- Adair - 15 Jan 1851 from Cass.
| A-Z | 462 records, counting |updated 14 Nov 2012
- Adams - 15 Jan 1851 from Taylor.
| A-Z | 648 records |updated 2 Dec 2012
- Allamakee - 1847 from Clayton.
| A-I | J-Z | 1685 records
- Appanoose - 17 Feb 1843 from Davis. Part taken for Decatur 1846.
- Audubon - 15 Jan 1851 from Cass & Black Hawk.
- Benton - 21 Dec 1837 from Dubuque. Parts taken for Ida 1851, Kossuth 1851, Marshall 1846, Sac 1851, Story 1846, Tama 1843.
- Black Hawk - 5 June 1846 from Delaware. Parts taken for Audubon 1851, Butler, 1851, Grundy 1851, Hardin 1851.
- Boone - 5 June 1846 from Polk.
- Bremer - 15 Jan 1851 from Winnebago, Indian Reserve.
- Buchanan - 21 Dec 1837 from Dubuque. Parts taken fro Butler 1851, Pocahontas 1851, Ida 1851, Plymouth 1851, Sac 1851, Wright 1851.
- Buena Vista - 15 Jan 1851 from Sac & Clay.
- Butler - 15 Jan 1851 from Buchanan & Black Hawk.
- Calhoun - 22 Jan 1853 from Fox.
- Carroll - 15 Jan 1851 from Gutherie as Fox. Renamed 22 Jan 1853.
- Cass - 15 Jan 1851 from Pottawattamie. Parts taken for Adair 1851, Audubon 1851.
- Cedar - 21 Dec 1837 from Dubuque.
- Cerro Gordo - 15 Jan 1851 from Floyd.
- Cherokee - 15 Jan 1851 from Crawford.
- Chickasaw - 15 Jan 1851 from Fayette. Part taken for Franklin 1851.
- Clarke - 15 Jan 1851 from Lucas.
- Clay - 15 Jan 1851 from Indian lands. Part taken for Buena Vista 1851.
- Clayton - 21 Dec 1837 from Dubuque. Parts taken for Allamakee 1847, Fayette 1837.
| A-Z | in progress
| updated 23 May 2003
| 377 records, counting
- Clinton - 21 Dec 1837 from Dubuque.
- Crawford - 15 Jan 1851 from Shelby. Part taken for Cherokee, 1851
- Dallas - 17 Jan 1846 from Polk. Part takenf or Greene 1851.
- Davis - 17 Jan 1846 from Polk. Part taken for Greene 1851.
- Decatur - 17 Jan 1846 from Appanoose.
- Delaware - 21 Dec 1837 from Old Dubuque. Part taken for Black Hawk 1843
- Des Moines - 7 Dec 1836 renamed from Demoine. Parts taken for Lee 1836, Henry 1836, Van Buren 1836, Louisa 1836, Cook 1836, Muscatine 1836, Story 1846, Taylor 1847, Union 1851, Madison 1844, Mahaska 1843, Marion 1845, Page 1847, Warren 1846, Wayne 1846.
- Dickinson - 15 Jan 1851 from Kossuth. Part taken for Emmet 1851.
- Dubuque - 21 Dec 1837 from Old Dubuque
- Emmet - 15 Jan 1851 from Kossuth & Dickinson
- Fayette - 21 Dec 1837 from Old Dubuque. Parts taken for Story 1846, Sioux 1851, Palo Alto 1851, Plymouth 1851, Tama 1843, Chickasaw 1851, Howard 1851, Osclota 1851, Pocahontas 1851, Mitchell 1851, O'Brien 1851, Winnebago 1847, Wright 1851, Winneshiek 1849, Worth 1851.
- Floyd - 15 Jan 1851 from Chickasaw. Part taken for Cerro Gordo 1851.
- Franklin - 15 Jan 1851 from Chickasaw.
- Fremont - 1847 from Pottawattamie.
- Greene - 15 Jan 1851 from Dallas.
- Grundy - 15 Jan 1851 from Black Hawk.
- Guthrie - 15 Jan 1851 from Jackson. Part taken for Carroll 1851.
- Hamilton - 1856 from Webster.
- Hancock - 15 Jan 1851 from Wright.
- Hardin - 15 Jan 1851 from Black Hawk.
- Harrison - 15 Jan 1851 from Pottawattamie.
- Henry - 7 Dec1836 from Des Moines. Part taken for Washington 1837
- Howard - 15 Jan 1851 from Fayette.
- Humboldt - 26 Feb 1857 from Webster.
