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List of counties in Iowa

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There are 99 counties in the U.S. state of Iowa. The first two counties, Des Moines County and Dubuque County, were formed in 1834 when Iowa was still part of the Michigan Territory. One of the most important days in Iowa county history was January 15, 1851, when 49 counties were created.[1]

Map of counties numbered as in the National Atlas of the United States

The Iowa Constitution of 1857, which is still in effect today, states that counties must have an area of at least 432 square miles (1,120 km2). No county can be reduced below that size by boundary changes.[2] Exceptions to this rule were granted, as ten counties have areas below this size. The smallest county (Dickinson) has a land area of 381 sq mi (990 km2), while the largest (Kossuth) has an area 973sq mi (2,520 km²). Polk County is the most densely populated county at 860 persons/sq mi,[3] and contains the state's capital and largest city, Des Moines.


County information

The number in the column headed "#" is the one used on the map from the National Atlas of the United States, shown on the left. The Federal Information Processing Standard (FIPS) code, which is used by the United States government to uniquely identify counties, is provided with each entry. The FIPS code for each county links to census data for that county.

County
FIPS code[4]County seat[5]#
Established[5][6]Formed from[7]Meaning of name[6]Map #
Population
(2020)[8]		Area[5]Map
Adair County001Greenfield01Jan 15, 1851Cass CountyJohn Adair, Kentucky Governor697,496569 sq mi
(1,474 km2)
Adams County003Corning02Jan 15, 1851Taylor CountyJohn Adams, US President813,704424 sq mi
(1,098 km2)
Allamakee County005Waukon03Feb 20, 1847Clayton CountyDisputed, possibly Allan Makee, early trader and guide for settlers, or Meskwaki anamiki and/or Ojibwe animikii both meaning thunder or thunderer[9]: 33 1114,061640 sq mi
(1,658 km2)
Appanoose County007Centerville04Feb 17, 1843Davis CountyChief Appanoose, headed peace party in the Black Hawk War9612,317496 sq mi
(1,285 km2)
Audubon County009Audubon05Jan 15, 1851Black Hawk County and Cass CountyJohn James Audubon, ornithologist and artist575,674443 sq mi
(1,147 km2)
Benton County011Vinton06Dec 21, 1837Native American lands and Wisconsin TerritoryThomas Hart Benton, Missouri Senator5125,575716 sq mi
(1,854 km2)
Black Hawk County013Waterloo07Feb 17, 1843Delaware CountyBlack Hawk, leader during Black Hawk War39131,144567 sq mi
(1,469 km2)
Boone County015Boone08Jan 13, 1846Polk CountyNathan Boone, one of the first to survey Iowa4726,715572 sq mi
(1,481 km2)
Bremer County017Waverly09Jan 15, 1851Native American lands and Winnebago CountyFredrika Bremer, Swedish poet and author3024,988428 sq mi
(1,109 km2)
Buchanan County019Independence10Dec 21, 1837Delaware County and Wisconsin TerritoryJames Buchanan, US President4020,565571 sq mi
(1,479 km2)
Buena Vista County021Storm Lake11Jan 15, 1851Clay County and Sac CountyBattle of Buena Vista, Mexican–American War2420,823575 sq mi
(1,489 km2)
Butler County023Allison12Jan 15, 1851Black Hawk County and Buchanan CountyWilliam Orlando Butler, War of 1812 hero2914,334580 sq mi
(1,502 km2)
Calhoun County025Rockwell City13Jan 15, 1851Fox County (renamed)John C. Calhoun, US Vice President349,927570 sq mi
(1,476 km2)
Carroll County027Carroll14Jan 15, 1851Guthrie CountyCharles Carroll, signatory of the Declaration of Independence4520,760569 sq mi
(1,474 km2)
Cass County029Atlantic15Jan 15, 1851Pottawattamie CountyLewis Cass, Michigan Senator6813,127564 sq mi
(1,461 km2)
Cedar County031Tipton16Dec 21, 1837Wisconsin TerritoryCedar River that runs through county6518,505580 sq mi
