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County-FIPS Code-County seat-County number-County established-Formed from-Etymology
Adair County 001 Greenfield 69-01-15 January 15, 1851 Cass County John Adair (1757–1840), sixth governor of Kentucky
Adams County 003 Corning 81-01-15 January 15, 1851 Taylor County John Adams, second President of the United States (1797–1801)
Allamakee County 005 Waukon 11-02-20 February 20, 1847 Clayton County Allen Magee (a.k.a. Allan Makee), an early Indian trader
Appanoose County 007 Centerville 96-02-17 February 17, 1843 Davis County Appanoose, Native American chief who headed peace party in the Black Hawk War
Audubon County 009 Audubon 57-01-15 January 15, 1851 Black Hawk County and Cass County John James Audubon (1785–1851), ornithologist and artist
Benton County 011 Vinton 51-12-21 December 21, 1837 Native American lands and Wisconsin Territory Thomas Hart Benton, United States Senator (1821–1851)
Black Hawk County 013 Waterloo 39-02-17 February 17, 1843 Delaware County Black Hawk (1767–1838), chief of Fox and Sac Indians and leader in the Black Hawk War
Boone County 015 Boone 47-01-13 January 13, 1846 Polk County Nathan Boone (1781–1863), one of the first to survey Iowa
Bremer County 017 Waverly 30-01-15 January 15, 1851 Native American lands and Winnebago County Fredrika Bremer (1801–1865), Swedish poet and author
Buchanan County 019 Independence 40-12-21 December 21, 1837 Delaware County and Wisconsin Territory James Buchanan, fifteenth President of the United States (1857–1861)
Buena Vista County 021 Storm Lake 24-01-15 January 15, 1851 Clay County and Sac County Battle of Buena Vista, a battle during the Mexican-American War
Butler County 023 Allison 29-01-15 January 15, 1851 Black Hawk County and Buchanan County William Orlando Butler (1791–1880), unsuccessful Democratic candidate for Vice President
Calhoun County 025 Rockwell City 34-01-15 January 15, 1851 Fox County (renamed) John Caldwell Calhoun, Vice President of the United States (1825–1832)
Carroll County 027 Carroll 45-01-15 January 15, 1851 Guthrie County Charles Carroll (1737–1832), longest lived signatory of the Declaration of Independence
Cass County 029 Atlantic 68-01-15 January 15, 1851 Pottawattamie County Lewis Cass, United States Senator from Michigan and unsuccessful candidate for President (1848)
Cedar County 031 Tipton 65-12-21 December 21, 1837 Wisconsin Territory Red Cedar River, river which runs through county
Cerro Gordo County 033 Mason City 17 01851-01-15 January 15, 1851 Floyd County Battle of Cerro Gordo, battle during the Mexican-American War
Cherokee County 035 Cherokee 23 01851-01-15 January 15, 1851 Crawford County Cherokee Native American tribe
Chickasaw County 037 New Hampton 19 01851-01-15 January 15, 1851 Fayette County Chickasaw Native American tribe
Clarke County 039 Osceola 83 01846-01-13 January 13, 1846 Lucas County James Clarke, third Governor of Iowa Territory (1845–1846)
Clay County 041 Spencer 14 01851-01-15 January 15, 1851 Native American lands Henry Clay, Jr. (1807–1847), officer in the Mexican-American War
Clayton County 043 Elkader 21 01837-12-21 December 21, 1837 Dubuque County and Wisconsin Territory John M. Clayton (1796–1856), United States Senator from Delaware
Clinton County 045 Clinton 66 01837-12-21 December 21, 1837 Dubuque County and Wisconsin Territory DeWitt Clinton (1769–1828), Governor of New York
Crawford County 047 Denison 44 01851-01-15 January 15, 1851 Shelby County William Harris Crawford (1772–1834), United States Senator from Georgia
