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 |
County seat |
# |
Established |
Formed from |
Etymology |
Population |
Area |
Map |
|---|---|---|---|---|---|---|---|---|---|
| Adair County | 001 | Greenfield | 69 | 01851-01-15January 15, 1851 | Cass County | John Adair (1757–1840), sixth governor of Kentucky | 70037682000000000007,682 | 7002569000000000000569 sq mi (70031474000000000001,474 km2) |
|
| Adams County | 003 | Corning | 81 | 01851-01-15January 15, 1851 | Taylor County | John Adams, second President of the United States (1797–1801) | 70034029000000000004,029 | 7002424000000000000424 sq mi (70031098000000000001,098 km2) |
|
| Allamakee County | 005 | Waukon | 11 | 01847-02-20February 20, 1847 | Clayton County | Disputed, possibly named for Allan Makee, an early Indian trader and guide for early settlers | 700414330000000000014,330 | 7002640000000000000640 sq mi (70031658000000000001,658 km2) |
|
| Appanoose County | 007 | Centerville | 96 | 01843-02-17February 17, 1843 | Davis County | Appanoose, Native American chief who headed peace party in the Black Hawk War | 700412884000000000012,884 | 7002496000000000000496 sq mi (70031285000000000001,285 km2) |
|
| Audubon County | 009 | Audubon | 57 | 01851-01-15January 15, 1851 | Black Hawk County and Cass County | John James Audubon (1785–1851), ornithologist and artist | 70036119000000000006,119 | 7002443000000000000443 sq mi (70031147000000000001,147 km2) |
|
| Benton County | 011 | Vinton | 51 | 01837-12-21December 21, 1837 | Native American lands and Wisconsin Territory | Thomas Hart Benton, United States Senator (1821–1851) | 700426076000000000026,076 | 7002716000000000000716 sq mi (70031854000000000001,854 km2) |
|
| Black Hawk County | 013 | Waterloo | 39 | 01843-02-17February 17, 1843 | Delaware County | Black Hawk (1767–1838), chief of Fox and Sac Indians and leader in the Black Hawk War | 7005131090000000000131,090 | 7002567000000000000567 sq mi (70031469000000000001,469 km2) |
|
| Boone County | 015 | Boone | 47 | 01846-01-13January 13, 1846 | Polk County | Nathan Boone (1781–1863), one of the first to survey Iowa | 700426306000000000026,306 | 7002572000000000000572 sq mi (70031481000000000001,481 km2) |
|
| Bremer County | 017 | Waverly | 30 | 01851-01-15January 15, 1851 | Native American lands and Winnebago County | Fredrika Bremer (1801–1865), Swedish poet and author | 700424276000000000024,276 | 7002428000000000000428 sq mi (70031109000000000001,109 km2) |
|
| Buchanan County | 019 | Independence | 40 | 01837-12-21December 21, 1837 | Delaware County and Wisconsin Territory | James Buchanan, fifteenth President of the United States (1857–1861) | 700420958000000000020,958 | 7002571000000000000571 sq mi (70031479000000000001,479 km2) |
|
| Buena Vista County | 021 | Storm Lake | 24 | 01851-01-15January 15, 1851 | Clay County and Sac County | Battle of Buena Vista, a battle during the Mexican-American War | 700420260000000000020,260 | 7002575000000000000575 sq mi (70031489000000000001,489 km2) |
|
| Butler County | 023 | Allison | 29 | 01851-01-15January 15, 1851 | Black Hawk County and Buchanan County | William Orlando Butler (1791–1880), War of 1812 hero and unsuccessful candidate for Vice President | 700414867000000000014,867 | 7002580000000000000580 sq mi (70031502000000000001,502 km2) |
|
| Calhoun County | 025 | Rockwell City | 34 | 01851-01-15January 15, 1851 | Fox County (renamed) | John Caldwell Calhoun, Vice President of the United States (1825–1832) | 70039670000000000009,670 | 7002570000000000000570 sq mi (70031476000000000001,476 km2) |
|
| Carroll County | 027 | Carroll | 45 | 01851-01-15January 15, 1851 | Guthrie County | Charles Carroll (1737–1832), longest lived signatory of the Declaration of Independence | 700420816000000000020,816 | 7002569000000000000569 sq mi (70031474000000000001,474 km2) |
