 | -1.0% |
| 1934 | Dickinson County | Iowa | 18,077 | 0.0% |
| 1935 | Dixie County | Florida | 18,038 | 0.9% |
| 1936 | Seward County | Nebraska | 18,032 | 0.8% |
| 1937 | Morgan County | West Virginia | 18,027 | 1.2% |
| 1938 | Dallas County | Missouri | 18,025 | 0.9% |
| 1939 | Chester County | Tennessee | 17,994 | 0.9% |
| 1940 | Pike County | Missouri | 17,955 | -0.4% |
| 1941 | Covington County | Mississippi | 17,898 | -0.8% |
| 1942 | Idaho County | Idaho | 17,874 | 0.0% |
| 1943 | Falls County | Texas | 17,869 | 0.6% |
| 1944 | Montour County | Pennsylvania | 17,868 | -0.2% |
| 1945 | Sequatchie County | Tennessee | 17,861 | 1.4% |
| 1946 | Unicoi County | Tennessee | 17,856 | -0.4% |
| 1947 | Robertson County | Texas | 17,839 | 1.2% |
| 1948 | Concordia Parish | Louisiana | 17,836 | -1.4% |
| 1949 | Ashley County | Arkansas | 17,831 | -1.1% |
| 1950 | Rabun County | Georgia | 17,764 | 0.5% |
3144 ranked entries.