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Iowa County Creation Dates and Parent Counties

Note
 See an interactive outline map of Iowa Historical Counties at Newberry Library site.[1] Select a year and the map will display the historical county boundaries. Click on map image for county details.


Tip: Sort the table by Date Formed or by Parent Counties and check Boundary Changes for interesting insights.
Name of County Date Formed Boundary
Changes 		Parent County Counties Created by Boundary Changes
Adair 1851 Jan 15 Details Cass none
Adams 1851 Jan 15 Details Taylor none
Allamakee 1847 Details Clayton none
Appanoose 1843 Feb 17 Details Davis Decatur 1846
Audubon 1851 Jan 15 Details Cass, Black Hawk none
Bancroft 1851 Jan 15 Details Kossuth declared unconstitutional 1871
Belknap 1874 Details Pottawattamie rejected by voters 1876
Benton 1837 Dec 21 Details old Dubuque Ida 1851, Kossuth 1851, Marshall 1846, Sac 1851, Story 1846, Tama 1843
Black Hawk 1846 Jun 05 Details Delaware Audubon 1851, Butler 1851, Grundy 1851, Hardin 1851
Boone 1846 Jun 05 Details Polk none
Bremer 1851 Jan 15 Details Winnebago Indian reserve none
Buchanan 1837 Dec 21 Details old Dubuque Butler 1851, Pocahontas 1851, Ida 1851, Plymouth 1851, Sac 1851, Wright 1851
Buncombe 1851 Jan 15 Details Woodbury, Webster renamed Lyon 1862
Buena Vista 1851 Jan 15 Details Sac, Clay none
Butler 1851 Jan 15 Details Buchanan, Black Hawk none
Calhoun 1853 Jan 22 Details renamed from Fox none
Carroll 1851 Jan 15 Details Gutherie none
Cass 1851 Jan 15 Details Pottawattamie Adair 1851, Audubon 1851
Cedar 1837 Dec 21 Details old Dubuque none
Cerro Gordo 1851 Jan 15 Details Floyd none
Cherokee 1851 Jan 15 Details Crawford none
Chickasaw 1851 Jan 15 Details Fayette Franklin 1851
Clarke 1851 Jan 15 Details Lucas none
Clay 1851 Jan 15 Details Indian lands Buena Vista 1851
Clayton 1837 Dec 21 Details old Dubuque Allamakee 1847, Fayette 1837
Clinton 1837 Dec 21 Details old Dubuque none
Cook 1836 Dec 07 Details Demoine extinct 1837
Crawford 1851 Jan 15 Details Shelby Cherokee 1851
Crocker 1870 Details Bancroft, Kossuth declared unconstitutional 1871
Dallas 1846 Jan 17 Details Polk Greene 1851
Davis 1843 Feb 17 Details Van Buren Appanoose 1843
Decatur 1846 Jan 17 Details Appanoose none
Delaware 1837 Dec 21 Details old Dubuque Black Hawk 1843
Demoine 1833 Jun 01 Details Wisconsin Territory Des Moines 1836, Lee 1836, Henry 1836, Van Buren 1836, Louisa 1836, Cook 1836, Muscatine 1836
Des Moines 1836 Dec 07 Details Demoine Story 1846, Taylor 1847, Union 1851, Madison 1844, Mahaska 1843,Marion 1845, Page 1847, Warren 1846, Wayne 1846
Dickinson 1851 Jan 15 Details Kossuth Emmet 1851
Dubuque (old) 1834 Sep 06 Details Wisconsin Territory Dubuque 1837, Clayton 1837,Jackson 1837, benton 1837, Linn 1837,Jones 1837, Clinton 1837, Johnson 1837, Scott 1837, Delaware 1837, Buchanan 1837, cedar 1837, Fayette 1837
Dubuque 1837 Dec 21 Details old Dubuque none
Emmet 1851 Jan 15 Details Kossuth, Dickinson none
Fayette 1837 Dec 21 Details old Dubuque Story 1846, Sioux 1851, Palo Alto 1851, Plymouth 1851,Tama 1843, Chickasaw 1851, Howard 1851, Osceola 1851, Pocahontas 1851, Mitchell 1851, O’Brien 1851, Winnebago 1847, Wright 1851, Winneshiek 1847, Worth 1851
Floyd 1851 Jan 15 Details Chickasaw Cerro Gordo 1851
Fox 1851 Jan 15 Details Pottawattamie renamed Calhoun 1853
Franklin 1851 Jan 15 Details Chickasaw none
Fremont 1847 Details Pottawattamie none
Greene 1851 Jan 15 Details Dallas none
Grimes 1876 Details Pottawattamie rejected by voters 1876
Grundy 1851 Jan 15 Details Black Hawk none
Guthrie 1851 Jan 15 Details Jackson, Iowa Carroll 1851
Hamilton 1856 Details Webster none
Hancock 1851 Jan 15 Details Wright none
Hardin 1851 Jan 15 Details Black Hawk none
Harrison 1851 Jan 15 Details Pottawattamie none
