In 45 of the 50 states of theUnited States, thecounty is used for the level of local government immediately below the state itself.Louisiana usesparishes, andAlaska usesboroughs. InConnecticut,Massachusetts, andRhode Island, some or all counties within states have no governments of their own; the counties continue to exist as legal entities, however, and are used by states for some administrative functions and by the United States Census bureau for statistical analysis. There are 3,242counties andcounty equivalent administrative units in total, including theDistrict of Columbia and 100 county-equivalents in theU.S. territories.
There are 41independent cities in the United States. InVirginia, any municipality that is incorporated as a city legally becomes independent of any county. Where indicated, the statistics below do not include Virginia's 38 independent cities.
InAlaska, most of the land area of the state has no county-level government. Those parts of the state are divided by theUnited States Census Bureau intocensus areas, which are not the same as boroughs. The state's largest statistical division by area is theYukon–Koyukuk Census Area, which is larger than any of the state's boroughs. AlthoughAnchorage is called a municipality, it is considered a consolidated city and borough.
There are 100 county-equivalents in theterritories of the United States: they are the3 districts and 2 atolls ofAmerican Samoa, all ofGuam (Guam as one single county-equivalent), the 4 municipalities in theNorthern Mariana Islands, the78 municipalities ofPuerto Rico, the 3 main islands of theU.S. Virgin Islands, and the 9 islands in theU.S. Minor Outlying Islands.[1][2][3] All of these territorial county-equivalents are defined by the U.S. Census Bureau.
This is the number of counties and county-equivalents for each state, theDistrict of Columbia, the 5 inhabitedterritories of the United States, and theU.S. Minor Outlying Islands.
Lists of counties and county equivalents by number per political division:
| Count | State, federal district or territory | Notes |
|---|---|---|
| 254 |  Texas | The most counties of any U.S. state |
| 159 |  Georgia | |
| 133 |  Virginia | 95 counties and38independent cities |
| 120 |  Kentucky | |
| 115 |  Missouri | 114 counties and1independent city |
| 105 |  Kansas | |
| 102 |  Illinois | |
| 100 |  North Carolina | |
| 99 |  Iowa | |
| 95 |  Tennessee | |
| 93 |  Nebraska | |
| 92 |  Indiana | |
| 88 |  Ohio | |
| 87 |  Minnesota | |
| 83 |  Michigan | |
| 82 |  Mississippi | |
| 78 |  Puerto Rico | Puerto Rico has no counties. The 78municipalities of Puerto Rico are counted as county-equivalents by theU.S. Census Bureau |
| 77 |  Oklahoma | |
| 75 |  Arkansas | |
| 72 |  Wisconsin | |
| 67 |  Alabama | |
| 67 |  Florida | |
| 67 |  Pennsylvania | |
| 66 |  South Dakota | |
| 64 |  Colorado | |
| 64 |  Louisiana | Louisiana has no counties. The64 parishes of Louisiana are counted as county-equivalents by theU.S. Census Bureau |
| 62 |  New York | New York City is asui generis jurisdiction, in which the city government consists of5 boroughs each coterminous with a county of the State of New York |
| 58 |  California | |
| 56 |  Montana | |
| 55 |  West Virginia | |
| 53 |  North Dakota | |
| 46 |  South Carolina | |
| 44 |  Idaho | |
| 39 |  Washington | |
| 36 |  Oregon | |