|
| Cass County | 029 | Atlantic | 68 | 01851-01-15January 15, 1851 | Pottawattamie County | Lewis Cass, United States Senator from Michigan and unsuccessful candidate for President (1848) | 700413956000000000013,956 | 7002564000000000000564 sq mi (70031461000000000001,461 km2) |
|
| Cedar County | 031 | Tipton | 65 | 01837-12-21December 21, 1837 | Wisconsin Territory | Red Cedar River, river which runs through county | 700418499000000000018,499 | 7002580000000000000580 sq mi (70031502000000000001,502 km2) |
|
| Cerro Gordo County | 033 | Mason City | 17 | 01851-01-15January 15, 1851 | Floyd County | Battle of Cerro Gordo, battle during the Mexican-American War | 700444151000000000044,151 | 7002568000000000000568 sq mi (70031471000000000001,471 km2) |
|
| Cherokee County | 035 | Cherokee | 23 | 01851-01-15January 15, 1851 | Crawford County | Cherokee Native American tribe | 700412072000000000012,072 | 7002577000000000000577 sq mi (70031494000000000001,494 km2) |
|
| Chickasaw County | 037 | New Hampton | 19 | 01851-01-15January 15, 1851 | Fayette County | Chickasaw Native American tribe | 700412439000000000012,439 | 7002505000000000000505 sq mi (70031308000000000001,308 km2) |
|
| Clarke County | 039 | Osceola | 83 | 01846-01-13January 13, 1846 | Lucas County | James Clarke, third Governor of Iowa Territory (1845–1846) | 70039286000000000009,286 | 7002431000000000000431 sq mi (70031116000000000001,116 km2) |
|
| Clay County | 041 | Spencer | 14 | 01851-01-15January 15, 1851 | Native American lands | Henry Clay, Jr. (1807–1847), officer in the Mexican-American War | 700416667000000000016,667 | 7002569000000000000569 sq mi (70031474000000000001,474 km2) |
|
| Clayton County | 043 | Elkader | 21 | 01837-12-21December 21, 1837 | Dubuque County and Wisconsin Territory | John M. Clayton (1796–1856), United States Senator from Delaware | 700418129000000000018,129 | 7002779000000000000779 sq mi (70032018000000000002,018 km2) |
|
| Clinton County | 045 | Clinton | 66 | 01837-12-21December 21, 1837 | Dubuque County and Wisconsin Territory | DeWitt Clinton (1769–1828), Governor of New York | 700449116000000000049,116 | 7002695000000000000695 sq mi (70031800000000000001,800 km2) |
|
| Crawford County | 047 | Denison | 44 | 01851-01-15January 15, 1851 | Shelby County | William Harris Crawford (1772–1834), United States Senator from Georgia | 700417096000000000017,096 | 7002714000000000000714 sq mi (70031849000000000001,849 km2) |
|
| Dallas County | 049 | Adel | 59 | 01846-01-13January 13, 1846 | Polk County | George Mifflin Dallas (1792–1864), eleventh Vice President of the United States | 700466135000000000066,135 | 7002586000000000000586 sq mi (70031518000000000001,518 km2) |
|
| Davis County | 051 | Bloomfield | 97 | 01843-02-17February 17, 1843 | Van Buren County | Garrett Davis (1801–1872), congressman | 70038753000000000008,753 | 7002503000000000000503 sq mi (70031303000000000001,303 km2) |
|
| Decatur County | 053 | Leon | 94 | 01846-01-13January 13, 1846 | Appanoose County | Stephen Decatur (1779–1820), naval officer in the War of 1812 | 70038457000000000008,457 | 7002532000000000000532 sq mi (70031378000000000001,378 km2) |
|
| Delaware County | 055 | Manchester | 41 | 01837-12-21December 21, 1837 | Dubuque County and Wisconsin Territory | State of Delaware, home of Iowa statehood advocate U.S. Senator John M. Clayton | 700417764000000000017,764 | 7002578000000000000578 sq mi (70031497000000000001,497 km2) |
|
| Des Moines County | 057 | Burlington | 89 | 01834-09-06September 6, 1834 | Michigan Territory and Wisconsin Territory | Des Moines River, river that once ran through the county | 700440325000000000040,325 | 7002416000000000000416 sq mi (70031077000000000001,077 km2) |
|
