List of counties in Iowa

The US -American state of Iowa 's 99 counties divided. The official abbreviation for Iowa is IA and the FIPS code is 19 . The FIPS code of each individual county always starts with 19 , followed by the three-digit number given in the table for each county.

The population figures shown in the table are based on the results of the 2010 census .

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county	FIPS code	County Seat	founding	origin	Origin of name	Residents 2010	surface
Adair	001	Greenfield	1851	Cass County	John Adair (1757–1840) sixth Governor of Kentucky	7,682	1,474 km²
Adams	003	Corning	1851	Taylor County	John Adams second President of the United States (1797-1801)	4.029	1,098 km²
Allamakee	005	Waukon	1847	Clayton County	Allen Magee, a merchant who traded with the Indians	14,330	1,658 km²
Appanoosis	007	Centerville	1843	Davis County	Appanoose, Indian chief, the peace party in the Black Hawk War led	12,887	1,285 km²
Audubon	009	Audubon	1851	Black Hawk County and Cass County	John James Audubon (1785–1851), ornithologist and artist	6.119	1,147 km²
Benton	011	Vinton	1837	Indian Land and Wisconsin Territory	Thomas Hart Benton , US Senator (1821-1851)	26,076	1,854 km²
Black Hawk	013	Waterloo	1843	Delaware County	Black Hawk (1767–1838), chief of the Sauk and Fox in the Black Hawk War	131,090	1,469 km²
Boone	015	Boone	1847	Polk County	Nathan Boone (1781–1863), one of the first explorers of Iowa	26,306	1,481 km²
Bremer	017	Waverly	1853	Indian Land and Winnebago County	Fredrika Bremer (1801–1865), Swedish author and women's rights activist	24,276	1,109 km²
Buchanan	019	Independence	1837	Delaware County and Wisconsin Territory	James Buchanan , 15th President of the United States (1857–1861)	20,958	1,479 km²
Buena Vista	021	Storm Lake	1851	Clay County and Sac County	Battle of Buena Vista , a battle during the Mexican-American War	20,260	1,489 km²
butler	023	Allison	1851	Black Hawk County and Buchanan County	William Orlando Butler (1791–1880), unsuccessful Democratic candidate for the office of Vice President of the United States	14,867	1,502 km²
Calhoun	025	Rockwell City	1851	Fox County (renamed)	John C. Calhoun , U.S. Vice President (1825–1832)	9,670	1,476 km²
Carroll	027	Carroll	1851	Guthrie County	Charles Carroll (1737–1832), longest living signer of the US Declaration of Independence	20,816	1,474 km²
Cass	029	Atlantic	1851	Pottawattamie County	Lewis Cass , United States Senator from Michigan and Unsuccessful Presidential Candidate (1848)	13,956	1,461 km²
Cedar	031	Tipton	1837	Wisconsin Territory	Red Cedar River, the river that flows through the county	18,499	1,502 km²
Cerro Gordo	033	Mason City	1851	Floyd County	Battle of Cerro Gordo in the Mexican-American War	44.151	1,471 km²
Cherokee	035	Cherokee	1851	Crawford County	Indian tribe of the Cherokee	12,072	1,494 km²
Chickasaw	037	New Hampton	1851	Fayette County	Indian tribe of Chickasaw	12,439	1,308 km²
Clarke	039	Osceola	1846	Lucas County	James Clarke , third Iowa Territory Governor (1845–1846)	9,286	1,116 km²
Clay	041	Spencer	1851	Indian country	Henry Clay, Jr. (1807–1847), officer in the Mexican-American War	16,667	1,474 km²
Clayton	043	Elkader	1837	Dubuque County and Wisconsin Territory	John M. Clayton (1796-1856), Senator from Delaware	18,129	2,018 km²