| 33 |  New Mexico | |
| 30 |  Alaska | Alaska has no counties. The following areas in Alaska are counted as county-equivalents: the19 organizedboroughs and, in itsUnorganized Borough,11 designatedcensus areas |
| 29 |  Utah | |
| 24 |  Maryland | 23 counties and1independent city |
| 23 |  Wyoming | |
| 21 |  New Jersey | |
| 17 |  Nevada | 16 counties and1independent city |
| 16 |  Maine | |
| 15 |  Arizona | |
| 14 |  Massachusetts | 8 of the 14 counties in Massachusetts were disincorporated in the 1990s and early 2000s; local government in these areas consists of cities and towns.One of the remaining 6 counties is a consolidated town-county |
| 14 |  Vermont | |
| 10 |  New Hampshire | |
| 9 |  U.S. Minor Outlying Islands | The U.S. Minor Outlying Islands does not have counties. The 9 islands in the U.S. Minor Outlying Islands are counted as county-equivalents by theU.S. Census Bureau |
| 9 |  Connecticut | The U.S. Census Bureau uses Connecticut's nine planning regions instead of its eight historic counties for statistical purposes. |
| 5 |  American Samoa | The3 districts and 2 unorganized atolls of American Samoa are counted as county-equivalents by the U.S. Census Bureau. American Samoa locally has 14 "counties", but these "counties" are not counted as counties by theU.S. Census Bureau (they are treated as "minor civil divisions")[2] |
| 5 |  Hawaii | |
| 5 |  Rhode Island | Counties in Rhode Island have no governmental functions; local government is provided byeight cities andthirty-one towns |
| 4 |  Northern Mariana Islands | The Northern Mariana Islands has no counties. The 4 municipalities of the Northern Mariana Islands are counted as county-equivalents by theU.S. Census Bureau |
| 3 |  Delaware | The fewest counties of any U.S. state |
| 3 |  Virgin Islands (U.S.) | The U.S. Virgin Islands has no counties. The 3 main islands of the U.S. Virgin Islands are counted as county-equivalents by theU.S. Census Bureau |
| 1 |  District of Columbia | The District of Columbia has no counties; the District of Columbia is considered both a state-equivalent and a county equivalent for statistical purposes[4] |
| 1 |  Guam | Guam has no counties; Guam is considered both a state-equivalent and a county-equivalent for statistical purposes by theU.S. Census Bureau (similar to theDistrict of Columbia)[2] |
These rankings include county equivalents.
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The following is a list of the least populous counties and county-equivalents in all U.S. territory. Note that the only entity on this list with a permanent human population isSwains Island, American Samoa. The first 8 counties (county-equivalents) are uninhabited, while the 10th on the list (Palmyra Atoll) has a small non-permanent human population whose maximum capacity is 20 people.[6]
| Rank | County | Population |
|---|---|---|
| 1 | Baker Island, U.S. Minor Outlying Islands | 0 |
| 2 | Howland Island, U.S. Minor Outlying Islands | 0 |
| 3 | Jarvis Island, U.S. Minor Outlying Islands | 0 |
| 4 | Johnston Atoll, U.S. Minor Outlying Islands | 0 |
| 5 | Kingman Reef, U.S. Minor Outlying Islands | 0 |
| 6 | Navassa Island, U.S. Minor Outlying Islands | 0 |
| 7 | Northern Islands Municipality, Northern Mariana Islands | 0 |
| 8 | Rose Atoll, American Samoa | 0 |
| 9 | Swains Island, American Samoa | 0 |
