Illinois County Creation Dates and Parent CountiesEdit This Page
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| Name of County | Date Formed | Parent County | Progeny County |
| Adams | 13 Jan 1825 | Pike | none |
| Alexander | 04 Mar 1819 | Johnson | none |
| Bond | 04 Jan 1817 | Madison | Clinton 1824, Fayette 1821, Pike 1821, Montgomery 1821, Sangamon 1821 |
| Boone | 04 Mar 1837 | Winnebago | none |
| Brown | 01 Feb 1839 | Schuyler | none |
| Bureau | 28 Feb 1837 | Putnam | none |
| Calhoun | 10 Jan 1825 | Pike | none |
| Cass | 03 Mar 1837 | Morgan | none |
| Champaign | 20 Feb 1833 | Vermillion | none |
| Christian | 01 Feb 1840 | renamed from Dane | none |
| Clark | 22 Mar 1819 | Crawford | Coles 1830, Edgar 1823, Ford 1859, Fayette 1821, Pike 1821 |
| Clay | 23 Dec 1824 | Lawrence, Wayne, Fayette | none |
| Clinton | 27 Dec 1824 | Washington, Bond, Fayette | none |
| Coles | 25 Dec 1830 | Clark, Edgar | Cumberland 1843, Douglas 1859 |
| Cook | 15 Jan 1831 | Putnam | DuPage 1839, McHenry 1836, Will 1836 |
| Crawford | 31 Dec 1816 | Edwards | Clark 1819, Effingham 1821, Jasper 1831, Lawrence 1821 |
| Cumberland | 02 Mar 1843 | Coles | none |
| Dane | 15 Feb 1839 | Sangamon | renamed Christian 1840 |
| DeKalb | 04 Mar 1837 | Kane | none |
| DeWitt | 01 Mar 1839 | McLean, Macon | Piatt 1841 |
| Douglas | 08 Feb 1839 | Coles | none |
| DuPage | 09 Feb1 839 | Cook | none |
| Edgar | 03 Jan 1823 | Clark | Coles 1830, Vermillion 1826 |
| Edwards | 28 Nov 1814 | Madison, Gallatin | Crawford 1816, Jefferson 1839, Lawrence 1821, Wabash 1827, Wayne 1819 |
| Effingham | 15 Feb 1831 | Fayette, Crawford | none |
| Fayette | 14 Feb 1821 | Bond, Jefferson, Wayne, Clark | Clay 1824, Clinton 1824, Effingham 1831, Marin 1833, Shelby 1827, Tazewell 1827 |
| Ford | 17 Feb 1859 | Clark | none |
| Franklin | 02 Jan 1818 | White, Gallatin | Williamson 1839 |
| Fulton | 28 Jan 1823 | Pike | Henry 1825, Knox 1825, Peoria 1825, Putnam 1825, Schuyler 1825 |
| Gallatin | 14 Sep 1812 | Randolph | Edwards 1814, Franklin 1818, Pope 1816, Saline 1847, White 1815 |
| Greene | 20 Jan 1821 | Madison | Jersey 1819, Macoupin 1829 |
| Grundy | 17 feb 1841 | La Salle | none |
| Hamilton | 08 Feb 1821 | White | none |
| Hancock | 13 Jan 1825 | Pike | none |
| Hardin | 02 Mar 1839 | Pope | none |
| Henderson | 20 Jan 1841 | Warren | none |
| Henry | 13 Jan 1825 | Fulton | Jo Daviess 1827, Whiteside 1836 |
| Iroquois | 26 Feb 1823 | Vermillion | Kankakee 1853, Will 1836 |
| Jackson | 10 Jan 1816 | Randolph, Johnson | Perry 1841 |
| Jasper | 15 Feb 1831 | Crawford, Clay | none |
| Jefferson | 28 Feb 1839 | Edwards, White | Fayette 1821, Marion 1833 |
| Jersey | 26 Mar 1819 | Greene | none |
| Jo Daviess | 27 Feb 1827 | Mercer, Henry, Putnam | Carroll 1837, Ogle 1836, Rock Island 1831, Stephenson 1837, Whtieside 1836, Winnebago 1836 |
| Johnson | 14 Sep 1812 | Randolph | Alexandr 1819, jackson 1816, Pope 1816, Massac 1843, Pulaski 1843, Union 1818 |
| Kane | 16 Jan 1836 | La Salle | DeKalb 1837, Kendall 1841 |
| Kankakee | 11 Feb 1853 | Iroquois, Will | none |
| Kendall | 19 Feb 1841 | La Salle, Kane | none |
| Knox | 13 Jan 1825 | Fulton | Stark 1839 |
| Lake | 01 Mar 1839 | Mc Henry | none |
| LaSalle | 15 Jan 1831 | Putnam, Vermillion | Grundy 1841, Kane 1836, Kendall 1841, Livingston 1837 |
| Lawrence | 16 Jan 1821 | Crawford, Edwards | Clay 1824, Richland 1841 |