Clinton	045	Clinton	1837	Dubuque County and Wisconsin Territory	DeWitt Clinton (1769–1828), Governor of New York	49,116	1,800 km²
Crawford	047	Denison	1851	Shelby County	William H. Crawford (1772-1834), Senator from Georgia , was one of the US government as finance minister and as minister of war in	17.096	1,849 km²
Dallas	049	Noble	1846	Polk County	George M. Dallas (1792–1864), eleventh Vice President of the United States	66,135	1,518 km²
Davis	051	Bloomfield	1843	Van Buren County	Garrett Davis (1801–1872), Congressman	8,753	1,303 km²
Decatur	053	Leon	1846	Appanoose County	Stephen Decatur (1779–1820), naval officer in the British-American War of 1812	8,457	1,378 km²
Delaware	055	Manchester	1837	Dubuque County and Wisconsin Territory	State of Delaware or Delaware County, New York State	17,764	1,497 km²
Des Moines	057	Burlington	1834	Michigan Territory and Wisconsin Territory	Des Moines River , The river that once flowed through the county	40,325	1,077 km²
Dickinson	059	Spirit Lake	1851	Kossuth County	Daniel S. Dickinson (1800–1866), Senator from New York	16,667	987 km²
Dubuque	061	Dubuque	1834	Michigan Territory and Wisconsin Territory	Julien Dubuque (1762–1810), first permanent white settler in Iowa	93,653	1,575 km²
Emmet	063	Estherville	1851	Dickinson County and Kossuth County	Robert Emmet (1778–1803), Irish rebel leader	10.302	1,026 km²
Fayette	065	West Union	1837	Clayton County and Wisconsin Territory	Marquis de Lafayette (1757-1834), French general who the American Revolutionary War Compatible	20,880	1,893 km²
Floyd	067	Charles City	1851	Chickasaw County	Charles Floyd (1782–1804), Lewis and Clark expedition member , who died in Iowa	16.303	1,298 km²
Franklin	069	Hampton	1851	Chickasaw County	Benjamin Franklin (1706–1790), one of the founding fathers of the USA	10,680	1,507 km²
Fremont	071	Sidney	1847	Pottawattamie County	John Charles Frémont (1813–1890), explorer and politician	7,441	1,323 km²
Greene	073	Jefferson	1851	Dallas County	Nathanael Greene (1742–1786), general in the American War of Independence	9,336	1,471 km²
Grundy	075	Grundy Center	1851	Black Hawk County	Felix Grundy (1777–1840), US Senator from Tennessee and US Attorney General	12,453	1,303 km²
Guthrie	077	Guthrie Center	1851	Jackson County	Edwin B. Guthrie , Mexican-American War officer	10,954	1,531 km²
Hamilton	079	Webster City	1856	Webster County	William W. Hamilton , President of the Senate from Iowa (1856-1857)	15,673	1,494 km²
Hancock	081	Garner	1851	Wright County	John Hancock (1737–1793), President of the Continental Congress (1775–1777)	11,341	1,479 km²
Hardin	083	Eldora	1851	Black Hawk County	John J. Hardin (1810-1847), Member of the House of Representatives and General of the Militia of Illinois	17,534	1,474 km²
Harrison	085	Logan	1851	Pottawattamie County	William H. Harrison (1773–1841), ninth President of the United States	14,928	1,805 km²
Henry	087	Mount Pleasant	1836	Wisconsin Territory	Henry Dodge (1782–1867), Governor of the Territory of Wisconsin or James Dougherty Henry , general in the Black Hawk War	20,145	1,124 km²
Howard	089	Cresco	1851	Chickasaw County	Tilghman Ashurst Howard (1797–1844), Member of the US House of Representatives	9,566	1,225 km²
Humboldt	091	Dakota City	1857	Webster County	Alexander von Humboldt (1769–1859), German scientist	9,815	1,124 km²