Dallas County 049 Adel 59 01846-01-13 January 13, 1846 Polk County George Mifflin Dallas (1792–1864), eleventh Vice President of the United States
Davis County 051 Bloomfield 97 01843-02-17 February 17, 1843 Van Buren County Garrett Davis (1801–1872), congressman
Decatur County 053 Leon 94 01846-01-13 January 13, 1846 Appanoose County Stephen Decatur (1779–1820), naval officer in the War of 1812
Delaware County 055 Manchester 41 01837-12-21 December 21, 1837 Dubuque County and Wisconsin Territory Delaware, United States state, or Delaware County, New York
Des Moines County 057 Burlington 89 01834-09-06 September 6, 1834 Michigan Territory and Wisconsin Territory Des Moines River, river that once ran through the county
Dickinson County 059 Spirit Lake 3 01851-01-15 January 15, 1851 Kossuth County Daniel Stevens Dickinson (1800–1866), United States Senator from New York
Dubuque County 061 Dubuque 42 01834-09-06 September 6, 1834 Michigan Territory and Wisconsin Territory Julien Dubuque (1762–1810), first permanent white settler in Iowa
Emmet County 063 Estherville 4 01851-01-15 January 15, 1851 Dickinson County and Kossuth County Robert Emmet (1778–1803), Irish revolutionary
Fayette County 065 West Union 20 01837-12-21 December 21, 1837 Clayton County and Wisconsin Territory Marquis de Lafayette (1757–1834), Frenchman who helped the American Colonies in the Revolutionary War
Floyd County 067 Charles City 18 01851-01-15 January 15, 1851 Chickasaw County Charles Floyd (1782–1804), member of the Lewis and Clark Expedition who died in Iowa
Franklin County 069 Hampton 28 01851-01-15 January 15, 1851 Chickasaw County Benjamin Franklin (1706–1790), statesman
Fremont County 071 Sidney 90 01847-02-24 February 24, 1847 Pottawattamie County John Charles Fremont (1813–1890), officer in Mexican-American War
Greene County 073 Jefferson 46 01851-01-15 January 15, 1851 Dallas County Nathanael Greene (1742–1786), Revolutionary War general
Grundy County 075 Grundy Center 38 01851-01-15 January 15, 1851 Black Hawk County Felix Grundy (1777–1840), United States Senator
Guthrie County 077 Guthrie Center 58 01851-07-08 July 8, 1851 Jackson County Edwin B. Guthrie, officer in Mexican-American War
Hamilton County 079 Webster City 36 01856-12-22 December 22, 1856 Webster County William W. Hamilton, President of the Iowa Senate (1856–1857)
Hancock County 081 Garner 16 01851-01-15 January 15, 1851 Wright County John Hancock (1737–1793), President of the First Continental Congress
Hardin County 083 Eldora 37 01851-01-15 January 15, 1851 Black Hawk County John J. Hardin (1810–1847), prominent soldier in the Black Hawk War
Harrison County 085 Logan 55 01851-01-15 January 15, 1851 Pottawattamie County William Henry Harrison (1773–1841), ninth President of the United States
Henry County 087 Mount Pleasant 88 01836-12-07 December 7, 1836 Wisconsin Territory Either[11] Henry Dodge (1782–1867), governor of Wisconsin Territory; or James Dougherty Henry, general in the Black Hawk War
Howard County 089 Cresco 9 01851-01-15 January 15, 1851 Chickasaw County Tilghman Ashurst Howard (1797–1844), congressman 01225.0000001,225 km2)
Humboldt County 091 Dakota City 26 01857-02-26 February 26, 1857 Webster County Alexander von Humboldt (1769–1859), German scientist
Ida County 093 Ida Grove 32 01851-01-15 January 15, 1851 Cherokee County Mount Ida in Greece or the woman's name Ida
Iowa County 095 Marengo 63 01843-02-17 February 17, 1843 Washington County Iowa River, river that flows through the county, or Ioway Native American tribe
Jackson County 097 Maquoketa 54 01837-12-21 December 21, 1837 Wisconsin Territory Andrew Jackson (1767–1845), seventh President of the United States
