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 |
|---|---|---|---|---|
| 251 | Dauphin County | Pennsylvania | 293,351 | 0.1% |
| 252 | Alachua County | Florida | 290,028 | 0.2% |
| 253 | Ingham County | Michigan | 289,709 | 0.8% |
| 254 | Anchorage Municipality | Alaska | 287,155 | -0.1% |
| 255 | Washington County | Minnesota | 286,895 | 1.4% |
| 256 | Southeastern Connecticut Planning Region | Connecticut | 284,015 | 0.3% |
| 257 | Winnebago County | Illinois | 283,674 | 0.3% |
| 258 | Kitsap County | Washington | 283,374 | 0.9% |
| 259 | Forsyth County | Georgia | 282,805 | 1.4% |
| 260 | San Luis Obispo County | California | 282,367 | 0.1% |
| 261 | Webb County | Texas | 281,224 | 0.2% |
| 262 | St. Tammany Parish | Louisiana | 279,108 | 0.5% |
| 263 | Atlantic County | New Jersey | 278,657 | 0.1% |
| 264 | Weber County | Utah | 278,174 | 0.7% |
| 265 | St. Louis city | Missouri | 278,144 | -0.8% |
| 266 | Buncombe County | North Carolina | 277,417 | -0.6% |
| 267 | Cumberland County | Pennsylvania | 277,270 | 1.0% |
| 268 | Sussex County | Delaware | 277,140 | 2.2% |
| 269 | Brown County | Wisconsin | 275,803 | 0.6% |
| 270 | Canyon County | Idaho | 275,123 | 2.9% |
| 271 | Berkeley County | South Carolina | 274,666 | 3.3% |
| 272 | St. Joseph County | Indiana | 272,861 | 0.0% |
| 273 | Williamson County | Tennessee | 272,061 | 1.3% |
| 274 | McLennan County | Texas | 272,020 | 0.6% |
| 275 | Washington County | Arkansas | 271,213 | 1.4% |
| 276 | Baldwin County | Alabama | 267,761 | 2.3% |
| 277 | Union County | North Carolina | 267,674 | 1.5% |
| 278 | Harford County | Maryland | 266,446 | 0.3% |
| 279 | Erie County | Pennsylvania | 265,832 | -0.2% |
| 280 | Clay County | Missouri | 265,032 | 0.9% |
| 281 | Henry County | Georgia | 264,922 | 1.9% |
| 282 | Kalamazoo County | Michigan | 263,795 | 0.3% |
| 283 | Madison County | Illinois | 263,110 | -0.1% |
| 284 | Yakima County | Washington | 259,185 | 0.1% |
| 285 | Santa Cruz County | California | 258,852 | -1.0% |
| 286 | Lafayette Parish | Louisiana | 257,949 | 1.3% |
| 287 | Warren County | Ohio | 257,181 | 0.8% |
| 288 | Johnston County | North Carolina | 256,448 | 2.8% |
| 289 | Chesapeake city | Virginia | 255,332 | 0.2% |
| 290 | Jefferson County | Texas | 254,321 | -0.1% |
| 291 | Marin County | California | 253,694 | -0.8% |
| 292 | Yavapai County | Arizona | 252,552 | 0.5% |
| 293 | Smith County | Texas | 252,549 | 1.2% |
| 294 | St. Clair County | Illinois | 250,708 | -0.3% |
| 295 | Montgomery County | Tennessee | 249,935 | 1.5% |
| 296 | Cabarrus County | North Carolina | 249,725 | 1.6% |
| 297 | Brazos County | Texas | 249,088 | 0.3% |
| 298 | Gaston County | North Carolina | 246,558 | 1.5% |
| 299 | New Hanover County | North Carolina | 245,959 | 1.1% |
| 300 | Arlington County | Virginia | 243,931 | 1.8% |
3144 ranked entries.