Ida	093	Ida Grove	1851	Cherokee County	Ida Mountains in Greece or the women's name Ida	7,089	1,119 km²
Iowa	095	Marengo	1843	Washington County	Iowa River , the river that flows through the county or the Iowa Indian tribe	16,355	1,518 km²
Jackson	097	Maquoketa	1837	Wisconsin Territory	Andrew Jackson (1767–1845), seventh President of the United States	19,848	1,647 km²
Jasper	099	Newton	1846	Mahaska County	William Jasper (1750–1779), sergeant and war hero in the American War of Independence	36,842	1,891 km²
Jefferson	101	Fairfield	1839	Indian country	Thomas Jefferson (1743–1826), third President of the United States	16,843	1,127 km²
Johnson	103	Iowa City	1837	Des Moines County and Wisconsin Territory	Richard M. Johnson (1780–1850), Vice President of the United States (1837–1841)	130,882	1,590 km²
Jones	105	Anamosa	1837	Wisconsin Territory	George W. Jones (1804-1896), Senator from Iowa	20,638	1,489 km²
Keokuk	107	Sigourney	1837	Washington County	Keokuk (1767–1848), chief of the Sauk Indian tribe	10,511	1,500 km²
Kossuth	109	Algona	1851	Webster County	Lajos Kossuth (1802-1894), Hungarian freedom fighter	15,543	2,520 km²
lee	111	Fort Madison and Keokuk	1851	Des Moines County	either William Elliott Lee (businessman) or Robert E. Lee (1807–1870), General in the Army of the Southern States	35,862	1,339 km²
Linn	113	Cedar Rapids	1837	Wisconsin Territory	Lewis F. Linn (1795–1843), physician and senator from Missouri	211,226	1,860 km²
Louisa	115	Wapello	1836	Des Moines County	Louisa in Virginia	11,387	1,041 km²
Lucas	117	Chariton	1846	Monroe County	Robert Lucas (1781–1853), first governor of the Iowa Territory	8,898	1,116 km²
Lyon	119	Rock Rapids	1851	Woodbury County	Nathaniel Lyon (1818–1861), first fallen general in the Union Army in the Civil War	11,581	1,523 km²
Madison	121	Winter set	1846	Polk County	James Madison (1751–1836), fourth President of the United States	15,679	1,453 km²
Mahaska	123	Oskaloosa	1843	Indian country of the Sauk and Fox	Mahaska (1784–1834), chief of the Iowa Indian tribe	22,381	1,479 km²
Marion	125	Knoxville	1845	Washington County	Francis Marion (1732–1795), general in the American War of Independence	33,309	1,435 km²
Marshall	127	Marshalltown	1846	Jasper County	John Marshall (1755–1835), fourth US Chief Justice	40,648	1,481 km²
Mills	129	Glenwood	1851	Pottawattamie County	Frederick Mills , officer, died in the Mexican-American War	15,059	1,132 km²
Mitchell	131	Osage	1851	Chickasaw County	John Mitchel (1815–1875), Irish rebel leader	10,776	1,215 km²
Monona	133	Onawa	1851	Harrison County	Monona in Clayton County , named after the Indian word Monona ( beautiful valley )	9,243	1,795 km²
Monroe	135	Albia	1843	Wapello County	James Monroe (1758–1831), fifth President of the United States	7,970	1,121 km²
Montgomery	137	Red Oak	1851	Polk County	Richard Montgomery (1738–1775), general in the American War of Independence	10,740	1,098 km²
Muscatine	139	Muscatine	1836	Des Moines County	Indian tribe of the Mascouten	42,745	1,137 km²
O'Brien	141	Primghar	1851	Cherokee County	William Smith O'Brien (1803–1864), Irish rebel leader	14,398	1,484 km²
Osceola	143	Sibley	1871	Woodbury County	Osceola (1804–1838), chief of the Seminole Indian tribe	6,462	1,033 km²
page	145	Clarinda	1847	Pottawattamie County	John Page , officer in the American Mexican War was	15,932	1,386 km²