Jasper County 099 Newton 61 01846-01-13 January 13, 1846 Mahaska County William Jasper (1750–1779), sergeant in the Revolutionary War
Jefferson County 101 Fairfield 87 01839-01-21 January 21, 1839 Native American lands Thomas Jefferson (1743–1826), third President of the United States
Johnson County 103 Iowa City 64 01837-12-21 December 21, 1837 Des Moines County, Iowa and Wisconsin Territory Richard Mentor Johnson (1780–1850), Vice President of the United States 1837-1841
Jones County 105 Anamosa 53 01837-12-21 December 21, 1837 Wisconsin Territory George Wallace Jones (1804–1896), United States Senator from Iowa
Keokuk County 107 Sigourney 74 01837-12-21 December 21, 1837 Washington County Keokuk (1767–1848), chief of the Sac Native American tribe
Kossuth County 109 Algona 5 01851-01-15 January 15, 1851 Webster County Lajos Kossuth (1802–1894), Hungarian patriot
Lee County 111 Fort Madison and Keokuk 99 01836-12-07 December 7, 1836 Des Moines County William Elliott Lee, businessman; or Robert E. Lee (1807–1870), Confederate general
Linn County 113 Cedar Rapids 52 01837-12-21 December 21, 1837 Wisconsin Territory Lewis Fields Linn (1795–1843), doctor and United States Senator from Missouri
Louisa County 115 Wapello 76 01836-12-07 December 7, 1836 Des Moines County Either[12] Louisa Massey, a woman who avenged the death of her brother; or Louisa County, Virginia
Lucas County 117 Chariton 84 01846-01-13 January 13, 1846 Monroe County Robert Lucas (1781–1853), first Governor of Iowa Territory
Lyon County 119 Rock Rapids 1 01851-01-15 January 15, 1851 Woodbury County, Iowa Nathaniel Lyon (1818–1861), first Union general to be killed in the American Civil War, (formerly named Buncombe County)
Madison County 121 Winterset 70 01846-01-13 January 13, 1846 Polk County James Madison (1751–1836), fourth President of the United States
Mahaska County 123 Oskaloosa 73 01843-02-17 February 17, 1843 Fox and Sac Indian lands Mahaska (1784–1834), chief of the Ioway Native American tribe
Marion County 125 Knoxville 72 01845-06-10 June 10, 1845 Washington County Francis Marion (1732–1795), general in the Revolutionary War
Marshall County 127 Marshalltown 49 01846-01-13 January 13, 1846 Jasper County John Marshall (1755–1835), fourth Chief Justice of the United States Supreme Court
Mills County 129 Glenwood 79 01851-01-15 January 15, 1851 Pottawattamie County Frederick Mills, major killed during the Battle of Churubusco in the Mexican-American War
Mitchell County 131 Osage 8 01851-01-15 January 15, 1851 Chickasaw County John Mitchel (1815–1875), Irish patriot
Monona County 133 Onawa 43 01851-01-15 January 15, 1851 Harrison County Word of Native American origin or Monona, Iowa
Monroe County 135 Albia 85 01843-02-17 February 17, 1843 Wapello County James Monroe (1758–1831), fifth President of the United States
Montgomery County 137 Red Oak 80 01851-01-15 January 15, 1851 Polk County Richard Montgomery (1738–1775), general in the Revolutionary War
Muscatine County 139 Muscatine 77 01836-12-07 December 7, 1836 Des Moines County Muscatine Native American tribe; or Muscatine Island in the Mississippi River
O'Brien County 141 Primghar 13 01851-01-15 January 15, 1851 Cherokee County William Smith O'Brien (1803–1864), Irish revolutionary
Osceola County 143 Sibley 2 01851-01-15 January 15, 1851 Woodbury County Osceola (1804–1838), Native American leader
Page County 145 Clarinda 91 01847-02-24 February 24, 1847 Pottawattamie County John Page, officer killed in Battle of Palo Alto in the Mexican-American War
Palo Alto County 147 Emmetsburg 15 01851-01-15 January 15, 1851 Kossuth County Battle of Palo Alto in the Mexican-American War