| Dickinson County | 059 | Spirit Lake | 3 | 01851-01-15January 15, 1851 | Kossuth County | Daniel Stevens Dickinson (1800–1866), United States Senator from New York | 700416667000000000016,667 | 7002381000000000000381 sq mi (7002987000000000000987 km2) |
|
| Dubuque County | 061 | Dubuque | 42 | 01834-09-06September 6, 1834 | Michigan Territory and Wisconsin Territory | Julien Dubuque (1762–1810), first permanent white settler in Iowa | 700493653000000000093,653 | 7002608000000000000608 sq mi (70031575000000000001,575 km2) |
|
| Emmet County | 063 | Estherville | 4 | 01851-01-15January 15, 1851 | Dickinson County and Kossuth County | Robert Emmet (1778–1803), Irish revolutionary and American republican sympathizer | 700410302000000000010,302 | 7002396000000000000396 sq mi (70031026000000000001,026 km2) |
|
| Fayette County | 065 | West Union | 20 | 01837-12-21December 21, 1837 | Clayton County and Wisconsin Territory | Marquis de Lafayette (1757–1834), Frenchman who aided colonial forces during the American Revolutionary War | 700420880000000000020,880 | 7002731000000000000731 sq mi (70031893000000000001,893 km2) |
|
| Floyd County | 067 | Charles City | 18 | 01851-01-15January 15, 1851 | Chickasaw County | Charles Floyd (1782–1804), member of the Lewis and Clark Expedition who died in Iowa | 700416303000000000016,303 | 7002501000000000000501 sq mi (70031298000000000001,298 km2) |
|
| Franklin County | 069 | Hampton | 28 | 01851-01-15January 15, 1851 | Chickasaw County | Benjamin Franklin (1706–1790), statesman and U.S. founding father | 700410680000000000010,680 | 7002582000000000000582 sq mi (70031507000000000001,507 km2) |
|
| Fremont County | 071 | Sidney | 90 | 01847-02-24February 24, 1847 | Pottawattamie County | John Charles Fremont (1813–1890), officer in Mexican-American War | 70037441000000000007,441 | 7002511000000000000511 sq mi (70031323000000000001,323 km2) |
|
| Greene County | 073 | Jefferson | 46 | 01851-01-15January 15, 1851 | Dallas County | Nathanael Greene (1742–1786), American Revolutionary War general | 70039336000000000009,336 | 7002568000000000000568 sq mi (70031471000000000001,471 km2) |
|
| Grundy County | 075 | Grundy Center | 38 | 01851-01-15January 15, 1851 | Black Hawk County | Felix Grundy (1777–1840), United States Senator | 700412453000000000012,453 | 7002503000000000000503 sq mi (70031303000000000001,303 km2) |
|
| Guthrie County | 077 | Guthrie Center | 58 | 01851-07-08July 8, 1851 | Jackson County | Edwin B. Guthrie, officer in Mexican-American War | 700410954000000000010,954 | 7002591000000000000591 sq mi (70031531000000000001,531 km2) |
|
| Hamilton County | 079 | Webster City | 36 | 01856-12-22December 22, 1856 | Webster County | William W. Hamilton, President of the Iowa Senate (1856–1857) | 700415673000000000015,673 | 7002577000000000000577 sq mi (70031494000000000001,494 km2) |
|
| Hancock County | 081 | Garner | 16 | 01851-01-15January 15, 1851 | Wright County | John Hancock (1737–1793), President of the First Continental Congress | 700411341000000000011,341 | 7002571000000000000571 sq mi (70031479000000000001,479 km2) |
|
| Hardin County | 083 | Eldora | 37 | 01851-01-15January 15, 1851 | Black Hawk County | John J. Hardin (1810–1847), prominent soldier in the Black Hawk War | 700417534000000000017,534 | 7002569000000000000569 sq mi (70031474000000000001,474 km2) |
|
| Harrison County | 085 | Logan | 55 | 01851-01-15January 15, 1851 | Pottawattamie County | William Henry Harrison (1773–1841), ninth President of the United States | 700414928000000000014,928 | 7002697000000000000697 sq mi (70031805000000000001,805 km2) |
|
| Henry County | 087 | Mount Pleasant | 88 | 01836-12-07December 7, 1836 | Wisconsin Territory | Disputed; either Henry Dodge (1782–1867), governor of Wisconsin Territory; or James Dougherty Henry, general in the Black Hawk War | 700420145000000000020,145 | 7002434000000000000434 sq mi (70031124000000000001,124 km2) |
