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 |
|---|---|---|---|---|
| 151 | Seminole County | Florida | 491,884 | 0.5% |
| 152 | Sonoma County | California | 486,444 | 0.2% |
| 153 | Tulare County | California | 485,146 | 0.3% |
| 154 | Osceola County | Florida | 481,718 | 3.4% |
| 155 | Burlington County | New Jersey | 481,439 | 0.8% |
| 156 | Sarasota County | Florida | 479,958 | 0.8% |
| 157 | York County | Pennsylvania | 473,197 | 0.7% |
| 158 | Manatee County | Florida | 468,200 | 2.0% |
| 159 | Onondaga County | New York | 466,584 | -0.3% |
| 160 | Hampden County | Massachusetts | 464,338 | 0.2% |
| 161 | Naugatuck Valley Planning Region | Connecticut | 463,349 | 0.4% |
| 162 | Dakota County | Minnesota | 457,710 | 0.9% |
| 163 | East Baton Rouge Parish | Louisiana | 456,180 | 0.4% |
| 164 | Lake County | Florida | 456,068 | 2.8% |
| 165 | Solano County | California | 455,376 | 0.1% |
| 166 | Virginia Beach city | Virginia | 453,737 | 0.0% |
| 167 | Loudoun County | Virginia | 449,749 | 1.4% |
| 168 | Marion County | Florida | 442,660 | 3.4% |
| 169 | Placer County | California | 442,081 | 1.8% |
| 170 | Santa Barbara County | California | 442,065 | -0.2% |
| 171 | Berks County | Pennsylvania | 440,072 | 0.4% |
| 172 | Charleston County | South Carolina | 436,200 | 0.7% |
| 173 | Richland County | South Carolina | 434,956 | 1.0% |
| 174 | Cameron County | Texas | 433,946 | 0.2% |
| 175 | Monterey County | California | 433,729 | 0.1% |
| 176 | Madison County | Alabama | 433,516 | 2.5% |
| 177 | Hillsborough County | New Hampshire | 433,415 | 0.7% |
| 178 | Jefferson Parish | Louisiana | 431,398 | -0.2% |
| 179 | Horry County | South Carolina | 427,551 | 3.2% |
| 180 | St. Charles County | Missouri | 426,499 | 0.9% |
| 181 | Clackamas County | Oregon | 426,280 | 0.2% |
| 182 | Lucas County | Ohio | 423,347 | -0.2% |
| 183 | Brazoria County | Texas | 419,080 | 1.9% |
| 184 | Orange County | New York | 417,669 | 0.6% |
| 185 | Waukesha County | Wisconsin | 417,210 | 0.3% |
| 186 | Collier County | Florida | 417,131 | 0.1% |
| 187 | Mobile County | Alabama | 411,658 | -0.1% |
| 188 | Pulaski County | Arkansas | 404,611 | 0.3% |
| 189 | St. Lucie County | Florida | 402,449 | 2.8% |
| 190 | Allen County | Indiana | 402,329 | 0.8% |
| 191 | Bell County | Texas | 402,248 | 1.2% |
| 192 | Forsyth County | North Carolina | 401,718 | 1.0% |
| 193 | Genesee County | Michigan | 401,093 | 0.0% |
| 194 | Butler County | Ohio | 400,128 | 0.6% |
| 195 | Douglas County | Colorado | 399,396 | 1.6% |
| 196 | Mercer County | New Jersey | 399,289 | 0.5% |
| 197 | Chesterfield County | Virginia | 397,148 | 1.5% |
| 198 | Hamilton County | Tennessee | 390,833 | 0.9% |
| 199 | Hamilton County | Indiana | 387,036 | 1.9% |
| 200 | Rutherford County | Tennessee | 386,352 | 1.6% |
3144 ranked entries.