Plymouth County 149 Le Mars 22 01851-01-15 January 15, 1851 Woodbury County Landing place of the Pilgrims who came to America on the Mayflower
Pocahontas County 151 Pocahontas 25 01851-01-15 January 15, 1851 Greene County and Humboldt County Pocahantas (1595–1618), famous Native American woman
Polk County 153 Des Moines 60 01846-01-13 January 13, 1846 Native American lands James K. Polk (1795–1849), eleventh President of the United States
Pottawattamie County 155 Council Bluffs 67 01847-02-24 February 24, 1847 Native American lands Pottawattamie Native American tribe
Poweshiek County 157 Montezuma 62 01843-02-17 February 17, 1843 Mesquakie Indian lands Poweshiek, chief of the Fox tribe
Ringgold County 159 Mount Ayr 93 01847-02-24 February 24, 1847 Taylor County Samuel Ringgold (1796–1846), major killed in the Mexican-American War
Sac County 161 Sac City 33 01851-01-15 January 15, 1851 Greene County Sac Native American tribe
Scott County 163 Davenport 78 01837-12-21 December 21, 1837 Wisconsin Territory Winfield Scott (1786–1866), U.S. Army General during the War of 1812
Shelby County 165 Harlan 56 01851-01-15 January 15, 1851 Cass County Isaac Shelby (1750–1826), general in the Revolutionary War and the War of 1812
Sioux County 167 Orange City 12 01851-01-15 January 15, 1851 Plymouth County Sioux Native American tribe
Story County 169 Nevada 48 01846-01-13 January 13, 1846 Boone County, Jasper County, and Polk County Joseph Story (1779–1845), United States Supreme Court justice
Tama County 171 Toledo 50 01843-02-17 February 17, 1843 Benton County and Boone County Either[13] Taimah, Fox chief; or Taomah, wife of Poweshiek; or Potama, Native American chief
Taylor County 173 Bedford 92 01847-02-24 February 24, 1847 Page County Zachary Taylor (1784–1850), twelfth President of the United States
Union County 175 Creston 82 01851-01-15 January 15, 1851 Clarke County "The Union", name for the northern states during the American Civil War
Van Buren County 177 Keosauqua 98 01836-12-07 December 7, 1836 Des Moines County Martin Van Buren (1782–1862), eighth President of the United States
Wapello County 179 Ottumwa 86 01843-02-17 February 17, 1843 Native American lands Wapello, chief of the Fox Native American tribe
Warren County 181 Indianola 71 01846-01-13 January 13, 1846 Polk County Joseph Warren (1741–1775), General in the Revolutionary War
Washington County 183 Washington 75 01839-01-25 January 25, 1839 Wisconsin Territory George Washington (1732–1799), first President of the United States
Wayne County 185 Corydon 95 01846-01-13 January 13, 1846 Appanoose County Anthony Wayne (1745–1796), General in the Revolutionary War
Webster County 187 Fort Dodge 35 01853-01-12 January 12, 1853 Risley County and Yell County (defunct counties)[14] Daniel Webster (1782–1852), statesman
Winnebago County 189 Forest City 6 01851-01-15 January 15, 1851 Kossuth County Winnebago Native American tribe
Winneshiek County 191 Decorah 10 01847-02-20 February 20, 1847 Native American lands Winneshiek, chief of the Winnebago Native American tribe
Woodbury County 193 Sioux City 31 01853-01-12 January 12, 1853 Polk County Levi Woodbury (1789–1851), Governor of New Hampshire, (formerly named Wahkaw County)
Worth County 195 Northwood 7 01851-01-15 January 15, 1851 Mitchell County William Jenkins Worth (1794–1849), officer in the Black Hawk War and the Mexican-American War
Wright County 197 Clarion 27 01851-01-15 January 15, 1851 Webster County and Kossuth County Silas Wright (1795–1847), Governor of New York, and Joseph Albert Wright (1810–1867), Governor of Indiana