|
| Howard County | 089 | Cresco | 9 | 01851-01-15January 15, 1851 | Chickasaw County | Tilghman Ashurst Howard (1797–1844), congressman | 70039566000000000009,566 | 7002473000000000000473 sq mi (70031225000000000001,225 km2) |
|
| Humboldt County | 091 | Dakota City | 26 | 01857-02-26February 26, 1857 | Webster County | Alexander von Humboldt (1769–1859), German scientist | 70039815000000000009,815 | 7002434000000000000434 sq mi (70031124000000000001,124 km2) |
|
| Ida County | 093 | Ida Grove | 32 | 01851-01-15January 15, 1851 | Cherokee County | Mount Ida in Greece | 70037089000000000007,089 | 7002432000000000000432 sq mi (70031119000000000001,119 km2) |
|
| Iowa County | 095 | Marengo | 63 | 01843-02-17February 17, 1843 | Washington County | Iowa River, river that flows through the county, and which is itself named for the Ioway Native American tribe | 700416355000000000016,355 | 7002586000000000000586 sq mi (70031518000000000001,518 km2) |
|
| Jackson County | 097 | Maquoketa | 54 | 01837-12-21December 21, 1837 | Wisconsin Territory | Andrew Jackson (1767–1845), seventh President of the United States | 700419848000000000019,848 | 7002636000000000000636 sq mi (70031647000000000001,647 km2) |
|
| Jasper County | 099 | Newton | 61 | 01846-01-13January 13, 1846 | Mahaska County | William Jasper (1750–1779), sergeant in the American Revolutionary War | 700436842000000000036,842 | 7002730000000000000730 sq mi (70031891000000000001,891 km2) |
|
| Jefferson County | 101 | Fairfield | 87 | 01839-01-21January 21, 1839 | Native American lands | Thomas Jefferson (1743–1826), third President of the United States | 700416843000000000016,843 | 7002435000000000000435 sq mi (70031127000000000001,127 km2) |
|
| Johnson County | 103 | Iowa City | 64 | 01837-12-21December 21, 1837 | Des Moines County, Iowa and Wisconsin Territory | Richard Mentor Johnson (1780–1850), Vice President of the United States 1837-1841 | 7005130882000000000130,882 | 7002614000000000000614 sq mi (70031590000000000001,590 km2) |
|
| Jones County | 105 | Anamosa | 53 | 01837-12-21December 21, 1837 | Wisconsin Territory | George Wallace Jones (1804–1896), United States Senator from Iowa | 700420638000000000020,638 | 7002575000000000000575 sq mi (70031489000000000001,489 km2) |
|
| Keokuk County | 107 | Sigourney | 74 | 01837-12-21December 21, 1837 | Washington County | Keokuk (1767–1848), chief of the Sac Native American tribe | 700410511000000000010,511 | 7002579000000000000579 sq mi (70031500000000000001,500 km2) |
|
| Kossuth County | 109 | Algona | 5 | 01851-01-15January 15, 1851 | Webster County | Lajos Kossuth (1802–1894), Hungarian revolutionary who was inspired by American democratic ideals | 700415543000000000015,543 | 7002973000000000000973 sq mi (70032520000000000002,520 km2) |
|
| Lee County | 111 | Fort Madison and Keokuk | 99 | 01836-12-07December 7, 1836 | Des Moines County | William Elliott Lee, businessman from the New York Land Company, which sold the county's first tracts of land | 700435862000000000035,862 | 7002517000000000000517 sq mi (70031339000000000001,339 km2) |
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| Linn County | 113 | Cedar Rapids | 52 | 01837-12-21December 21, 1837 | Wisconsin Territory | Lewis Fields Linn (1795–1843), doctor and United States Senator from Missouri | 7005211226000000000211,226 | 7002718000000000000718 sq mi (70031860000000000001,860 km2) |
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| Louisa County | 115 | Wapello | 76 | 01836-12-07December 7, 1836 | Des Moines County | Disputed; either Louisa Massey, a woman then famous for avenging the death of her brother; or Louisa County, Virginia | 700411387000000000011,387 | 7002402000000000000402 sq mi (70031041000000000001,041 km2) |