| 10 | Palmyra Atoll, U.S. Minor Outlying Islands | 20[note 3] |
![Palmyra Atoll — the least-populous inhabited[note 4] county or county-equivalent in the United States](/mt/?noimg=&dark=on&url=https%3a%2f%2fen.wikipedia.org%2fwiki%2fFile%3aStrawn_Island_at_Palmyra_Atoll_NWR_(5123999194).jpg)
The largest counties and county-equivalents are organized boroughs and the census areas of Alaska with the top two beingYukon–Koyukuk Census Area (145,504.79 sq mi or 376,855.7 km2) andNorth Slope Borough (88,695.41 sq mi or 229,720.1 km2). The smallest counties and county equivalents (in the 50 states) are the independent cities of Virginia with the extreme beingFalls Church at 2.05 sq mi (5.3 km2; 1,310 acres).[8] If theU.S. territories are included, the smallest county-equivalent isKingman Reef, with a land area of 0.012 square miles (3.1 ha; 7.7 acres).[9]
The following two tablesexclude county-equivalents:
| Rank | County | Land area (sq mi) | Land area (km2) |
|---|---|---|---|
| 1 | San Bernardino County, California | 20,056.94 | 51,947.24 |
| 2 | Coconino County, Arizona | 18,618.89 | 48,222.70 |
| 3 | Nye County, Nevada | 18,181.92 | 47,090.96 |
| 4 | Elko County, Nevada | 17,169.83 | 44,469.66 |
| 5 | Mohave County, Arizona | 13,311.08 | 34,475.54 |
| 6 | Apache County, Arizona | 11,197.52 | 29,001.44 |
| 7 | Lincoln County, Nevada | 10,633.20 | 27,539.86 |
| 8 | Sweetwater County, Wyoming | 10,426.65 | 27,004.90 |
| 9 | Inyo County, California | 10,180.88 | 26,368.36 |
| 10 | Harney County, Oregon | 10,133.17 | 26,244.79 |
| Rank | County | Land area (sq mi) | Land area (km2) |
|---|---|---|---|
| 1 | Kalawao County, Hawaii | 11.99 | 31.05 |
| 2 | New York County, New York | 22.83 | 59.13 |
| 3 | Bristol County, Rhode Island | 24.16 | 62.57 |
| 4 | Arlington County, Virginia | 25.97 | 67.26 |
| 5 | Broomfield County, Colorado | 33.03 | 85.55 |
| 6 | Bronx County, New York | 42.10 | 109.04 |
| 7 | Nantucket County, Massachusetts | 44.97 | 116.47 |
| 8 | Hudson County, New Jersey | 46.19 | 119.63 |
| 9 | San Francisco County, California | 46.87 | 121.39 |
| 10 | Suffolk County, Massachusetts | 58.15 | 150.61 |
The following two tablesinclude county-equivalents:[note 9]
| Rank | County | Land area (sq mi) | Land area (km2) |
|---|---|---|---|
| 1 | Yukon-Koyukuk Census Area, Alaska | 145,899.69 | 377,868.5 |
| 2 | North Slope Borough, Alaska | 88.817.12 | 230,035.3 |
| 3 | Bethel Census Area, Alaska | 40.633.31 | 105,239.8 |
| 4 | Northwest Arctic Borough, Alaska | 35,898.34 | 92,976.3 |
| 5 | Southeast Fairbanks Census Area, Alaska | 24,814.86 | 64,270.2 |
| 6 | Copper River Census Area, Alaska | 24,692.00 | 63,951.98 |
| 7 | Matanuska-Susitna Borough, Alaska | 24,681.54 | 63,924.9 |
| 8 | Lake and Peninsula Borough, Alaska | 23,781.96 | 61,595.0 |
| 9 | Nome Census Area, Alaska | 23,000.91 | 59,572 |
| 10 | San Bernardino County, California | 20,052.5 | 51,936 |
| Rank | County | Land area (sq mi) | Land area (km2) |
|---|---|---|---|
| 1 | Kingman Reef, U.S. Minor Outlying Islands | 0.01 | 0.03 |
| 2 | Rose Atoll, American Samoa | 0.1 | 0.3 |
| 3 | Baker Island, U.S. Minor Outlying Islands | 0.5 | 1.4 |
| 4 | Howland Island, U.S. Minor Outlying Islands | 0.6 | 1.6 |
| 5 | Swains Island, American Samoa | 1 | 2.6 |
| 6 | Johnston Atoll, U.S. Minor Outlying Islands | 1.1 | 2.8 |
