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Counties of Iowa
LO SX OA OB DK CY ET PL KH WN HK WT CE MT FD HW CW WH AM CT FT BM BT FN WR HB PT BV CK PM WD IA SA CH WB HM HA GN BH BC DW DB JK JN LN BE TM MR SR BN GR CR CF MN HR SH AB GT DA PK JP PH IW JH CD CN ST MC LA WS KK MK MA WA MD AD CA PW ML MM AA UN CL LC MO WP JF HN DM LE VB DV AN WE DT RN TA PA FM
Location	State of Iowa
Number	99
Populations	3,544 (Adams) – 505,255 (Polk)
Areas	381 square miles (990 km) (Dickinson) – 973 square miles (2,520 km) (Kossuth)
Government	County government
Subdivisions	cities, towns, townships, unincorporated communities, census designated place

There are 99 counties in the U.S. state of Iowa. The first two counties, Des Moines County and Dubuque County, were created in 1834 when Iowa was still part of the Michigan Territory. In preparation for Michigan's statehood, part of Michigan Territory was formed into Wisconsin Territory in 1836. Two years later, the western portion was split off to become Iowa Territory. The south-eastern part of Iowa Territory became Iowa, the 29th state in the union, on December 28, 1846, by which point 44 counties had been created. Counties continued to be created by the state government until 1857, when the last county, Humboldt County, was created. One of the most significant days in Iowa county history was January 15, 1851, on which 49 counties were created.

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 km), and no county may be reduced below that size by boundary changes. However, exceptions to this rule were granted, as ten counties have areas below this size. (The table below shows land area, but the Constitution deals with total area.) The smallest county (Dickinson) has a land area of 381 sq mi (990 km), while the largest (Kossuth) has an area 973 sq mi (2,520 km). Polk County is the most densely populated county at 864/sq mi (333.5/km), an increase in density from 2010 when it was 655.5/sq mi (253.08/km). Polk County contains the state's capital and largest city, Des Moines. In addition, Iowa has one of the smallest percentages of counties whose boundaries are dictated by natural means, the vast majority of which are being formed by lines of survey instead, resulting in many "box counties".

County information

The Federal Information Processing Standard (FIPS) code, 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. The column labeled '#' is the official county number when listed alphabetically. This number is used for many governmental and organizational purposes, including state income tax preparation. From 1922 to 1978, it was also used on Iowa license plates until it was replaced by the full county name. Finally, the number in the column headed "Map #" is used by the National Atlas of the United States, shown on the left; for purposes of the National Atlas, counties are numbered in geographical order beginning in the NW corner of the map.