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| Lucas County | 117 | Chariton | 84 | 01846-01-13January 13, 1846 | Monroe County | Robert Lucas (1781–1853), first Governor of Iowa Territory | 70038898000000000008,898 | 7002431000000000000431 sq mi (70031116000000000001,116 km2) |
|
| Lyon County | 119 | Rock Rapids | 1 | 01851-01-15January 15, 1851 | Woodbury County, Iowa | Nathaniel Lyon (1818–1861), first Union general to be killed in the American Civil War, (formerly named Buncombe County) | 700411581000000000011,581 | 7002588000000000000588 sq mi (70031523000000000001,523 km2) |
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| Madison County | 121 | Winterset | 70 | 01846-01-13January 13, 1846 | Polk County | James Madison (1751–1836), fourth President of the United States | 700415679000000000015,679 | 7002561000000000000561 sq mi (70031453000000000001,453 km2) |
|
| Mahaska County | 123 | Oskaloosa | 73 | 01843-02-17February 17, 1843 | Fox and Sac Indian lands | Mahaska (1784–1834), chief of the Ioway Native American tribe | 700422381000000000022,381 | 7002571000000000000571 sq mi (70031479000000000001,479 km2) |
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| Marion County | 125 | Knoxville | 72 | 01845-06-10June 10, 1845 | Washington County | Francis Marion (1732–1795), general in the American Revolutionary War | 700433309000000000033,309 | 7002554000000000000554 sq mi (70031435000000000001,435 km2) |
|
| Marshall County | 127 | Marshalltown | 49 | 01846-01-13January 13, 1846 | Jasper County | John Marshall (1755–1835), fourth Chief Justice of the United States Supreme Court | 700440648000000000040,648 | 7002572000000000000572 sq mi (70031481000000000001,481 km2) |
|
| Mills County | 129 | Glenwood | 79 | 01851-01-15January 15, 1851 | Pottawattamie County | Frederick Mills, major killed during the Battle of Churubusco in the Mexican-American War | 700415059000000000015,059 | 7002437000000000000437 sq mi (70031132000000000001,132 km2) |
|
| Mitchell County | 131 | Osage | 8 | 01851-01-15January 15, 1851 | Chickasaw County | John Mitchel (1815–1875), Irish revolutionary who for a time operated out of the United States | 700410776000000000010,776 | 7002469000000000000469 sq mi (70031215000000000001,215 km2) |
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| Monona County | 133 | Onawa | 43 | 01851-01-15January 15, 1851 | Harrison County | Word of Native American origin that perhaps translates to "peaceful valley" | 70039243000000000009,243 | 7002693000000000000693 sq mi (70031795000000000001,795 km2) |
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| Monroe County | 135 | Albia | 85 | 01843-02-17February 17, 1843 | Wapello County | James Monroe (1758–1831), fifth President of the United States | 70037970000000000007,970 | 7002433000000000000433 sq mi (70031121000000000001,121 km2) |
|
| Montgomery County | 137 | Red Oak | 80 | 01851-01-15January 15, 1851 | Polk County | Richard Montgomery (1738–1775), general in the American Revolutionary War | 700410740000000000010,740 | 7002424000000000000424 sq mi (70031098000000000001,098 km2) |
|
| Muscatine County | 139 | Muscatine | 77 | 01836-12-07December 7, 1836 | Des Moines County | Muscatine Native American tribe | 700442745000000000042,745 | 7002439000000000000439 sq mi (70031137000000000001,137 km2) |
|
| O'Brien County | 141 | Primghar | 13 | 01851-01-15January 15, 1851 | Cherokee County | William Smith O'Brien (1803–1864), Irish revolutionary who was inspired by American democratic ideals | 700414398000000000014,398 | 7002573000000000000573 sq mi (70031484000000000001,484 km2) |
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| Osceola County | 143 | Sibley | 2 | 01851-01-15January 15, 1851 | Woodbury County | Osceola (1804–1838), Native American leader | 70036462000000000006,462 | 7002399000000000000399 sq mi (70031033000000000001,033 km2) |
