IL Co Origins
Compiled by James W. Blankenship jkblank1(at)sbcglobal.net
Northwest Territory created 13Jul1787
Illinois created 12Dec1778
from Northwest Territory
St.Clair created 27Arp1790
from Illinois
Knox (Old) created
20Jun1790 from Northwest Territory
Randolph (Old)
created 05Oct1795 from Illinois
Wayne (Old) created 1796
from Northwest Territory
Indiana Territory
created 07May1800 from Northwest Territory
Clark (Old) created
03Feb1801 from Northwest Territory
Ohio statehood Feb 19 1803
Dearborn created
07Mar1803 from Clark
Michigan Territory created 11Jan1805 from Wayne(Old)
Harrison created
01Dec1808 from Clark & Knox
Illinois Territory created 03Feb1809 from Randolph (Old) &
St.Clair
Gallatin created
14Sep1812 from Randolph
Madison created
14Sep1812 from St.Clair
Johnson created
14Sep1812 from Randolph
Edwards created
28Nov1814 from Gallatin & Madison
White created 09Dec1815 from Gallatin
Monroe created
06Jan1816 from Randolph & St.Clair
Jackson created
10Jan1816 from Johnson & Randolph
Pope created
10Jan1816 from Gallatin & Johnson
Crawford created 31Dec1816 from Edwards
Bond created
04Jan1817 from Madison
Franklin created
02Jan1818 from Gallatin & White
Union created
02Jan1818 from Johnson
Washington created 02Jan1818 from St.Clair
Jefferson created
26Mar1819 from Edwards & White
Wayne created 26Mar1819
from Edwards
Illinois statehood 03
Dec1818
Adams created 13Jan1825
from Pike
Alexander created
04Mar1819 from Johnson
Bond created 04Jan1817
from Madison
Boone created 03Mar1836
from Winnebago
Brown created
01Feb1839 from Schuyler
Bureau created
28Feb1837 from Putnam
Calhoun created
January 10, 1825 from Pike
Carroll created 1839
from JoDaviess from Pike
Cass created
03Mar1937 from Morgan
Champaign created
20Feb1833 from Vermilion
Christian created 1840
form Dane Renamed
Clark created
22Mar1819 from Crawford
Clay created
23Dec1824 from Fayette, Lawrence & Wayne
Clinton created
27Dec1824 from Bond, Crawford, Fayette & Washington
Coles created
25Dec1830 from Clark & Edgar
Cook created
15Jan1831 from Putnam
Crawford created
31Dec1816 from Edwards
Cumberland created 02Mar1843
from Coles
Dane created 15Feb1839
from Sangamon, Montgomery, and Shelby
DeKalb created
04Mar1837 from Kane
Dewitt created
01Mar1839 from Macon & McLean
Douglas created
08Feb1959 from Coles
DuPage created
09Feb1839 from Cook
Edgar created
03Jan1823 from Clark
Effingham created
15Feb1831 from Crawford & Fayette
Fayette created 14Feb1821 from Bond, Clark, Jefferson &
Wayne
Ford created
17Feb1859 from Clark
Franklin created
02Jan1818 from Gallatin & White
Fulton created
28Jan1823 from Pike
Gallatin created
14Sep1812 from Randolph
Greene created
20Jan1821 from Madison
Grundy created
17Feb1841 from LaSalle
Hamilton created 08
Feb1821 from White
Hancock created
13Jan1825 from Pike & Unorganized Territory
Hardin created
02Mar1839 from Pope
Henderson created
20Jan1841 from Warren
Henry created
13Jan1825 from Filton
Iroquois created
26Feb1833 from Vermilion
Jackson created
10Jan1816 from Johnson & Randolph
Jasper created
15Feb1831 from Clay Crawford
Jefferson created
26Mar1819 from Edwards & White
Jersey created
28Feb1839 From Greene
JoDaviess created
17Feb1827 from Henry, Mercer & Putnam
Johnson created
14Sep1812 from Randolph
Kane created
16Jan1836 from LaSalle
Kankakee created
11Feb1853 from Iroquois & Will
Kendall created 19Feb1841
from Kane & LaSalle
Knox created
13Jan1825 from Fulton
LaSalle created
15Jan1831 from Putnam & Vermilion
Lake created
01Mar1839 from McHenry
Lawrence created
16Jan1821 from Crawford & Edwards
Lee created 27Feb1839
from Ogle
Livingston created
27Feb1837 from LaSalle & McLean
Logan created
15Feb1839 from Sangamon
Macon created
19Jan1821 from Shelby
Macoupin created
17Jan1829 from Greene & Madison
Madison created
14Sep1812 from St.Clair
Marion created 24Jan1823
from Fayette & Jefferson
Marshall created
19Jan1839 from Putnam
Mason created
20Jan1841 from Menard & Tazewell
Massac created
08Feb1843 from Johnson & Pope
McDonough created
25Jan1826 from Schuyler
McHenry created
16Jan1836 from Cook
McLean created
25Dec1830 from Tazewell & Unorganized Territory
Menard created
15Feb1839 from Sangamon
Mercer created
13Jan1825 from Pike & Unorganized Territory
Monroe created
06Jan1816 from Randolph & St.Clair
Montgomery created
12Feb1821 from Bond & Madison
Morgan created
31Jan1823 from Sangamon
Moultrie created
16Feb1843 from Macon & Shelby
Ogle created 16Jan1836 from
JoDaviess
Peoria created
13Jan1825 from Fulton
Perry created 29Jan1827 from Jackson & Randolph
Piatt created 27Jan1841 from DeWitt & Macon
Pike created 31Jan1821 from Bond, Clark & Madison
Pope created 10Jan1816 from Gallatin & Johnson
Pulaski created 03Mar1843 from Johnson
Putnam created 13Jan1825 from Fulton
Randolph created
05Oct1795 from Illinois
Richland created 24Feb1841 from Clay & Lawrence
Rock Island created 09Feb1831 from JoDaviess
Saline created 25Feb1847
from Gallatin
Sangamon created 30Jan1821 from Northwest Territory
Schuyler created
13Jan1825 from Fulton & Pike
Scott created 16Feb 1839 from Morgan
Shelby created 23Jan1827 from Fayette
St.Clair created 27Arp1790 from Illinois
Stark created 02Mar1839 from Knox & Putnam
Stephenson created 04Mar1837 from JoDaviess & Winnebago
Tazewell created
31Jan1827 from Sangamon
Union created 02Jan1818
from Johnson
Vermilion created
18Jan1826 from Edgar
Wabash created
27Dec1824 from Edwards
Warren created 13Jan1825 from Pike
Washington created 02Jan1818 from St.Clair
Wayne created 26Mar1819 from Edwards
White created 09Dec1815 from Gallatin
Whiteside created
16Jan1836 from JoDaviess & Henry
Will created
12Jan1836 from Cook & Iroquois
Williamson created
28Feb1839 from Franklin
Winnebago created 16Jan1836 from JoDaviess
Woodford created 27Feb1841 from McLean & Tazewell