County	FIPS code	County seat	#	Est.	Formed from	Etymology	Map #	Population	Area	Map
Adair County	001	Greenfield	01	Jan 15, 1851	Cass County	John Adair, Kentucky Governor	69	7,389	569 sq mi (1,474 km)
Adams County	003	Corning	02	Jan 15, 1851	Taylor County	John Adams, US President	81	3,544	424 sq mi (1,098 km)
Allamakee County	005	Waukon	03	Feb 20, 1847	Clayton County	Disputed, possibly Allan Makee, early trader and guide for settlers, or Meskwaki anamiki and/or Ojibwe animikii both meaning thunder or thunderer	11	14,074	640 sq mi (1,658 km)
Appanoose County	007	Centerville	04	Feb 17, 1843	Davis County	Chief Appanoose, headed peace party in the Black Hawk War	96	12,119	496 sq mi (1,285 km)
Audubon County	009	Audubon	05	Jan 15, 1851	Black Hawk County and Cass County	John James Audubon, ornithologist and artist	57	5,534	443 sq mi (1,147 km)
Benton County	011	Vinton	06	Dec 21, 1837	Native American lands and Wisconsin Territory	Thomas Hart Benton, Missouri Senator	51	25,796	716 sq mi (1,854 km)
Black Hawk County	013	Waterloo	07	Feb 17, 1843	Delaware County	Black Hawk, leader during Black Hawk War	39	130,471	567 sq mi (1,469 km)
Boone County	015	Boone	08	Jan 13, 1846	Polk County	Nathan Boone, one of the first to survey Iowa	47	26,590	572 sq mi (1,481 km)
Bremer County	017	Waverly	09	Jan 15, 1851	Native American lands and Winnebago County	Fredrika Bremer, Swedish poet and author	30	25,307	428 sq mi (1,109 km)
Buchanan County	019	Independence	10	Dec 21, 1837	Delaware County and Wisconsin Territory	James Buchanan, US President	40	20,691	571 sq mi (1,479 km)
Buena Vista County	021	Storm Lake	11	Jan 15, 1851	Clay County and Sac County	Battle of Buena Vista, Mexican–American War	24	20,567	575 sq mi (1,489 km)
Butler County	023	Allison	12	Jan 15, 1851	Black Hawk County and Buchanan County	William Orlando Butler, War of 1812 hero	29	14,172	580 sq mi (1,502 km)
Calhoun County	025	Rockwell City	13	Jan 15, 1851	Fox County (renamed)	John C. Calhoun, US Vice President	34	9,763	570 sq mi (1,476 km)
Carroll County	027	Carroll	14	Jan 15, 1851	Guthrie County	Charles Carroll, signatory of the Declaration of Independence	45	20,522	569 sq mi (1,474 km)
Cass County	029	Atlantic	15	Jan 15, 1851	Pottawattamie County	Lewis Cass, Michigan Senator	68	13,130	564 sq mi (1,461 km)
Cedar County	031	Tipton	16	Dec 21, 1837	Wisconsin Territory	Cedar River that runs through county	65	18,302	580 sq mi (1,502 km)
Cerro Gordo County	033	Mason City	17	Jan 15, 1851	Floyd County	Battle of Cerro Gordo, Mexican–American War	17	42,406	568 sq mi (1,471 km)
Cherokee County	035	Cherokee	18	Jan 15, 1851	Crawford County	Cherokee People	23	11,605	577 sq mi (1,494 km)
Chickasaw County	037	New Hampton	19	Jan 15, 1851	Fayette County	Chickasaw People	19	11,658	505 sq mi (1,308 km)
Clarke County	039	Osceola	20	Jan 13, 1846	Lucas County	James Clarke, Governor of Iowa Territory	83	9,588	431 sq mi (1,116 km)
Clay County	041	Spencer	21	Jan 15, 1851	Native American lands	Henry Clay, Jr., officer in the Mexican–American War	14	16,511	569 sq mi (1,474 km)
Clayton County	043	Elkader	22	Dec 21, 1837	Dubuque County and Wisconsin Territory	John M. Clayton, Delaware Senator	21	16,969	779 sq mi (2,018 km)
Clinton County	045	Clinton	23	Dec 21, 1837	Dubuque County and Wisconsin Territory	DeWitt Clinton, New York Governor	66	46,158	695 sq mi (1,800 km)
Crawford County	047	Denison	24	Jan 15, 1851	Shelby County	William Harris Crawford, Georgia Senator	44	16,013	714 sq mi (1,849 km)
Dallas County	049	Adel	25	Jan 13, 1846	Polk County	George Mifflin Dallas, US Vice President	59	111,092	586 sq mi (1,518 km)