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| Page County | 145 | Clarinda | 91 | 01847-02-24February 24, 1847 | Pottawattamie County | John Page, officer killed in Battle of Palo Alto in the Mexican-American War | 700415932000000000015,932 | 7002535000000000000535 sq mi (70031386000000000001,386 km2) |
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| Palo Alto County | 147 | Emmetsburg | 15 | 01851-01-15January 15, 1851 | Kossuth County | Battle of Palo Alto in the Mexican-American War | 70039421000000000009,421 | 7002564000000000000564 sq mi (70031461000000000001,461 km2) |
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| Plymouth County | 149 | Le Mars | 22 | 01851-01-15January 15, 1851 | Woodbury County | Landing place of the Pilgrims who came to America on the Mayflower | 700424986000000000024,986 | 7002864000000000000864 sq mi (70032238000000000002,238 km2) |
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| Pocahontas County | 151 | Pocahontas | 25 | 01851-01-15January 15, 1851 | Greene County and Humboldt County | Pocahantas (1595–1618), famous Native American woman | 70037310000000000007,310 | 7002578000000000000578 sq mi (70031497000000000001,497 km2) |
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| Polk County | 153 | Des Moines | 60 | 01846-01-13January 13, 1846 | Native American lands | James K. Polk (1795–1849), eleventh President of the United States | 7005430640000000000430,640 | 7002570000000000000570 sq mi (70031476000000000001,476 km2) |
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| Pottawattamie County | 155 | Council Bluffs | 67 | 01847-02-24February 24, 1847 | Native American lands | Pottawattamie Native American tribe | 700493158000000000093,158 | 7002954000000000000954 sq mi (70032471000000000002,471 km2) |
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| Poweshiek County | 157 | Montezuma | 62 | 01843-02-17February 17, 1843 | Mesquakie Indian lands | Poweshiek, chief of the Fox tribe | 700418914000000000018,914 | 7002585000000000000585 sq mi (70031515000000000001,515 km2) |
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| Ringgold County | 159 | Mount Ayr | 93 | 01847-02-24February 24, 1847 | Taylor County | Samuel Ringgold (1796–1846), major killed in the Mexican-American War | 70035131000000000005,131 | 7002538000000000000538 sq mi (70031393000000000001,393 km2) |
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| Sac County | 161 | Sac City | 33 | 01851-01-15January 15, 1851 | Greene County | Sac Native American tribe | 700410350000000000010,350 | 7002576000000000000576 sq mi (70031492000000000001,492 km2) |
|
| Scott County | 163 | Davenport | 78 | 01837-12-21December 21, 1837 | Wisconsin Territory | Winfield Scott (1786–1866), U.S. Army General during the War of 1812 | 7005165224000000000165,224 | 7002458000000000000458 sq mi (70031186000000000001,186 km2) |
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| Shelby County | 165 | Harlan | 56 | 01851-01-15January 15, 1851 | Cass County | Isaac Shelby (1750–1826), general in the American Revolutionary War and the War of 1812 | 700412167000000000012,167 | 7002591000000000000591 sq mi (70031531000000000001,531 km2) |
|
| Sioux County | 167 | Orange City | 12 | 01851-01-15January 15, 1851 | Plymouth County | Sioux Native American tribe | 700433704000000000033,704 | 7002768000000000000768 sq mi (70031989000000000001,989 km2) |
|
| Story County | 169 | Nevada | 48 | 01846-01-13January 13, 1846 | Boone County, Jasper County, and Polk County | Joseph Story (1779–1845), United States Supreme Court justice | 700489542000000000089,542 | 7002573000000000000573 sq mi (70031484000000000001,484 km2) |
|