(1,502 km2)
Cerro Gordo County033Mason City17Jan 15, 1851Floyd CountyBattle of Cerro Gordo, Mexican–American War1743,127568 sq mi
(1,471 km2)
Cherokee County035Cherokee18Jan 15, 1851Crawford CountyCherokee People2311,658577 sq mi
(1,494 km2)
Chickasaw County037New Hampton19Jan 15, 1851Fayette CountyChickasaw People1912,012505 sq mi
(1,308 km2)
Clarke County039Osceola20Jan 13, 1846Lucas CountyJames Clarke, Governor of Iowa Territory839,748431 sq mi
(1,116 km2)
Clay County041Spencer21Jan 15, 1851Native American landsHenry Clay, Jr., officer in the Mexican–American War1416,384569 sq mi
(1,474 km2)
Clayton County043Elkader22Dec 21, 1837Dubuque County and Wisconsin TerritoryJohn M. Clayton, Delaware Senator2117,043779 sq mi
(2,018 km2)
Clinton County045Clinton23Dec 21, 1837Dubuque County and Wisconsin TerritoryDeWitt Clinton, New York Governor6646,460695 sq mi
(1,800 km2)
Crawford County047Denison24Jan 15, 1851Shelby CountyWilliam Harris Crawford, Georgia Senator4416,525714 sq mi
(1,849 km2)
Dallas County049Adel25Jan 13, 1846Polk CountyGeorge Mifflin Dallas, US Vice President5999,678586 sq mi
(1,518 km2)
Davis County051Bloomfield26Feb 17, 1843Van Buren CountyGarrett Davis, Kentucky Congressman979,110503 sq mi
(1,303 km2)
Decatur County053Leon27Jan 13, 1846Appanoose CountyStephen Decatur, War of 1812 naval officer947,645532 sq mi
(1,378 km2)
Delaware County055Manchester28Dec 21, 1837Dubuque County and Wisconsin TerritoryState of Delaware, home of Iowa statehood advocate US Senator John M. Clayton4117,488578 sq mi
(1,497 km2)
Des Moines County057Burlington29Sep 6, 1834Michigan Territory and Wisconsin TerritoryDes Moines River that once ran through the county8938,910416 sq mi
(1,077 km2)
Dickinson County059Spirit Lake30Jan 15, 1851Kossuth CountyDaniel Stevens Dickinson, New York Senator317,703381 sq mi
(987 km2)
Dubuque County061Dubuque31Sep 6, 1834Michigan Territory and Wisconsin TerritoryJulien Dubuque, first permanent white settler in Iowa4299,266608 sq mi
(1,575 km2)
Emmet County063Estherville32Jan 15, 1851Dickinson County and Kossuth CountyRobert Emmet, Irish revolutionary and American republican sympathizer49,388396 sq mi
(1,026 km2)
Fayette County065West Union33Dec 21, 1837Clayton County and Wisconsin TerritoryMarquis de Lafayette, Frenchman who aided colonial forces during American Revolutionary War2019,509731 sq mi
(1,893 km2)
Floyd County067Charles City34Jan 15, 1851Chickasaw CountyCharles Floyd, member of Lewis and Clark Expedition who died in Iowa1815,627501 sq mi
(1,298 km2)
Franklin County069Hampton35Jan 15, 1851Chickasaw CountyBenjamin Franklin, statesman and US founding father2810,019582 sq mi
(1,507 km2)
Fremont County071Sidney36Feb 24, 1847Pottawattamie CountyJohn Charles Fremont, Mexican–American War officer906,605511 sq mi
(1,323 km2)
Greene County073Jefferson37Jan 15, 1851Dallas CountyNathanael Greene, American Revolutionary War general468,771568 sq mi
(1,471 km2)
Grundy County075Grundy Center38Jan 15, 1851Black Hawk CountyFelix Grundy, Tennessee Congressman3812,329503 sq mi
(1,303 km2)
Guthrie County077Guthrie Center39Jul 8, 1851Jackson CountyEdwin B. Guthrie, Mexican–American War officer5810,623591 sq mi
(1,531 km2)
Hamilton County079Webster City40Dec 22, 1856Webster CountyWilliam W. Hamilton, President of Iowa Senate (1856–1857)3615,039577 sq mi
(1,494 km2)
Hancock County081Garner41Jan 15, 1851Wright CountyJohn Hancock, President of First Continental Congress1610,795571 sq mi
(1,479 km2)
Hardin County083Eldora42Jan 15, 1851Black Hawk CountyJohn J. Hardin, prominent soldier, Black Hawk War3716,878569 sq mi
(1,474 km2)
Harrison County085Logan43Jan 15, 1851Pottawattamie CountyWilliam Henry Harrison, US President5514,582697 sq mi
(1,805 km2)