Davis County	051	Bloomfield	26	Feb 17, 1843	Van Buren County	Garrett Davis, Kentucky Congressman	97	9,169	503 sq mi (1,303 km)
Decatur County	053	Leon	27	Jan 13, 1846	Appanoose County	Stephen Decatur, War of 1812 naval officer	94	7,665	532 sq mi (1,378 km)
Delaware County	055	Manchester	28	Dec 21, 1837	Dubuque County and Wisconsin Territory	State of Delaware, home of Iowa statehood advocate US Senator John M. Clayton	41	17,600	578 sq mi (1,497 km)
Des Moines County	057	Burlington	29	Sep 6, 1834	Michigan Territory and Wisconsin Territory	Des Moines River that once ran through the county	89	38,253	416 sq mi (1,077 km)
Dickinson County	059	Spirit Lake	30	Jan 15, 1851	Kossuth County	Daniel Stevens Dickinson, New York Senator	3	18,056	381 sq mi (987 km)
Dubuque County	061	Dubuque	31	Sep 6, 1834	Michigan Territory and Wisconsin Territory	Julien Dubuque, first permanent white settler in Iowa	42	98,887	608 sq mi (1,575 km)
Emmet County	063	Estherville	32	Jan 15, 1851	Dickinson County and Kossuth County	Robert Emmet, Irish revolutionary and American republican sympathizer	4	9,229	396 sq mi (1,026 km)
Fayette County	065	West Union	33	Dec 21, 1837	Clayton County and Wisconsin Territory	Marquis de Lafayette, Frenchman who aided colonial forces during American Revolutionary War	20	19,210	731 sq mi (1,893 km)
Floyd County	067	Charles City	34	Jan 15, 1851	Chickasaw County	Charles Floyd, member of Lewis and Clark Expedition who died in Iowa	18	15,326	501 sq mi (1,298 km)
Franklin County	069	Hampton	35	Jan 15, 1851	Chickasaw County	Benjamin Franklin, statesman and US founding father	28	9,875	582 sq mi (1,507 km)
Fremont County	071	Sidney	36	Feb 24, 1847	Pottawattamie County	John Charles Fremont, Mexican–American War officer	90	6,458	511 sq mi (1,323 km)
Greene County	073	Jefferson	37	Jan 15, 1851	Dallas County	Nathanael Greene, American Revolutionary War general	46	8,584	568 sq mi (1,471 km)
Grundy County	075	Grundy Center	38	Jan 15, 1851	Black Hawk County	Felix Grundy, Tennessee Congressman	38	12,384	503 sq mi (1,303 km)
Guthrie County	077	Guthrie Center	39	Jul 8, 1851	Jackson County	Edwin B. Guthrie, Mexican–American War officer	58	10,722	591 sq mi (1,531 km)
Hamilton County	079	Webster City	40	Dec 22, 1856	Webster County	William W. Hamilton, President of Iowa Senate (1856–1857)	36	14,729	577 sq mi (1,494 km)
Hancock County	081	Garner	41	Jan 15, 1851	Wright County	John Hancock, President of First Continental Congress	16	10,615	571 sq mi (1,479 km)
Hardin County	083	Eldora	42	Jan 15, 1851	Black Hawk County	John J. Hardin, prominent soldier, Black Hawk War	37	16,463	569 sq mi (1,474 km)
Harrison County	085	Logan	43	Jan 15, 1851	Pottawattamie County	William Henry Harrison, US President	55	14,670	697 sq mi (1,805 km)
Henry County	087	Mount Pleasant	44	Dec 7, 1836	Wisconsin Territory	Disputed, see reference	88	19,547	434 sq mi (1,124 km)
Howard County	089	Cresco	45	Jan 15, 1851	Chickasaw County	Tilghman Howard, US Representative from Indiana	9	9,376	473 sq mi (1,225 km)
Humboldt County	091	Dakota City	46	Feb 26, 1857	Webster County	Alexander von Humboldt, German scientist	26	9,500	434 sq mi (1,124 km)
Ida County	093	Ida Grove	47	Jan 15, 1851	Cherokee County	Either Mount Ida in Greece or Ida Smith, child of early settlers	32	6,833	432 sq mi (1,119 km)
Iowa County	095	Marengo	48	Feb 17, 1843	Washington County	Iowa River that flows through the county	63	16,381	586 sq mi (1,518 km)
