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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