Palo Alto	147	Emmetsburg	1851	Kossuth County	Battle of Palo Alto during the Mexican-American War	9,421	1,461 km²
Plymouth	149	Le Mars	1851	Woodbury County	Today's Plymouth , Massachusetts is the landing site of the Pilgrim Fathers who came to America on the Mayflower	24,986	2,238 km²
Pocahontas	151	Pocahontas	1851	Greene County and Humboldt County	Pocahontas (1595–1618), famous "Indian princess" from Virginia	7,310	1,497 km²
Polk	153	Des Moines	1846	Indian country	James K. Polk (1795–1849), eleventh President of the United States	430,640	1,476 km²
Pottawattamy	155	Council bluffs	1847	Indian country	Indian tribe of the Potawatomi	93,158	2,471 km²
Poweshiek	157	Montezuma	1843	Indian land of the Fox tribe	Poweshiek , chief of the Fox Indian tribe	18,914	1,515 km²
Ring gold	159	Mount Ayr	1847	Taylor County	Samuel Ringgold (1796–1846), officer, killed in the Mexican-American War	5.131	1,393 km²
Sac	161	Sac City	1851	Greene County	Indian tribe of the Sauk (also Sac )	10,350	1,492 km²
Scott	163	Davenport	1837	Wisconsin Territory	Winfield Scott (1786–1866), US general in the British-American War of 1812 and in the Mexican-American War	165.224	1,186 km²
Shelby	165	Harlan	1851	Cass County	Isaac Shelby (1750–1826), general in the American War of Independence and in the British-American War of 1812	12,167	1,531 km²
Sioux	167	Orange City	1851	Plymouth County	Indian tribe of the Sioux	33,704	1,989 km²
story	169	Nevada	1846	Boone County, Jasper County, and Polk County	Joseph Story (1779–1845), United States Supreme Court Justice	89,542	1,484 km²
Tama	171	Toledo	1843	Benton County and Boone County	either Taimah (chief of the Fox Indians), Taomah (wife of Chief Poweshiek ) or the Indian chief Potama	17,767	1,867 km²
Taylor	173	Bedford	1847	Page County	Zachary Taylor (1784–1850), 12th President of the United States	6.317	1,383 km²
union	175	Creston	1851	Clarke County	"The Union", name of the northern states during the Civil War	12,534	1,098 km²
Van Buren	177	Keosauqua	1836	Des Moines County	Martin Van Buren (1782–1862), eighth President of the United States	7,570	1,256 km²
Wapello	179	Ottumwa	1843	Indian country	Wapello, chief of the Fox	35,625	1,119 km²
Warren	181	Indianola	1846	Polk County	Joseph Warren (1741–1775), general in the American War of Independence	46.225	1,481 km²
Washington	183	Washington	1839	Wisconsin Territory	George Washington (1732–1799), first President of the United States	21,704	1,474 km²
Wayne	185	Corydon	1846	Appanoose County	Anthony Wayne (1745–1796), general in the American Revolutionary War	6,403	1,362 km²
Webster	187	Fort Dodge	1853	Risley County and Yell County , (disbanded)	Daniel Webster (1782-1852), Senator from Massachusetts and Foreign Minister	38.013	1,852 km²
Winnebago	189	Forest City	1851	Kossuth County	the Indian strain of Winnebago	10,866	1,036 km²
Winneshiek	191	Decorah	1847	Indian country	Winneshiek, chief of the Winnebago Indian tribe	21,056	1,787 km²
Woodbury	193	Sioux City	1853	Polk County	Levi Woodbury (1789-1851), Governor of New Hampshire	102.172	2,261 km²
Worth	195	Northwood	1851	Mitchell County	William Jenkins Worth (1794–1849), officer in the Black Hawk War and the Mexican-American War	7,598	1,036 km²
Wright	197	Clarion	1851	Webster County and Kossuth County	Silas Wright (1795–1847), Governor of New York and Joseph Wright (1810–1867), Governor of Indiana	13,229	1,505 km²