| 7 | Jarvis Island, U.S. Minor Outlying Islands | 1.7 | 4.5 |
| 8 | Navassa Island, U.S. Minor Outlying Islands | 2.08 | 5.4 |
| 9 | IndependentCity of Falls Church, Virginia | 2.1 | 5.44 |
| 10 | Midway Atoll, U.S. Minor Outlying Islands | 2.4 | 6.2 |
| Rank | County | Land area (sq mi) | Land area (km2) |
|---|---|---|---|
| 1 | IndependentCity of Falls Church, Virginia | 2.1 | 5.4 |
| 2 | IndependentCity of Lexington, Virginia | 2.5 | 6.5 |
| 3 | IndependentCity of Manassas Park, Virginia | 2.5 | 6.5 |
| 4 | IndependentCity of Covington, Virginia | 4 | 10 |
| 5 | IndependentCity of Fairfax, Virginia | 6 | 16 |
| 6 | IndependentCity of Buena Vista, Virginia | 7 | 18 |
| 7 | IndependentCity of Emporia, Virginia | 7 | 18 |
| 8 | IndependentCity of Norton, Virginia | 7 | 18 |
| 9 | IndependentCity of Colonial Heights, Virginia | 8 | 21 |
| 10 | IndependentCity of Franklin, Virginia | 8 | 21 |
| 11 | IndependentCity of Galax, Virginia | 8 | 21 |
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The following is a list of civil right appeal of jury appeal of judge counties and county-equivalents showing the average size of each state/territory's counties, the smallest county (or equivalent) in each state/territory, and the largest county (or equivalent) in each state/territory. States/territories on the list are arranged by the average land area of their counties. Though not on the list, the North Slope Borough is the largest independently incorporated county equivalent. The Unorganized Borough is substantially larger, but is an extension of the State of Alaska government and not independently incorporated.[A]
Also note that the smallest land area with county-level governance in the U.S. isFalls Church, Virginia, but it is anindependent city and not a county or part of one.Kingman Reef is the smallest county-equivalent in all U.S. territory (though it has no government).Kalawao County, Hawaii is the smallest true county by land area.
| State federal district or territory | Avg. county land area, sq. mi. (km2) | Smallest county | Area, sq. mi. (km2) | Largest county | area, sq. mi. (km2) |
|---|---|---|---|---|---|
| The 50 states & D.C. | 1,124.09 (2,911.4)[note 10] | IndependentCity of Falls Church, Virginia | 2.0 (5.2) | Yukon-Koyukuk Census Area, Alaska[note 11] | 145,505 (376,860) |
| The 50 states, D.C. & U.S. territories | 1,090.69 (2,824.9)[note 12] | Kingman Reef, U.S. Minor Outlying Islands | 0.01 (0.026) | Yukon-Koyukuk Census Area, Alaska | 145,505 (376,860) |
| Alaska | 8,545.7 (22,133) | Skagway Municipality | 452.3 (1,171) | Yukon-Koyukuk Census Area | 145,505 (376,860) |
| Arizona | 7,572.9 (19,614) | Santa Cruz County | 1,236.9 (3,204) | Coconino County | 18,618.8 (48,222) |
| Nevada | 6,457.7 (16,725) | City of Carson City | 144.6 (375) | Nye County | 18,181.9 (47,091) |
| Wyoming | 4,221.4 (10,933) | Hot Springs County | 2,004.0 (5,190) | Sweetwater County | 10,426.6 (27,005) |
| New Mexico | 3,675.7 (9,520) | Los Alamos County | 109.1 (283) | Catron County | 6,923.6 (17,932) |
| Utah | 2,833.4 (7,338) | Davis County | 298.7 (774) | San Juan County | 7,819.9 (20,253) |
| California | 2,685.8 (6,956) | San Francisco County | 46.8 (121) | San Bernardino County | 20,056.9 (51,947) |
| Oregon | 2,666.3 (6,906) | Multnomah County | 431.3 (1,117) | Harney County | 10,133.1 (26,245) |