Jackson County	097	Maquoketa	49	Dec 21, 1837	Wisconsin Territory	Andrew Jackson, US President	54	19,342	636 sq mi (1,647 km)
Jasper County	099	Newton	50	Jan 13, 1846	Mahaska County	William Jasper, American Revolutionary War sergeant	61	37,919	730 sq mi (1,891 km)
Jefferson County	101	Fairfield	51	Jan 21, 1839	Native American lands	Thomas Jefferson, US President	87	15,440	435 sq mi (1,127 km)
Johnson County	103	Iowa City	52	Dec 21, 1837	Des Moines County, Iowa and Wisconsin Territory	Richard Mentor Johnson, US Vice President; officially renamed after Lulu Johnson (1907-1995)	64	157,528	614 sq mi (1,590 km)
Jones County	105	Anamosa	53	Dec 21, 1837	Wisconsin Territory	George Wallace Jones, Iowa Senator	53	20,900	575 sq mi (1,489 km)
Keokuk County	107	Sigourney	54	Dec 21, 1837	Washington County	Chief Keokuk	74	9,914	579 sq mi (1,500 km)
Kossuth County	109	Algona	55	Jan 15, 1851	Webster County	Lajos Kossuth, Hungarian revolutionary inspired by American democratic ideals	5	14,396	973 sq mi (2,520 km)
Lee County	111	Fort Madison and Keokuk	56	Dec 7, 1836	Des Moines County	William Elliott Lee, businessman from the New York Land Company, who sold the county's first tracts of land	99	32,565	517 sq mi (1,339 km)
Linn County	113	Cedar Rapids	57	Dec 21, 1837	Wisconsin Territory	Lewis Fields Linn, doctor and Missouri Senator	52	228,972	718 sq mi (1,860 km)
Louisa County	115	Wapello	58	Dec 7, 1836	Des Moines County	Disputed, see reference	76	10,513	402 sq mi (1,041 km)
Lucas County	117	Chariton	59	Jan 13, 1846	Monroe County	Robert Lucas, first Governor of Iowa Territory	84	8,747	431 sq mi (1,116 km)
Lyon County	119	Rock Rapids	60	Jan 15, 1851	Woodbury County, Iowa	Nathaniel Lyon, first Union general to be killed in the American Civil War, (formerly named Buncombe County)	1	12,324	588 sq mi (1,523 km)
Madison County	121	Winterset	61	Jan 13, 1846	Polk County	James Madison, US President	70	16,971	561 sq mi (1,453 km)
Mahaska County	123	Oskaloosa	62	Feb 17, 1843	Fox and Sac Indian lands	Chief Mahaska	73	21,874	571 sq mi (1,479 km)
Marion County	125	Knoxville	63	Jun 10, 1845	Washington County	Francis Marion, American Revolutionary War general	72	33,770	554 sq mi (1,435 km)
Marshall County	127	Marshalltown	64	Jan 13, 1846	Jasper County	John Marshall, Chief Justice of the United States Supreme Court	49	40,014	572 sq mi (1,481 km)
Mills County	129	Glenwood	65	Jan 15, 1851	Pottawattamie County	Frederick Mills, major killed during the Battle of Churubusco, Mexican–American War	79	14,633	437 sq mi (1,132 km)
Mitchell County	131	Osage	66	Jan 15, 1851	Chickasaw County	John Mitchel, Irish revolutionary who operated out of the US	8	10,518	469 sq mi (1,215 km)
Monona County	133	Onawa	67	Jan 15, 1851	Harrison County	Probably from the name of a fictional Native American character in a play	43	8,493	693 sq mi (1,795 km)
Monroe County	135	Albia	68	Feb 17, 1843	Wapello County	James Monroe, US President	85	7,504	433 sq mi (1,121 km)
Montgomery County	137	Red Oak	69	Jan 15, 1851	Polk County	Richard Montgomery, American Revolutionary War general	80	10,139	424 sq mi (1,098 km)
Muscatine County	139	Muscatine	70	Dec 7, 1836	Des Moines County	debated, possibly Mascouten People	77	42,218	439 sq mi (1,137 km)
O'Brien County	141	Primghar	71	Jan 15, 1851	Cherokee County	William Smith O'Brien, Irish revolutionary inspired by American democratic ideals	13	14,012	573 sq mi (1,484 km)
Osceola County	143	Sibley	72	Jan 15, 1851	Woodbury County	Osceola, Seminole leader	2	5,978	399 sq mi (1,033 km)
Page County	145	Clarinda	73	Feb 24, 1847	Pottawattamie County	John Page, officer killed in Battle of Palo Alto, Mexican–American War	91	15,014	535 sq mi (1,386 km)