- Ida - 15 Jan 1851 from Buchanan & Benton.
- Iowa - 17 Feb 1843 from Washington. Part taken for Gutherie 1851.
- Jackson - 21 Dec 1837 from Dubuque. Part taken for Gutherie 1851.
- Jasper - 17 Jan 1846 from Mahaska.
- Johnson - 4 Nov 1839 from Indian lands.
- Jones - 21 Dec 1837 from Dubuque.
- Keokuk - 21 Oct 1837 from Sacs & Fox Indian lands. Parts taken for Mahaska 1843, Poweshiek 1848, Marion 1845, Jasper 1846, Shelby 1846, Story 1846, Warren 1846.
- Kossuth - 15 Jan 1851 from Fayette & Bancroft. Parts taken for Dickinson 1851, Emmet 1851.
- Lee - 7 Dec 1836 from Des Moines (Demoine).
- Linn - 21 Dec 1837 from Dubuque.
- Louisa 7 Dec 1836 from Des Moines (Demoine). Part taken for Washington 1837.
- Lucas - 5 Jun 1846 from Monroe. Part taken for Clark 1851.
- Lyon - 15 Jan 1851 from Woodbury & Webster as Buncombe. Renamed 11 Sep 1862.
- Madison - 16 June 1844 from Des Moines.
- Mahaska - 17 Feb 1843 from Des Moines & Keokuk. Part taken for Jasper 1846.
- Marion - 5 May 1845 from Des Moines & Keokuk.
- Marshall - 5 Jun 1846 from Benton.
- Mills - 15 Jan 1851 from Pottawattamie.
- Mitchell - 15 Jan 1851 from Fayette.
| A-Z | updated 12 Oct 2007 | 151 records, counting
- Monona - Dec 1853 from Harrison.
- Monroe - 17 Feb 1843 from Wapello as Kishkekosh. Renamed 19 Jan 1846. Part taken for Lucas 1846.
- Montgomery - 15 Jan 1851 from Polk.
- Muscatine - 7 Dec 1836 from Des Moines (Demoine). Part taken for Washington 1837.
- O'Brien - 15 Jan 1851 from Fayette.
- Osceola - 15 Jan 1851 from Fayette.
- Page - 1847 from Des Moines.
- Palo Alto - 15 Jan 1851 from Fayette.
- Plymouth - 15 Jan 1851 from Buchanan & Fayette.
- Pocahontas - 15 Jan 1851 from Buchanan & Fayette.
- Polk - 5 Jun 1846 from Indian Lands. Parts taken for Boone 1846, Montgomery 1851, Dallas 1846.
- Pottawattamie - 5 Jun 1846 from Pottawattamie Indian lands. Parts taken for Cass 1851, Fremont 1847, Harrison 1851, Jasper 1841, Taylor 1847, Union 1851.
| A-Z | updated 30 Nov 2009 | 350 records, counting
- Poweshiek - Aug 1848 from Keokuk.
- Ringgold - Aug 1854 from Taylor.
- Sac - 15 Jan 1851 from Buchanan & Benton. Part taken for Buena Vista 1851.
- Scott - 21 Dec 1837 from Dubuque.
- Shelby - 15 Jan 1851 from Fayette.
- Sioux - 21 Dec 1837 from Louisa, Muscatine & Henry.
- Story - 5 June 1846 from Benton.
- Tama - 17 Feb 1843 from Benton.
- Taylor - 1847 from Des Moines & Pottawattamie. Part taken for Adam 1851
- Union - 15 Jan 1851 from Des Moines & Pottawattamie.
- Van Buren - 7 Dec 1836 from Des Moines (Demoine). Part taken for Davis 1843.
- Wapello - 16 Jun 1844 from Indian lands.
- Warren - 5 Jun 1846 from Des Moines & Keokuk.
- Washington - 21 Dec 1837 from Louisa, Muscatine & Henry as Slaughter. Renamed 25 Jan 1839.
- Wayne - 5 Jun 1846 from Des Moines.
- Webster - 15 Jan 1851 from Yell & Risley. Parts taken for Hamilton 1856, Humbolt 1857, Buncombe 1851.
- Winnebago - 15 Jan 1851 from Fayette.
- Winneshiek - 1847 from Fayette.
- Woodbury - 22 Jan 1853 renamed from Wahkaw.
- Worth - 15 Jan 1851 from Indian lands.
| A-Z | updated 10 Oct 2007 | 114 records, counting
- Wright - 15 Jan 1851 from Buchanan and Fqayette. Part taken for Hancock 1851.
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