| Montana | 2,599.0 (6,731) | Silver Bow County | 718.4 (1,861) | Beaverhead County | 5,541.6 (14,353) |
| Maine | 1,927.7 (4,993) | Sagadahoc County | 253.6 (657) | Aroostook County | 6,671.3 (17,279) |
| Idaho | 1,878.3 (4,865) | Payette County | 406.8 (1,054) | Idaho County | 8,477.3 (21,956) |
| Washington | 1,704.0 (4,413) | San Juan County | 173.9 (450) | Okanogan County | 5,267.9 (13,644) |
| Colorado | 1,619.4 (4,194) | Broomfield County | 33.0 (85) | Las Animas County | 4,772.6 (12,361) |
| North Dakota | 1,301.9 (3,372) | Eddy County | 630.1 (1,632) | McKenzie County | 2,760.3 (7,149) |
| Hawaii | 1,284.5 (3,327) | Kalawao County | 11.9 (31) | Hawaii County | 4,028.4 (10,434) |
| South Dakota | 1,148.7 (2,975) | Clay County | 412.1 (1,067) | Meade County | 3,470.9 (8,990) |
| Texas | 1,028.5 (2,664) | Rockwall County | 127.0 (329) | Brewster County | 6,183.7 (16,016) |
| Minnesota | 915.2 (2,370) | Ramsey County | 152.2 (394) | St. Louis County | 6,247.4 (16,181) |
| New Hampshire | 895.3 (2,319) | Strafford County | 368.9 (955) | Coos County | 1,794.6 (4,648) |
| Oklahoma | 890.8 (2,307) | Marshall County | 371.0 (961) | Osage County | 2,246.3 (5,818) |
| Nebraska | 826.1 (2,140) | Sarpy County | 238.9 (619) | Cherry County | 5,960.4 (15,437) |
| Florida | 800.4 (2,073) | Union County | 243.5 (631) | Collier County | 1,998.3 (5,176) |
| Kansas | 778.7 (2,017) | Wyandotte County | 151.6 (393) | Butler County | 1,429.8 (3,703) |
| Alabama | 767.4 (1,988) | Etowah County | 534.9 (1,385) | Baldwin County | 1,589.7 (4,117) |
| New York | 760.1 (1,969) | New York County | 22.8 (59) | St. Lawrence County | 2,680.3 (6,942) |
| Wisconsin | 752.2 (1,948) | Pepin County | 231.9 (601) | Marathon County | 1,544.9 (4,001) |
| Arkansas | 693.8 (1,797) | Lafayette County | 528.2 (1,368) | Union County | 1,039.2 (2,692) |
| Michigan | 681.2 (1,764) | Benzie County | 319.7 (828) | Marquette County | 1,808.4 (4,684) |
| Louisiana | 675.1 (1,749) | Orleans Parish | 169.4 (439) | Vernon Parish | 1,327.9 (3,439) |
| Pennsylvania | 667.8 (1,730) | Montour County | 130.2 (337) | Lycoming County | 1,228.5 (3,182) |
| Vermont | 658.3 (1,705) | Grand Isle County | 81.8 (212) | Windsor County | 969.3 (2,510) |
| South Carolina | 653.5 (1,693) | McCormick County | 359.1 (930) | Horry County | 1,133.9 (2,937) |
| Delaware | 649.5 (1,682) | New Castle County | 426.2 (1,104) | Sussex County | 936.0 (2,424) |
| Connecticut | 605.3 (1,568) | Middlesex County | 369.3 (956) | Litchfield County | 920.5 (2,384) |
| Missouri | 597.8 (1,548) | City of St. Louis | 61.9 (160) | Texas County | 1,177.2 (3,049) |
| Mississippi | 572.2 (1,482) | Alcorn County | 400.0 (1,036) | Yazoo County | 922.9 (2,390) |
| Iowa | 564.2 (1,461) | Dickinson County | 380.6 (986) | Kossuth County | 972.7 (2,519) |
| Massachusetts | 557.1 (1,443) | Nantucket County | 44.9 (116) | Worcester County | 1,510.7 (3,913) |
| Illinois | 544.3 (1,410) | Putnam County | 160.1 (415) | McLean County | 1,183.3 (3,065) |
| North Carolina | 486.2 (1,259) | Chowan County | 172.4 (447) | Robeson County | 949.2 (2,458) |
| Ohio | 464.3 (1,203) | Lake County | 227.4 (589) | Ashtabula County | 701.9 (1,818) |
| West Virginia | 437.1 (1,132) | Hancock County | 82.6 (214) | Randolph County | 1,039.6 (2,693) |