Henry 1836 Dec 07 Details Demoine Washington 1837
Howard 1851 Jan 15 Details Fayette none
Humbolt (old) 1851 Jan 15 Details Fayette extinct
Humboldt 1857 Feb 26 Details Webster none
Ida 1851 Jan 15 Details Buchanan, Benton none
Iowa 1843 Feb 17 Details Washington Guthrie 1851
Jackson 1837 Dec 21 Details old Dubuque Guthrie 1851
Jasper 1846 Jan 17 Details Mahaska none
Jefferson 1839 Nov 04 Details Indian lands none
Johnson 1837 Dec 21 Details old Dubuque none
Jones 1837 Dec 21 Details old Dubuque none
Keokuk (old) 1837 Oct 21 Details Sac and Fox Indian lands Keokuk 1843, Mahaska 1843
Keokuk 1837 Feb 17 Details old Keokuk Poweshiek 1848, Marion 1845, Jasper 1846, Shelby 1846, Story 1846, Warren 1846
Kishkekosh 1843 Feb 17 Details Wapello renamed Monroe 1846
Kossuth 1851 Jan 15 Details Fayette, Bancroft Dickinson 1851, Emmet 1851
Lee 1836 Dec 07 Details Demoine none
Linn 1837 Dec 21 Details old Dubuque none
Louisa 1836 Dec 07 Details Demoine Washington 1837
Lucas 1846 Jun 05 Details Monroe Clark 1851
Lyon 1862 Sep 11 Details renamed from Buncombe none
Madison 1844 Jun 16 Details Des Moines none
Mahaska 1843 Feb 17 Details Des Moines, Keokuk Jasper 1846
Marion 1845 May 05 Details Des Moines, Keokuk none
Marshall 1846 Jun 05 Details Benton none
Mills 1851 Jan 15 Details Pottawattamie none
Mitchell 1851 Jan 15 Details Fayette none
Monona 1853 18 De Details Harrison none
Monroe 1846 Jan 19 Details renamed from Kishkekosh Lucas 1846
Montgomery 1851 Jan 15 Details Polk none
Muscatine 1836 Dec 07 Details Demoine Washington 1837
O’Brien 1851 Jan 15 Details Fayette none
Osceola 1851 Jan 15 Details Fayette none
Page 1847 Details Des Moines none
Palo Alto 1851 Jan 15 Details Fayette none
Plymouth 1851 Jan 15 Details Buchanan, Fayette none
Pocahontas 1851 Jan 15 Details Buchanan, Fayette none
Polk 1846 Jun 05 Details Indian lands Boone 1846, Montgomery 1851, Dallas 1846
Pottawattamie 1846 Jun 05 Details Pottawattamie Indian lands Cass 1851, Fremont 1847, harrison 1851, Jasper 1841, Taylor 1847, Union 1851
Poweshiek 1848 Apr Details Keokuk none
Ringgold 1854 Aug Details Taylor none
Risley 1851 Jan 15 Details Hamilton renamed 1853
Sac 1851 Jan 15 Details Buchanan, Benton Buena Vista 1851
Scott 1837 Dec 21 Details old Dubuque none
Shelby 1851 Jan 15 Details Keokuk Crawford 1851
Sioux 1851 Jan 15 Details Fayette none
Slaughter 1837 Dec 21 Details Louisa, Muscatine, Henry renamed Washington 1839
Story 1846 Jun 05 Details Benton none
Tama 1843 Feb 17 Details Benton none
Taylor 1847 Details Des Moines, Pottawattamie Adams 1851, Taylor 1847
Union 1851 Jan 15 Details Des Moines, Pottawattamie none
Van Buren 1836 Dec 07 Details Demoine Davis 1843
Wapello 1844 Jun 16 Details Indian lands none
Wahkaw 1851 Jan 15 Details Benton, Buchanan renamed Woodbury 1853
Warren 1846 Jun 05 Details Des Moines, Keokuk none
Washington 1839 Jan 25 Details renamed from Slaughter none
Wayne 1846 Jun 05 Details Des Moines none
Webster 1853 Jan 12 Details renamed from Risley Hamilton 1856, Humbolt 1857, Buncombe 1851
Winnebago 1851 Jan 15 Details Fayette none
Winneshiek 1847 Details Fayette none
Woodbury 1853 Jan 12 Details renamed from Wahkaw none
Worth 1851 Jan 15 Details Fayette none
Wright 1851 Jan 15 Details Buchanan, Fayette Hancock 1851
Yell 1851 Jan 15 Details Indian lands extinct 1853, absorbed by Webster 1853 by voters
  1. ↑ Iowa Atlas of Historical County Boundaries, John H. Long, Editor; Peggy Tuck Sinko, Associate Editor; Gordon DenBoer, Historical Compiler; Douglas Knox, Book Digitizing Director and Digital Compiler; Emily Kelley, Research Associate; Laura Rico-Beck, GIS Specialist; Peter Siczewicz, ArcIMS Interactive Map Designer; Robert Will, Cartographic Assistant. Copyright The Newberry Library 2008.
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