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 and territory. Counties in bold have a population of at least 1 million.
Table
| State |
Largest county/parish/municipality |
Population (2013 estimate) |
County/parish seat or shire town |
| Alabama | Jefferson | 659,479 | Birmingham |
| Alaska | Anchorage | 300,950 | Anchorage |
| Arizona | Maricopa | 4,009,412 | Phoenix |
| Arkansas | Pulaski | 391,284 | Little Rock |
| California | Los Angeles | 10,017,068 | Los Angeles |
| Colorado | El Paso | 655,044 | Colorado Springs |
| Connecticut | Fairfield | 939,904 | Bridgeport |
| Delaware | New Castle | 549,684 | Wilmington |
| Florida | Miami-Dade | 2,617,176 | Miami |
| Georgia | Fulton | 984,293 | Atlanta |
| Hawaii | Honolulu | 983,429 | Honolulu |
| Idaho | Ada | 416,464 | Boise |
| Illinois | Cook | 5,240,700 | Chicago |
| Indiana | Marion | 928,281 | Indianapolis |
| Iowa | Polk | 451,677 | Des Moines |
| Kansas | Johnson | 566,933 | Olathe |
| Kentucky | Jefferson | 756,832 | Louisville |
| Louisiana | East Baton Rouge | 445,227 | Baton Rouge |
| Maine | Cumberland | 285,456 | Portland |
| Maryland | Montgomery | 1,016,677 | Rockville |
| Massachusetts | Middlesex | 1,552,802 | Cambridge and Lowell |
| Michigan | Wayne | 1,775,273 | Detroit |
| Minnesota | Hennepin | 1,198,778 | Minneapolis |
| Mississippi | Hinds | 244,899 | Jackson |
| Missouri | St. Louis County | 1,001,444 | Clayton |
| Montana | Yellowstone | 154,162 | Billings |
| Nebraska | Douglas | 531,265 | Omaha |
| Nevada | Clark | 2,027,868 | Las Vegas |
| New Hampshire | Hillsborough | 402,922 | Manchester and Nashua |
| New Jersey | Bergen | 925,328 | Hackensack |
| New Mexico | Bernalillo | 673,460 | Albuquerque |
| New York | Kings | 2,592,149 | Brooklyn |
| North Carolina | Mecklenburg | 990,977 | Charlotte |
| North Dakota | Cass | 162,829 | Fargo |
| Ohio | Cuyahoga | 1,268,154 | Cleveland |
| Oklahoma | Oklahoma | 755,245 | Oklahoma City |
| Oregon | Multnomah | 759,256 | Portland |
| Pennsylvania | Philadelphia | 1,553,165 | Philadelphia |
| Rhode Island | Providence | 628,323 | Providence |
| South Carolina | Greenville | 474,266 | Greenville |
| South Dakota | Minnehaha | 179,640 | Sioux Falls |
| Tennessee | Shelby | 940,764 | Memphis |
| Texas | Harris | 4,336,853 | Houston |
| Utah | Salt Lake | 1,063,842 | Salt Lake City |
| Vermont | Chittenden | 158,504 | Burlington |
| Virginia | Fairfax | 1,116,897 | Fairfax |
| Washington | King | 2,044,449 | Seattle |
| West Virginia | Kanawha | 191,275 | Charleston |
| Wisconsin | Milwaukee | 956,023 | Milwaukee |
| Wyoming | Laramie | 95,809 | Cheyenne |
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