| Tennessee | 434.1 (1,124) | Trousdale County | 114.1 (296) | Shelby County | 763.1 (1,976) |
| Maryland | 404.5 (1,048) | City of Baltimore | 80.9 (210) | Frederick County | 660.2 (1,710) |
| Indiana | 389.4 (1,009) | Ohio County | 86.1 (223) | Allen County | 657.3 (1,702) |
| Georgia | 361.7 (937) | Clarke County | 119.2 (309) | Ware County | 892.4 (2,311) |
| New Jersey | 350.2 (907) | Hudson County | 46.1 (119) | Burlington County | 798.5 (2,068) |
| Kentucky | 329.1 (852) | Robertson County | 99.9 (259) | Pike County | 786.8 (2,038) |
| Virginia | 294.7 (763) | IndependentCity of Falls Church | 2.0 (5.2) | Pittsylvania County | 968.9 (2,509) |
| Guam | 210 (540) | Guam | 210 (540) | Guam | 210 (540) |
| Rhode Island | 206.8 (536) | Bristol County | 24.1 (62) | Providence County | 409.5 (1,061) |
| District of Columbia | 61.05 (158.1) | District of Columbia | 61.05 (158.1) | District of Columbia | 61.05 (158.1) |
| Puerto Rico | 45.06 (116.7) | Cataño Municipality | 4.84 (12.5) | Arecibo Municipality | 125.95 (326.2) |
| Northern Mariana Islands | 44.75 (115.9) | Rota Municipality | 32.97 (85.4) | Northern Islands Municipality | 59.75 (154.8) |
| U.S. Virgin Islands | 44.57 (115.4) | Saint John | 20 (52) | Saint Croix | 84 (220) |
| American Samoa | 15.4 (40) | Rose Atoll | 0.083 (0.21) | Western District | 28.87 (74.8) |
| U.S. Minor Outlying Islands | 1.46 (3.8) | Kingman Reef | 0.01 (0.026) | Palmyra Atoll | 4.59 (11.9) |
Data presented below is based on U.S. Census department data from 2010.[10] Calculations are made by dividing the population by the land area. All county equivalents are included. This list includes the 50 most densely populated counties and county-equivalents in the 50 states and District of Columbia, plus the 9 highest-densitymunicipalities (county-equivalents) ofPuerto Rico. Puerto Rico is the onlyU.S. territory with population densities (of county-equivalents) high enough to be on this list.[11] Note that many of these high-density counties are coterminous with large cities (for example San Francisco and Philadelphia) or areindependent cities in Virginia (as well asBaltimore andSt. Louis) which are considered county-equivalents.
This list was generated by dividing the population by the land area. All county equivalents are included. The list is dominated by just a few states: Alaska, Montana, and Texas together comprise about two-thirds of the entries. TheUnorganized Borough is not included here as a unit, but itscensus areas (non-governmental entities) are. If the census areas were removed from the list, the Unorganized Borough would rank fourteenth with a density of 0.38 per square mile (0.15/km2).
The 8 uninhabited county-equivalents in the U.S. territories are listed at the top of the table — these are technically the least-densely populated counties/county-equivalents in the United States, but since they have no people, they are listed unranked.
Data presented below is based on U.S. Census Bureau data from 2010.[10] Calculations are made by dividing the population by the land area. All county equivalents are included.
Excluding the census areas of Alaska,Lake and Peninsula Borough is the least densely populated county equivalent with 0.069/sq mi (0.027/km2).
TheDistrict of Columbia andGuam each only have one county-equivalent, so their most/least densely populated county is the same.
