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Iowa County Formation Table

County Formation

Wisconsin Territory was organized in 1836 from land formerly belonging to Michigan Territory encompassing the area as follows: south and east by Missouri, Illinois and Lake Michigan; east and north by Michigan, Lake Superior, and the International Line; westerly by the White Earth River and the Missouri River. In 1838 Wisconsin Territory was contracted to approximately the area of the present state, and the remainder of the territory was organized as Iowa Territory. In 1846 Iowa was admitted as a state, with its present boundaries. The remainder of the territory, being the residue of the original Wisconsin Territory, was unattached until the creation of Minnesota Territory in 1849.

 

The following table summarizes the formation dates of Iowa Counties. Note that counties have a complex history that this table does not adequately represent. For more detailed information, see the individual county website or consult the Histories of Iowa Counties at the State Library of Iowa.

Name Created Created from County seat Iowa County 万家彩票app Page
Adair 1851 Cass Greenfield /adair
Adams 1851 Taylor Corning /adams
Allamakee 1847 Clayton Waukon /allamakee
Appanoose 1843 Davis Centerville /appanoose
Audubon 1851 Cass, Black Hawk Audubon /audubon
Bancroft 1851 extinct    
Benton 1837 Indian Land Purchase; Wisconsin Territory Vinton /benton
Black Hawk 1843 Delaware Waterloo /blackhawk
Boone 1846 Polk Boone /boone
Bremer 1851 Winnebago, Indian Reserve Waverly /bremer
Buchanan 1837 Delaware, Wisconsin Territory Independence /buchanan
Buncombe   changed to Lyon,1862    
Buena Vista 1851 Sac, Clay Storm Lake /buenavista
Butler 1851 Buchanan, Black Hawk Allison /butler
Calhoun 1855 formerly called Fox Rockwell City /calhoun
Carroll 1851 Guthrie Carroll /carroll
Cass 1851 Pottawattamie Atlantic /cass
Cedar 1837 Wisconsin Territory Tipton /cedar
Cerro Gordo 1851 Floyd Mason City /cerrogordo
Cherokee 1851 Crawford Cherokee /cherokee
Chickasaw 1851 Fayette New Hampton /chickasaw
Clarke 1846 Lucas Osceola /clarke
Clay 1851 Indian Lands Spencer /clay
Clayton 1837 Dubuque, Wisconsin Territory Elkader /clayton
Clinton 1837 Dubuque, Wisconsin Territory Clinton /clinton
Cook County 1836 from Demoin & Dubuque; extinct    
Crawford 1851 Shelby Denison /crawford
Dallas 1846 Polk Adel /dallas
Davis 1843 Van Buren Bloomfield /davis
Decatur 1846 Appanoose Leon /decatur
Delaware 1837 Dubuque, Wisconsin Territory Manchester /delaware
Des Moines (Originally Demoine) 1834 Michigan Territory; 1836 Wisconsin Territory Burlington /desmoines
Dickinson 1851 Kossuth Spirit Lake /dickinson
Dubuque 1834 Michigan Territory; 1836 Wisconsin Territory Dubuque /dubuque
Emmet 1851 Kossuth, Dickinson Estherville /emmet
Fayette 1837 Clayton, Wisconsin Territory West Union /fayette
Floyd 1851 Chickasaw Charles City /floyd
Fox 1851 1855, renamed Calhoun    
Franklin 1851 Chickasaw Hampton /franklin
Fremont 1847 Pottawattamie Sidney /fremont
Greene 1851 Dallas Jefferson /greene
Grundy 1851 Black Hawk Grundy Center /grundy