| Tama County | 171 | Toledo | 50 | 01843-02-17February 17, 1843 | Benton County and Boone County | Disputed; either Taimah, Fox chief; or Taomah, wife of Poweshiek | 700417767000000000017,767 | 7002721000000000000721 sq mi (70031867000000000001,867 km2) |
|
| Taylor County | 173 | Bedford | 92 | 01847-02-24February 24, 1847 | Page County | Zachary Taylor (1784–1850), twelfth President of the United States | 70036317000000000006,317 | 7002534000000000000534 sq mi (70031383000000000001,383 km2) |
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| Union County | 175 | Creston | 82 | 01851-01-15January 15, 1851 | Clarke County | The union of the states | 700412534000000000012,534 | 7002424000000000000424 sq mi (70031098000000000001,098 km2) |
|
| Van Buren County | 177 | Keosauqua | 98 | 01836-12-07December 7, 1836 | Des Moines County | Martin Van Buren (1782–1862), eighth President of the United States | 70037570000000000007,570 | 7002485000000000000485 sq mi (70031256000000000001,256 km2) |
|
| Wapello County | 179 | Ottumwa | 86 | 01843-02-17February 17, 1843 | Native American lands | Wapello, chief of the Fox Native American tribe | 700435625000000000035,625 | 7002432000000000000432 sq mi (70031119000000000001,119 km2) |
|
| Warren County | 181 | Indianola | 71 | 01846-01-13January 13, 1846 | Polk County | Joseph Warren (1741–1775), General in the American Revolutionary War | 700446225000000000046,225 | 7002572000000000000572 sq mi (70031481000000000001,481 km2) |
|
| Washington County | 183 | Washington | 75 | 01839-01-25January 25, 1839 | Wisconsin Territory | George Washington (1732–1799), first President of the United States | 700421704000000000021,704 | 7002569000000000000569 sq mi (70031474000000000001,474 km2) |
|
| Wayne County | 185 | Corydon | 95 | 01846-01-13January 13, 1846 | Appanoose County | Anthony Wayne (1745–1796), General in the American Revolutionary War | 70036403000000000006,403 | 7002526000000000000526 sq mi (70031362000000000001,362 km2) |
|
| Webster County | 187 | Fort Dodge | 35 | 01853-01-12January 12, 1853 | Risley County and Yell County (defunct counties) | Daniel Webster (1782–1852), U.S. Senator from Massachusetts | 700438013000000000038,013 | 7002715000000000000715 sq mi (70031852000000000001,852 km2) |
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| Winnebago County | 189 | Forest City | 6 | 01851-01-15January 15, 1851 | Kossuth County | Winnebago Native American tribe | 700410866000000000010,866 | 7002400000000000000400 sq mi (70031036000000000001,036 km2) |
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| Winneshiek County | 191 | Decorah | 10 | 01847-02-20February 20, 1847 | Native American lands | Winneshiek, chief of the Winnebago Native American tribe | 700421056000000000021,056 | 7002690000000000000690 sq mi (70031787000000000001,787 km2) |
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| Woodbury County | 193 | Sioux City | 31 | 01853-01-12January 12, 1853 | Polk County | Levi Woodbury (1789–1851), Governor of New Hampshire, (formerly named Wahkaw County) | 7005102172000000000102,172 | 7002873000000000000873 sq mi (70032261000000000002,261 km2) |
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| Worth County | 195 | Northwood | 7 | 01851-01-15January 15, 1851 | Mitchell County | William Jenkins Worth (1794–1849), officer in the Black Hawk War and the Mexican-American War | 70037598000000000007,598 | 7002400000000000000400 sq mi (70031036000000000001,036 km2) |
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| Wright County | 197 | Clarion | 27 | 01851-01-15January 15, 1851 | Webster County and Kossuth County | Silas Wright (1795–1847), Governor of New York, and Joseph Albert Wright (1810–1867), Governor of Indiana, brothers | 700413229000000000013,229 | 7002581000000000000581 sq mi (70031505000000000001,505 km2) |
Read more about this topic: List Of Counties In Iowa
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