| State federal district or territory | Least densely populated county | Population density | Most densely populated county | Population density |
|---|---|---|---|---|
| Alabama | Wilcox County | 13.13/sq mi (5.07/km2) | Jefferson County | 592.53/sq mi (228.78/km2) |
| Alaska | Yukon-Koyukuk Census Area | 0.03/sq mi (0.012/km2) | Anchorage Municipality | 171.19/sq mi (66.10/km2) |
| American Samoa | Rose Atoll[note 13] | 0.00/sq mi (0/km2) | Western District | 1,139.00/sq mi (439.77/km2) |
| Arizona | La Paz County | 4.55/sq mi (1.76/km2) | Maricopa County | 414.89/sq mi (160.19/km2) |
| Arkansas | Calhoun County | 8.53/sq mi (3.29/km2) | Pulaski County | 503.77/sq mi (194.51/km2) |
| California | Alpine County | 1.59/sq mi (0.61/km2) | San Francisco County | 17,179.15/sq mi (6,632.91/km2) |
| Colorado | Hinsdale County | 0.75/sq mi (0.29/km2) | Denver County | 3,922.59/sq mi (1,514.52/km2) |
| Connecticut | Litchfield County | 206.31/sq mi (79.66/km2) | Fairfield County | 1,467.18/sq mi (566.48/km2) |
| Delaware | Sussex County | 210.60/sq mi (81.31/km2) | New Castle County | 1,263.18/sq mi (487.72/km2) |
| District of Columbia | District of Columbia | 9,857.20/sq mi (3,805.89/km2) | District of Columbia | 9,857.20/sq mi (3,805.89/km2) |
| Florida | Liberty County | 10.01/sq mi (3.86/km2) | Pinellas County | 3,347.50/sq mi (1,292.48/km2) |
| Georgia | Clinch County | 8.49/sq mi (3.28/km2) | DeKalb County | 2,585.72/sq mi (998.35/km2) |
| Guam | Guam | 759.60/sq mi (293.28/km2) | Guam | 759.60/sq mi (293.28/km2) |
| Hawaii | Kalawao County | 7.50/sq mi (2.90/km2) | Honolulu County | 1,586.71/sq mi (612.63/km2) |
| Idaho | Clark County | 0.55/sq mi (0.21/km2) | Ada County | 372.76/sq mi (143.92/km2) |
| Illinois | Pope County | 12.12/sq mi (4.68/km2) | Cook County | 5,495.11/sq mi (2,121.67/km2) |
| Indiana | Benton County | 21.78/sq mi (8.41/km2) | Marion County | 2,279.57/sq mi (880.15/km2) |
| Iowa | Adams County | 9.51/sq mi (3.67/km2) | Polk County | 750.51/sq mi (289.77/km2) |
| Kansas | Greeley County | 1.60/sq mi (0.62/km2) | Johnson County | 1,149.57/sq mi (443.85/km2) |
| Kentucky | Hickman County | 20.23/sq mi (7.81/km2) | Jefferson County | 1,948.11/sq mi (752.17/km2) |
| Louisiana | Cameron Parish | 5.32/sq mi (2.05/km2) | Orleans Parish | 2,029.41/sq mi (783.56/km2) |
| Maine | Piscataquis County | 4.42/sq mi (1.71/km2) | Cumberland County | 337.23/sq mi (130.21/km2) |
| Maryland | Garrett County | 46.51/sq mi (17.96/km2) | City of Baltimore | 7,671.51/sq mi (2,961.99/km2) |
| Massachusetts | Franklin County | 102.05/sq mi (39.40/km2) | Suffolk County | 12,416.78/sq mi (4,794.15/km2) |
| Michigan | Keweenaw County | 3.99/sq mi (1.54/km2) | Wayne County | 2,974.42/sq mi (1,148.43/km2) |
| Minnesota | Lake of the Woods County | 3.11/sq mi (1.20/km2) | Ramsey County | 3,341.64/sq mi (1,290.21/km2) |
| Mississippi | Issaquena County | 3.40/sq mi (1.31/km2) | DeSoto County | 338.66/sq mi (130.76/km2) |
| Missouri | Worth County | 8.14/sq mi (3.14/km2) | City of St. Louis | 5,157.48/sq mi (1,991.31/km2) |
| Montana | Garfield County | 0.25/sq mi (0.097/km2) | Yellowstone County | 56.19/sq mi (21.70/km2) |
| Nebraska | McPherson County | 0.63/sq mi (0.24/km2) | Douglas County | 1,574.37/sq mi (607.87/km2) |
