# List of the most populous counties by U.S. state

The following is a sortable table of the most populous county in each U.S. state, federal district, and territory. Counties and states/territories in bold have a population of at least 1 million.

## Table

| State federal district or territory | Largest county parish or municipality | Population (2013 estimate) | County parish seat or shire town | State federal district or territory population (2013 estimate) | Largest county/parish or municipality Percentage of state/federal district or territory population |
| Alabama | Jefferson | 659,479 | Birmingham | 4,833,722 | 13.64% |
| Alaska | Anchorage | 300,950 | Anchorage | 735,132 | 40.94% |
| American Samoa | Western District | 31,329 | — | 55,519 | 56.42% |
| Arizona | Maricopa | 4,009,412 | Phoenix | 6,626,624 | 60.50% |
| Arkansas | Pulaski | 391,284 | Little Rock | 2,959,373 | 13.22% |
| California | Los Angeles | 10,017,068 | Los Angeles | 38,332,521 | 26.13% |
| Colorado | El Paso | 655,044 | Colorado Springs | 5,268,367 | 12.43% |
| Connecticut | Fairfield | 939,904 | Bridgeport | 3,596,080 | 26.14% |
| Delaware | New Castle | 549,684 | Wilmington | 925,749 | 59.38% |
| District of Columbia | District of Columbia | 693,972 | District of Columbia | 693,972 | 100% |
| Florida | Miami-Dade | 2,617,176 | Miami | 19,552,860 | 13.39% |
| Georgia | Fulton | 1,010,562 | Atlanta | 10,214,860 | 9.85% |
| Guam | Guam | 162,742 | Hagåtña | 162,742 | 100% |
| Hawaii | Honolulu | 983,429 | Honolulu | 1,404,054 | 70.04% |
| Idaho | Ada | 416,464 | Boise | 1,612,136 | 25.83% |
| Illinois | Cook | 5,240,700 | Chicago | 12,882,135 | 40.68% |
| Indiana | Marion | 928,281 | Indianapolis | 6,570,902 | 14.13% |
| Iowa | Polk | 451,677 | Des Moines | 3,090,416 | 14.62% |
| Kansas | Johnson | 566,933 | Olathe | 2,893,957 | 19.59% |
| Kentucky | Jefferson | 756,832 | Louisville | 4,395,295 | 17.22% |
| Louisiana | East Baton Rouge | 445,227 | Baton Rouge | 4,625,470 | 9.63% |
| Maine | Cumberland | 285,456 | Portland | 1,328,302 | 21.49% |
| Maryland | Montgomery | 1,016,677 | Rockville | 5,928,814 | 17.15% |
| Massachusetts | Middlesex | 1,552,802 | Cambridge and Lowell | 6,692,824 | 23.20% |
| Michigan | Wayne | 1,775,273 | Detroit | 9,895,622 | 17.94% |
| Minnesota | Hennepin | 1,198,778 | Minneapolis | 5,420,380 | 22.12% |
| Mississippi | Hinds | 244,899 | Jackson | 2,991,207 | 8.19% |
| Missouri | St. Louis | 1,001,444 | Clayton | 6,044,171 | 16.57% |
| Montana | Yellowstone | 154,162 | Billings | 1,015,165 | 15.19% |
| Nebraska | Douglas | 531,265 | Omaha | 1,868,516 | 28.43% |
| Nevada | Clark | 2,027,868 | Las Vegas | 2,790,136 | 72.68% |
| New Hampshire | Hillsborough | 402,922 | Manchester and Nashua | 1,323,459 | 30.44% |
| New Jersey | Bergen | 925,328 | Hackensack | 8,899,339 | 10.40% |
| New Mexico | Bernalillo | 673,460 | Albuquerque | 2,085,287 | 32.30% |
| New York | Kings | 2,592,149 | Brooklyn | 19,651,127 | 13.19% |
| North Carolina | Wake | 990,977 | Raleigh | 9,848,060 | 10.06% |
| North Dakota | Cass | 162,829 | Fargo | 723,393 | 22.51% |
| Northern Mariana Islands | Saipan | 48,220 | Capitol Hill, Saipan | 52,263 | 92.26% |
| Ohio | Franklin | 1,268,154 | Columbus | 11,570,808 | 10.96% |
| Oklahoma | Oklahoma | 755,245 | Oklahoma City | 3,850,568 | 19.61% |
| Oregon | Multnomah | 759,256 | Portland | 3,930,065 | 19.32% |
| Pennsylvania | Philadelphia | 1,553,165 | Philadelphia | 12,773,801 | 12.16% |
| Puerto Rico | San Juan | 395,326 | San Juan | 3,337,177 | 11.84% |
| Rhode Island | Providence | 628,323 | Providence | 1,051,511 | 59.75% |
| South Carolina | Greenville | 474,266 | Greenville | 4,774,839 | 9.93% |
| South Dakota | Minnehaha | 179,640 | Sioux Falls | 844,877 | 21.26% |
| Tennessee | Shelby | 940,764 | Memphis | 6,495,978 | 14.48% |
| Texas | Harris | 4,336,853 | Houston | 26,448,193 | 16.40% |
| U.S. Minor Outlying Islands | Wake Island | (100) | (none) | (160) | 62.5% |
| Utah | Salt Lake | 1,063,842 | Salt Lake City | 2,900,872 | 36.67% |
| Vermont | Chittenden | 158,504 | Burlington | 626,630 | 25.29% |
| Virgin Islands (U.S.) | Saint Thomas island | 51,634 | — | 104,901 | 49.22% |
| Virginia | Fairfax | 1,116,897 | Fairfax | 8,260,405 | 13.52% |
| Washington | King | 2,044,449 | Seattle | 6,971,406 | 29.33% |
| West Virginia | Kanawha | 191,275 | Charleston | 1,854,304 | 10.32% |
| Wisconsin | Milwaukee | 956,023 | Milwaukee | 5,742,713 | 16.65% |
| Wyoming | Laramie | 95,809 | Cheyenne | 582,658 | 16.44% |