Guthrie 1851 Jackson Guthrie Center /guthrie
Hamilton 1856 Webster Webster City /hamilton
Hancock 1851 Wright Garner /hancock
Hardin 1851 Black Hawk Eldora /hardin
Harrison 1851 Pottawattamie Logan /harrison
Henry 1836 Wisconsin Territory Mount Pleasant /henry
Howard 1851 Chickasaw, Floyd Cresco /howard
Humboldt 1851 Webster (originally spelled Humbolt) Dakota City /humboldt
Ida 1851 Cherokee Ida Grove /ida
Iowa 1843 Washington Marengo /iowa
Jackson 1837 Wisconsin Territory Maquoketa /jackson
Jasper 1846 Mahaska Newton /jasper
Jefferson 1839 Indian Land Purchase Fairfield /jefferson
Johnson 1837 Des Moines, Wisconsin Territory Iowa City /johnson
Jones 1837 Wisconsin Territory Anamosa /jones
Keokuk 1837 Wisconsin Territory; extinct    
Keokuk 1843 Washington Sigourney /keokuk
Kishkekosh   changed to Monroe, 1846    
Kossuth 1851 Webster Algona /kossuth
Lee 1836 Des Moines Fort Madison /lee
Linn 1837 Wisconsin Territory Cedar Rapids /linn
Louisa 1836 Des Moines Wapello /louisa
Lucas 1846 Monroe Chariton /lucas
Lyon 1851 Woodbury Rock Rapids /lyon
Madison 1844 extinct    
Madison 1846 Polk Winterset /madison
Mahaska 1843 Fox, Sac Indian Purchase Oskaloosa /mahaska
Marion 1845 Washington Knoxville /marion
Marshall 1846 Jasper Marshalltown /marshall
Mills 1851 Pottawattamie Glenwood /mills
Mitchell 1851 Chickasaw Osage /mitchell
Monona 1851 Harrison Onawa /monona
Monroe 1843 Monroe (formerly Kishkekosh) Albia /monroe
Montgomery 1851 Polk Red Oak /montgomery
Muscatine 1836 Des Moines Muscatine /muscatine
O'Brien 1851 Cherokee Primghar /obrien
Osceola 1851 Woodbury Sibley /osceola
Page 1847 Pottawattamie Clarinda /page
Palo Alto 1858 Kossuth Emmetsburg /paloalto
Plymouth 1851 Woodbury Le Mars /plymouth
Pocahontas 1851 Humboldt, Greene Pocahontas /pocahontas
Polk 1846 Indian Lands Des Moines /polk
Pottawattamie 1848 Indian Lands Council Bluffs /pottawattamie
Poweshiek 1843 Mesquakie Indian Lands Montezuma /poweshiek
Ringgold 1847 Taylor Mount Ayr /ringgold
Risley 1851 changed to Webster 1853    
Sac 1851 Greene Sac City /sac
Scott 1837 Wisconsin Territory Davenport /scott
Shelby 1851 Cass Harlan /shelby
Sioux 1851 Plymouth Orange City /sioux
Slaughter 1837 Wisconsin Territory; renamed Washington, 1838    
Story 1846 Jasper, Polk, Boone Nevada /story
Tama 1843 Boone, Benton Toledo /tama
Taylor 1847 Page Bedford /taylor
Union 1851 Clarke Creston /union
Van Buren 1836 Des Moines Keosauqua /vanburen
Wahkaw 1851 changed to Woodbury, 1853    
Wapello 1843 Indian Lands Ottumwa /wapello
Warren 1846 Polk Indianola /warren
Washington 1837 Wisconsin Territory; formerly Slaughter Washington /washington
Wayne 1846 Appanoose Corydon /wayne
Webster 1851 Yell, Risley Fort Dodge /webster
Winnebago 1851 Kossuth Forest City /winnebago
Winneshiek 1847 Indian Lands Decorah /winneshiek
Woodbury 1851 Indian Lands (formerly Wahkaw) Sioux City /woodbury
Worth 1851 Mitchell Northwood /worth
Wright 1851 Webster Clarion /wright
Yell 1851 extinct    

Sources consulted include 1904 Iowa Official Register, The Handy Book for Genealogists and Histories of Iowa Counties.
Prepared by Greta Thompson, August, 2004.