Palo Alto County	147	Emmetsburg	74	Jan 15, 1851	Kossuth County	Battle of Palo Alto, Mexican–American War	15	8,810	564 sq mi (1,461 km)
Plymouth County	149	Le Mars	75	Jan 15, 1851	Woodbury County	Plymouth, Massachusetts	22	25,722	864 sq mi (2,238 km)
Pocahontas County	151	Pocahontas	76	Jan 15, 1851	Greene County and Humboldt County	Pocahontas, famous Native American woman	25	6,976	578 sq mi (1,497 km)
Polk County	153	Des Moines	77	Jan 13, 1846	Native American lands	James K. Polk, US President	60	505,255	570 sq mi (1,476 km)
Pottawattamie County	155	Council Bluffs	78	Feb 24, 1847	Native American lands	Potawatomi People	67	93,179	954 sq mi (2,471 km)
Poweshiek County	157	Montezuma	79	Feb 17, 1843	Meskwaki lands	Chief Poweshiek, Meskwaki	62	18,453	585 sq mi (1,515 km)
Ringgold County	159	Mount Ayr	80	Feb 24, 1847	Taylor County	Samuel Ringgold, major killed in the Mexican–American War	93	4,642	538 sq mi (1,393 km)
Sac County	161	Sac City	81	Jan 15, 1851	Greene County	Sauk (Sac) People	33	9,686	576 sq mi (1,492 km)
Scott County	163	Davenport	82	Dec 21, 1837	Wisconsin Territory	Winfield Scott, War of 1812 General	78	174,270	458 sq mi (1,186 km)
Shelby County	165	Harlan	83	Jan 15, 1851	Cass County	Isaac Shelby, American Revolutionary War General, War of 1812	56	11,806	591 sq mi (1,531 km)
Sioux County	167	Orange City	84	Jan 15, 1851	Plymouth County	Sioux People	12	36,246	768 sq mi (1,989 km)
Story County	169	Nevada	85	Jan 13, 1846	Boone County, Jasper County, and Polk County	Joseph Story, US Supreme Court Justice	48	98,566	573 sq mi (1,484 km)
Tama County	171	Toledo	86	Feb 17, 1843	Benton County and Boone County	Disputed, see reference	50	16,833	721 sq mi (1,867 km)
Taylor County	173	Bedford	87	Feb 24, 1847	Page County	Zachary Taylor, US President	92	5,924	534 sq mi (1,383 km)
Union County	175	Creston	88	Jan 15, 1851	Clarke County	The union of the states	82	11,906	424 sq mi (1,098 km)
Van Buren County	177	Keosauqua	89	Dec 7, 1836	Des Moines County	Martin Van Buren, US President	98	7,266	485 sq mi (1,256 km)
Wapello County	179	Ottumwa	90	Feb 17, 1843	Native American lands	Chief Wapello	86	35,166	432 sq mi (1,119 km)
Warren County	181	Indianola	91	Jan 13, 1846	Polk County	Joseph Warren, American Revolutionary War General	71	55,205	572 sq mi (1,481 km)
Washington County	183	Washington	92	Jan 25, 1839	Wisconsin Territory	George Washington, US President	75	22,560	569 sq mi (1,474 km)
Wayne County	185	Corydon	93	Jan 13, 1846	Appanoose County	Anthony Wayne, American Revolutionary War General	95	6,557	526 sq mi (1,362 km)
Webster County	187	Fort Dodge	94	Jan 12, 1853	Risley County and Yell County (defunct IA counties)	Daniel Webster, Massachusetts Senator	35	36,485	715 sq mi (1,852 km)
Winnebago County	189	Forest City	95	Jan 15, 1851	Kossuth County	Winnebago (Ho–Chunk) People	6	10,571	400 sq mi (1,036 km)
Winneshiek County	191	Decorah	96	Feb 20, 1847	Native American lands	Chief Winneshiek	10	19,815	690 sq mi (1,787 km)
Woodbury County	193	Sioux City	97	Jan 12, 1853	Wahkaw County (renamed), Polk County	Levi Woodbury, New Hampshire Governor	31	105,951	873 sq mi (2,261 km)
Worth County	195	Northwood	98	Jan 15, 1851	Mitchell County	William Jenkins Worth, Black Hawk War and Mexican–American War officer	7	7,297	400 sq mi (1,036 km)
Wright County	197	Clarion	99	Jan 15, 1851	Webster County and Kossuth County	Silas Wright, New York Governor, and Joseph Albert Wright, Indiana Governor (brothers)	27	12,656	581 sq mi (1,505 km)