| Nevada | Esmeralda County | 0.21/sq mi (0.081/km2) | Carson City | 382.09/sq mi (147.53/km2) |
| New Hampshire | Coos County | 18.41/sq mi (7.11/km2) | Hillsborough County | 457.37/sq mi (176.59/km2) |
| New Jersey | Salem County | 199.10/sq mi (76.87/km2) | Hudson County | 13,731.61/sq mi (5,301.80/km2) |
| New Mexico | Harding County | 0.32/sq mi (0.12/km2) | Bernalillo County | 570.76/sq mi (220.37/km2) |
| New York | Hamilton County | 2.81/sq mi (1.08/km2) | New York County | 69,468.42/sq mi (26,821.91/km2) |
| North Carolina | Hyde County | 9.48/sq mi (3.66/km2) | Mecklenburg County | 1,755.54/sq mi (677.82/km2) |
| North Dakota | Billings County | 0.68/sq mi (0.26/km2) | Cass County | 84.86/sq mi (32.76/km2) |
| Northern Mariana Islands | Northern Islands Municipality[note 14] | 0.00/sq mi (0/km2) | Saipan Municipality | 1,050.80/sq mi (405.72/km2) |
| Ohio | Monroe County | 32.12/sq mi (12.40/km2) | Cuyahoga County | 2,799.95/sq mi (1,081.07/km2) |
| Oklahoma | Cimarron County | 1.34/sq mi (0.52/km2) | Tulsa County | 1,058.14/sq mi (408.55/km2) |
| Oregon | Harney County | 0.73/sq mi (0.28/km2) | Multnomah County | 1,704.93/sq mi (658.28/km2) |
| Pennsylvania | Cameron County | 12.83/sq mi (4.95/km2) | Philadelphia County | 11,379.49/sq mi (4,393.65/km2) |
| Puerto Rico | Culebra Municipality | 156.40/sq mi (60.39/km2) | San Juan Municipality | 8,262.30/sq mi (3,190.09/km2) |
| Rhode Island | Washington County | 385.67/sq mi (148.91/km2) | Bristol County | 2,064.00/sq mi (796.91/km2) |
| South Carolina | Allendale County | 25.53/sq mi (9.86/km2) | Greenville County | 574.72/sq mi (221.90/km2) |
| South Dakota | Harding County | 0.47/sq mi (0.18/km2) | Minnehaha County | 209.95/sq mi (81.06/km2) |
| Tennessee | Perry County | 19.08/sq mi (7.37/km2) | Davidson County | 1,243.33/sq mi (480.05/km2) |
| Texas | Loving County | 0.12/sq mi (0.046/km2) | Dallas County | 2,718.00/sq mi (1,049.43/km2) |
| U.S. Minor Outlying Islands | 6 entities[note 15] | 0.00/sq mi (0/km2) | Wake Island | 39.80/sq mi (15.37/km2) |
| Utah | Garfield County | 0.99/sq mi (0.38/km2) | Salt Lake County | 1,387.14/sq mi (535.58/km2) |
| Vermont | Essex County | 9.50/sq mi (3.67/km2) | Chittenden County | 291.74/sq mi (112.64/km2) |
| Virgin Islands (U.S.) | Saint John Island | 211.80/sq mi (81.78/km2) | Saint Thomas Island | 1,649.10/sq mi (636.72/km2) |
| Virginia | Highland County | 5.59/sq mi (2.16/km2) | Alexandria City | 9,314.30/sq mi (3,596.27/km2) |
| Washington | Garfield County | 3.18/sq mi (1.23/km2) | King County | 912.87/sq mi (352.46/km2) |
| West Virginia | Pocahontas County | 9.27/sq mi (3.58/km2) | Ohio County | 419.98/sq mi (162.16/km2) |
| Wisconsin | Iron County | 7.80/sq mi (3.01/km2) | Milwaukee County | 3,925.95/sq mi (1,515.82/km2) |
| Wyoming | Niobrara County | 0.94/sq mi (0.36/km2) | Laramie County | 34.15/sq mi (13.19/km2) |
^ A: TheUnorganized Borough, Alaska, formed by theBorough Act of 1961, is a legal entity, run by the Alaska state government as an extension of State government,[12] it and the independently incorporated Unified, Home Rule, First Class and Second Class boroughs roughly correspond to parishes in Louisiana and to counties in the other 48 states.[13]
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