Henry County087Mount Pleasant44Dec 7, 1836Wisconsin TerritoryDisputed, see reference[10]8820,482434 sq mi
(1,124 km2)
Howard County089Cresco45Jan 15, 1851Chickasaw CountyTilghman Howard, US Representative from Indiana99,469473 sq mi
(1,225 km2)
Humboldt County091Dakota City46Feb 26, 1857Webster CountyAlexander von Humboldt, German scientist269,597434 sq mi
(1,124 km2)
Ida County093Ida Grove47Jan 15, 1851Cherokee CountyEither Mount Ida in Greece or Ida Smith, child of early settlers[11]327,005432 sq mi
(1,119 km2)
Iowa County095Marengo48Feb 17, 1843Washington CountyIowa River that flows through the county6316,662586 sq mi
(1,518 km2)
Jackson County097Maquoketa49Dec 21, 1837Wisconsin TerritoryAndrew Jackson, US President5419,485636 sq mi
(1,647 km2)
Jasper County099Newton50Jan 13, 1846Mahaska CountyWilliam Jasper, American Revolutionary War sergeant6137,813730 sq mi
(1,891 km2)
Jefferson County101Fairfield51Jan 21, 1839Native American landsThomas Jefferson, US President8715,663435 sq mi
(1,127 km2)
Johnson County103Iowa City52Dec 21, 1837Des Moines County, Iowa and Wisconsin TerritoryRichard Mentor Johnson, US Vice President; officially renamed after Lulu Merle Johnson[12]64152,854614 sq mi
(1,590 km2)
Jones County105Anamosa53Dec 21, 1837Wisconsin TerritoryGeorge Wallace Jones, Iowa Senator5320,646575 sq mi
(1,489 km2)
Keokuk County107Sigourney54Dec 21, 1837Washington CountyChief Keokuk7410,033579 sq mi
(1,500 km2)
Kossuth County109Algona55Jan 15, 1851Webster CountyLajos Kossuth, Hungarian revolutionary inspired by American democratic ideals514,828973 sq mi
(2,520 km2)
Lee County111Fort Madison and Keokuk56Dec 7, 1836Des Moines CountyWilliam Elliott Lee, businessman from the New York Land Company, who sold the county's first tracts of land9933,555517 sq mi
(1,339 km2)
Linn County113Cedar Rapids57Dec 21, 1837Wisconsin TerritoryLewis Fields Linn, doctor and Missouri Senator52230,299718 sq mi
(1,860 km2)
Louisa County115Wapello58Dec 7, 1836Des Moines CountyDisputed, see reference[13]7610,837402 sq mi
(1,041 km2)
Lucas County117Chariton59Jan 13, 1846Monroe CountyRobert Lucas, first Governor of Iowa Territory848,634431 sq mi
(1,116 km2)
Lyon County119Rock Rapids60Jan 15, 1851Woodbury County, IowaNathaniel Lyon, first Union general to be killed in the American Civil War, (formerly named Buncombe County)111,934588 sq mi
(1,523 km2)
Madison County121Winterset61Jan 13, 1846Polk CountyJames Madison, US President7016,548561 sq mi
(1,453 km2)
Mahaska County123Oskaloosa62Feb 17, 1843Fox and Sac Indian landsChief Mahaska7322,190571 sq mi
(1,479 km2)
Marion County125Knoxville63Jun 10, 1845Washington CountyFrancis Marion, American Revolutionary War general7233,414554 sq mi
(1,435 km2)
Marshall County127Marshalltown64Jan 13, 1846Jasper CountyJohn Marshall, Chief Justice of the United States Supreme Court4940,105572 sq mi
(1,481 km2)
Mills County129Glenwood65Jan 15, 1851Pottawattamie CountyFrederick Mills, major killed during the Battle of Churubusco, Mexican–American War7914,484437 sq mi
(1,132 km2)
Mitchell County131Osage66Jan 15, 1851Chickasaw CountyJohn Mitchel, Irish revolutionary who operated out of the US810,565469 sq mi
(1,215 km2)
Monona County133Onawa67Jan 15, 1851Harrison CountyProbably from the name of a fictional Native American character in a play[9]: 295 438,751693 sq mi
(1,795 km2)
Monroe County135Albia68Feb 17, 1843Wapello CountyJames Monroe, US President857,577433 sq mi
(1,121 km2)
Montgomery County137Red Oak69Jan 15, 1851Polk CountyRichard Montgomery, American Revolutionary War general8010,330424 sq mi
(1,098 km2)
Muscatine County139Muscatine70Dec 7, 1836Des Moines Countydebated, possibly Mascouten People7743,235439 sq mi
(1,137 km2)