Former counties

The following counties no longer exist:

• Bancroft (1851–1855), merged with Kossuth County
• Cook (1836–1837), merged with Muscatine County
• Crocker (1870–1871), merged with Kossuth County
• Risley (1851–1853), formed Hamilton County
• Yell (1851–1853), formed Webster County

Proposed counties

• Larrabee (proposed 1913, failed 1914. Seceded from Kossuth County)

See also

• List of cities in Iowa
• List of townships in Iowa

References

1. "The Creation of Wisconsin Territory". Wisconsin Historical Society. Retrieved August 17, 2008.
2. "Chronology of Wisconsin History". Ney Family History. Archived from the original on May 19, 2008. Retrieved August 17, 2008.
3. "Statehood Dates". 50states.com. Retrieved August 17, 2008.
4. ^ National Association of Counties. "NACo - Find a county". Archived from the original on April 10, 2005. Retrieved April 30, 2008.
5. "Iowa: Consolidated Chronology of State and County Boundaries". Archived from the original on April 16, 2009. Retrieved May 25, 2008.
6. ^ "Iowa Commentary". Iowa Atlas of Historical County Boundaries. Archived from the original on October 15, 2008. Retrieved August 16, 2008.
7. U.S. Census Bureau. "Polk County Quickfacts". State & County QuickFacts. Archived from the original on July 29, 2011. Retrieved September 3, 2021.
8. "Iowa County Names and Numbers" (PDF). Iowa Department of Revenue. Archived from the original (PDF) on March 23, 2017. Retrieved June 8, 2018.
9. "Iowa License Plate: County Codes". Archived from the original on December 19, 2018. Retrieved June 8, 2018.
10. "EPA County FIPS Code Listing". EPA.gov. Retrieved February 23, 2008.
11. ^ Pratt, LeRoy G. (1977). The Counties and Courthouses of Iowa. Mason City, Iowa: Klipto Printing and Office Supply Company.
12. "Formation of Counties in Iowa". Retrieved December 24, 2015.
13. "U.S. Census Bureau QuickFacts: Iowa". United States Census Bureau. Retrieved April 21, 2024.
14. ^ Bright, William (2004). Native American Placenames of the United States. Norman, Oklahoma: University of Oklahoma Press. ISBN 978-0-8061-3598-4.
15. "Henry County, Iowa". Retrieved August 17, 2008. According to most sources, Henry County (440 square miles) was named for Henry Dodge (1782-1867), who served in the Black Hawk War and other Indian wars and governor of Wisconsin Territory (1836-1841); others credit the county's name to General James Dougherty Henry (1797-1834), a hero of the Black Hawk War.
16. Savage, Tom (2007). A Dictionary of Iowa Place-names. Iowa City: University of Iowa Press. p. 9. ISBN 1-58729-531-8.
17. Doubek, James (June 27, 2021). "Johnson County, Iowa, Renames Itself After A Different Johnson". National Public Radio. Retrieved June 28, 2021.
18. "Louisa County, Iowa". Official website. Retrieved August 17, 2008. According to some authorities, the county was named for Louisa Massey, who gained fame during her time because she avenged the murder of her brother by shooting the man responsible. Other historians claim the name was given in honor of Louisa County, Virginia. There are 418 square miles (1,080 km) in Louisa County.
19. John Adams, Tama County Auditor (2002). "Tama County, Iowa". e-referencedesk.com. Clarksville, VA: Web Marketing Services, Inc. LLC. Archived from the original on June 6, 2011. Retrieved October 2, 2008. The origin of the naming of Tama County is somewhat disputed. Some authorities say the name comes from Taimah, a Fox Indian Chief. Others say it comes from Taomah, wife of Poweshiek--another Fox Indian Tribe Chief. Still others say the county is named after the Indian Chief Potama or Pottama.
20. Pratt, H. M. (1913). History of Fort Dodge and Webster County, Iowa.
21. "Iowa County Formation Table". Iowa Genweb Project. Retrieved December 24, 2015.
22. "Bancroft County, Iowa". Archived from the original on July 27, 2011. Retrieved August 16, 2008.
23. "Cook County, Iowa". Archived from the original on July 14, 2004. Retrieved August 16, 2008.
24. "Crocker County, Iowa". Archived from the original on July 15, 2004. Retrieved August 16, 2008.
25. "Risley County, Iowa". Archived from the original on February 20, 2016. Retrieved August 16, 2008.
26. "Yell County, Iowa". Archived from the original on July 20, 2004. Retrieved August 16, 2008.
27. "What happened to Iowa's 100th county?". The Gazette. April 21, 2019. pp. P6. Retrieved May 13, 2024.

External links

• Iowa: Individual County Chronologies

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