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

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