O'Brien County141Primghar71Jan 15, 1851Cherokee CountyWilliam Smith O'Brien, Irish revolutionary inspired by American democratic ideals1314,182573 sq mi
(1,484 km2)
Osceola County143Sibley72Jan 15, 1851Woodbury CountyOsceola, Seminole leader26,192399 sq mi
(1,033 km2)
Page County145Clarinda73Feb 24, 1847Pottawattamie CountyJohn Page, officer killed in Battle of Palo Alto, Mexican–American War9115,211535 sq mi
(1,386 km2)
Palo Alto County147Emmetsburg74Jan 15, 1851Kossuth CountyBattle of Palo Alto, Mexican–American War158,996564 sq mi
(1,461 km2)
Plymouth County149Le Mars75Jan 15, 1851Woodbury CountyPlymouth, Massachusetts2225,698864 sq mi
(2,238 km2)
Pocahontas County151Pocahontas76Jan 15, 1851Greene County and Humboldt CountyPocahontas, famous Native American woman257,078578 sq mi
(1,497 km2)
Polk County153Des Moines77Jan 13, 1846Native American landsJames K. Polk, US President60492,401570 sq mi
(1,476 km2)
Pottawattamie County155Council Bluffs78Feb 24, 1847Native American landsPotawatomi People6793,667954 sq mi
(2,471 km2)
Poweshiek County157Montezuma79Feb 17, 1843Meskwaki landsChief Poweshiek, Meskwaki6218,662585 sq mi
(1,515 km2)
Ringgold County159Mount Ayr80Feb 24, 1847Taylor CountySamuel Ringgold, major killed in the Mexican–American War934,663538 sq mi
(1,393 km2)
Sac County161Sac City81Jan 15, 1851Greene CountySauk (Sac) People339,814576 sq mi
(1,492 km2)
Scott County163Davenport82Dec 21, 1837Wisconsin TerritoryWinfield Scott, War of 1812 General78174,669458 sq mi
(1,186 km2)
Shelby County165Harlan83Jan 15, 1851Cass CountyIsaac Shelby, American Revolutionary War General, War of 18125611,746591 sq mi
(1,531 km2)
Sioux County167Orange City84Jan 15, 1851Plymouth CountySioux People1235,872768 sq mi
(1,989 km2)
Story County169Nevada85Jan 13, 1846Boone County, Jasper County, and Polk CountyJoseph Story, US Supreme Court Justice4898,537573 sq mi
(1,484 km2)
Tama County171Toledo86Feb 17, 1843Benton County and Boone CountyDisputed, see reference[14]5017,135721 sq mi
(1,867 km2)
Taylor County173Bedford87Feb 24, 1847Page CountyZachary Taylor, US President925,896534 sq mi
(1,383 km2)
Union County175Creston88Jan 15, 1851Clarke CountyThe union of the states8212,138424 sq mi
(1,098 km2)
Van Buren County177Keosauqua89Dec 7, 1836Des Moines CountyMartin Van Buren, US President987,203485 sq mi
(1,256 km2)
Wapello County179Ottumwa90Feb 17, 1843Native American landsChief Wapello8635,437432 sq mi
(1,119 km2)
Warren County181Indianola91Jan 13, 1846Polk CountyJoseph Warren, American Revolutionary War General7152,403572 sq mi
(1,481 km2)
Washington County183Washington92Jan 25, 1839Wisconsin TerritoryGeorge Washington, US President7522,565569 sq mi
(1,474 km2)
Wayne County185Corydon93Jan 13, 1846Appanoose CountyAnthony Wayne, American Revolutionary War General956,497526 sq mi
(1,362 km2)
Webster County187Fort Dodge94Jan 12, 1853Risley County and Yell County (defunct IA counties)[15]Daniel Webster, Massachusetts Senator3536,999715 sq mi
(1,852 km2)
Winnebago County189Forest City95Jan 15, 1851Kossuth CountyWinnebago (Ho–Chunk) People610,679400 sq mi
(1,036 km2)
Winneshiek County191Decorah96Feb 20, 1847Native American landsChief Winneshiek1020,070690 sq mi
(1,787 km2)
Woodbury County193Sioux City97Jan 12, 1853Wahkaw County (renamed), Polk CountyLevi Woodbury, New Hampshire Governor31105,941873 sq mi
(2,261 km2)
Worth County195Northwood98Jan 15, 1851Mitchell CountyWilliam Jenkins Worth, Black Hawk War and Mexican–American War officer77,443400 sq mi
(1,036 km2)
Wright County197Clarion99Jan 15, 1851Webster County and Kossuth CountySilas Wright, New York Governor, and Joseph Albert Wright, Indiana Governor (brothers)2712,943581 sq mi
(1,505 km2)

Old counties

The following counties no longer exist:[16]

References

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