| Lee | 27 Feb 1839 | Ogle | none |
| Livingston | 27 Feb 1837 | La Salle, McLean | none |
| Logan | 15 Feb 1839 | Sangamon, Tazewell | none |
| Macon | 19 Jan 1829 | Shelby | DeWitt 1839, Moultrie 1843, Pratt 1841 |
| Macoupin | 17 Jan 1829 | Madison, Greene | none |
| Madison | 14 Sep 1812 | St. Clair | Bond 1817, Edwards 1814, Green 1821, Macoupin 1829, Montgomery 1821, Pike 1821, Sangamon 1821 |
| Marion | 24 Jan 1833 | Fayette, Jefferson | none |
| Marshall | 19 Jan 1839 | Putnam | none |
| Mason | 20 Jan 1841 | Tazewell | none |
| Massac | 08 Feb 1843 | Pope, Johnson | none |
| McDonough | 25 Jan 1826 | Schuyler | none |
| McHenry | 16 Jan 1836 | Cook | Lake 1839 |
| McLean | 25 Dec 1830 | Tazewell | DeWitt 1839, Livingston 1837, Woodford 1841 |
| Menard | 15 Feb 1839 | Sanagmon | none |
| Mercer | 13 Jan 1825 | Pike | Jo Daviess 1827 |
| Monroe | 06 Jan 1816 | Randolph, St. Clair | none |
| Montgomery | 12 Feb 1821 | Bond, Madison | none |
| Morgan | 31 Jan 1823 | Sangamon | Cass 1837, Scott 1839 |
| Moultrie | 16 Feb 1843 | Shelby, Macon | none |
| Ogle | 16 Jan 1836 | Jo Daviess | Lee 1839 |
| Peoria | 13 Jan 1825 | Fulton | none |
| Perry | 29 Jan 1841 | Randolph, Jackson | none |
| Piatt | 20 Jan 1841 | DeWitt, Macon | none |
| Pike | 31 Jan 1821 | Madison, Bond, Clark | Adams 1825, Calhoun 1825, Fulton 1823, Hancock 1825, Mercer 1825, Schuyler 1825, Warren 1825 |
| Pope | 10 Jan 1816 | Johnson, Gallatin | Hardin 1839, Massac 1843 |
| Pulaski | 03 Mar 1843 | Johnson | none |
| Putnam | 13 Jan 1825 | Fulton | Bureau 1837, Cook 1831, Jo Daviess 1827, La Salle 1831, Marshall 1839, Stark 1839 |
| Randolph | 05 Oct 1795 | St. Clair | Gallatin 1812, Jackson 1816, Johnson 1812, Monroe 1816, Perry 1841, now in Indiana |
| Richland | 24 Feb 1841 | Clay, Lawrence | none |
| Rock Island | 09 Feb 1831 | Jo Daviess | none |
| St. Clair | 27 Apr 1790 | Northwest Territory | Madison 1812, Monroe 1816, Randolph 1795, Washington 1818, now in Indiana |
| Saline | 25 Feb 1847 | Gallatin | none |
| Sangamon | 30 Jan 1821 | Bond, Madison | Christian 1839, Logan 1839, Morgan 1823, Menard 1839, Dane 1839 |
| Schuyler | 13 Jan 1825 | Pike, Fulton | Brown 1839, McDonough 1826 |
| Scott | 16 Feb 1839 | Morgan | none |
| Shelby | 23 Jan 1827 | Fayette | Macon 1829, Moultrie 1843 |
| Stark | 02 Mar 1839 | Knox, Putnam | none |
| Stephenson | 04 Mar 1837 | Winnebago, Jo Daviess | none |
| Tazewell | 31 Jan 1827 | Fayette, Sangamon | McLean 1830, Mason 1841, Woodford 1841, Logan 1839 |
| Union | 02 Jan 1818 | Johnson | none |
| Vermilion | 18 Jan 1826 | Edgar | Champaign 1833, Iroquois 1823, La Salle 1831 |
| Wabash | 27 Dec 1827 | Edwards | none |
| Warren | 13 Jan 1825 | Pike | Henderson 1841 |
| Washington | 02 Jan 1818 | St. Clair | Clinton 1824 |
| Wayne | 26 Mar 1819 | Edwards | Clay 1824, Fayette 1821 |
| White | 09 Dec 1815 | Gallatin | Franklin 1818, Hamilton 1821, Jefferson 1839 |
| Whiteside | 16 Jan 1836 | Jo Daviess, Henry | none |
| Will | 12 Jan 1836 | Cook, Iroquois | Kankakee 1853 |
| Williamson | 28 Feb 1839 | Franklin | none |
| Winnebago | 16 Jan 1836 | Jo Daviess | Boone 1837, Stephenson 1837 |
| Woodford | 27 Feb 1841 | Tazewell, McLean | none |
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- This page was last modified on 10 April 2011, at 01:49.
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