Untitled Document

Adams formed 13 Jan 1825 from Pike

Alexander County formed 1819 from Johnson County

Bond

Brown

Bureau

Calhoun formed 10 Jan 1825 from Pike

Carroll formed 22 Feb 1839 from Jo Daviess

Cass

Champaign County formed 20 Feb 1833 from Vermillion County

Christian County Dane County was formed 15 Feb 1839 and was renamed Christian 1 Feb 1840

Clark

Clay formed 23 Dec 1824 from Lawrence, Wayne and Fayette; Jasper 1831 and Richland 1841 formed from it.

Clinton

Coles County formed 25 Dec 1830 from Clark and Edgar; Cumberland 1843, Douglass 1859 formed from it.

Cook formed 15 Jan 1831 from Putnam; McHenry and Will 1836 and DuPage 1839 formed from it.

Crawford

Cumberland

Dane

DeKalb

DeWitt formed 1 March 1839 from McLean and Macon; Piatt formed from it in 1841.

Douglas

DuPage formed 9 Feb 1839 from Cook

Edgar County formed 3 Jam 1823 from Clark County; Vermillion 1826 and Coles 1830 formed from it.

Edwards County formed 28 Nov 1814 from Madison and Gallatin Counties; Crawford 1816, Wayne 1819, Lawrence 1821, Wabash 1827, and Jefferson 1839 formed from it.

Effingham

Fayette

Ford formed 17 Feb 1859 from Clark

Franklin County formed 2 Jan 1818 from White and Gallatin Counties; Williamson 1839 formed from it.

Fulton County formed 28 Jan 1823 from Pike County; Henry, Knox, Peoria, Putnam and Schuyler formed from it in 1825.

Gallatin formed 14 Sept 1812 from Randolph; Edwards 1814, White 1815, Pope 1816, Franklin 1818 and Saline formed from it.

Green formed 20 Jan 1820 from Madison; Jersey (1819 - sic) and Macoupin (1829) formed from it.

Grundy

Hamilton

Hancock formed 13 Jan 1825 from Pike

Hardin

Henderson

Henry formed 13 Jan 1825 from Fulton; Jo Daviess 1827, Whiteside 1836 formed from it.

Iroquois formed 26 Feb 1823 from Vermillion; Will 1836, Kankakee 1853 formed from it.

Jackson County formed 10 Jan 1816 from Randolph and Johnson Counties; Perry 1841 formed from it.

Jersey formed 26 Mar 1819 from Greene

Jo Daviess formed 27 Feb 1827 from Mercer, Henry and Putnam counties; Rock Island 1831, Ogle, Whiteside and Winnebago 1836, Carroll and Stephenson 1837 formed from it.

Johnson formed 1812 from Randolph; Alexander 1819, Jackson and Pope 1816, Union 1818, Massac and Pulaski 1843 formed from it.

Kane formed 1836 from La Salle; De Kalb 1837 and Kendall 1841 formed from it.

Kankakee

Kendall

Knox formed 13 Jan 1825 from Fulton; Stark formed from it in 1839.

Lake

LaSalle formed 15 Jan 1831 from Putnam and Vermillion; Kane1836, Livingston 1837, Grundy and Kendall 1841 formed from it.

Lawrence

Lee

Livingston

Logan County formed 15 Feb 1839 from Sangamon and Tazewell Counties.

Macon formed 1829 from Shelby; DeWitt 1839, Pratt 1841, and Moultrie 1843 formed from it.

Macoupin County formed 17 Jan 1829 from Madison and Greene Counties.

Madison County formed 14 Sep 1812 from StClair; Edwards 1814, Bond 1817, Green, Montgomery, Pike and Sangamon 1821, and Macoupin 1829 formed from it.

Marion

Marshall

Mason County formed 20 Jan 1841 from Tazewell County.

Massac County formed 8 Feb 1842 from Pope and Johnson Counties.

McDonough

McHenry

McLean County formed 25 Dec 1830 from Tazewell; LIvingston 1837, DeWitt 1839 and Woodford 1841 formed from it.

Menard County formed 15 Feb 1839 from Sangamon County.

Mercer

Monroe

Montgomery

Morgan formed 1823 from Sangamon; Cass 1837 and Scott 1839 formed from it.

Moultrie County formed 16 Feb 1843 from Shelby and Macon Counties.

Ogle formed 16 Jan 1836 from Jo Daviess; Lee formed from it in 1839

Peoria formed 13 Jan 1825 from Fulton

Perry County formed 29 Jan 1841 from Randolph and Jackson Counties.

Piatt County formed 20 Jan 1841 from DeWitt and Macon Counties.

Pike formed 31 Jan 1821 from Madison, Bond, Clark counties; Fulton 1823, Adams, Calhoun, Hancock, Mercer, Schuyler and Warren 1825 formed from it.

Pope

Pulaski County formed 3 Mar 1843 from Johnson County.

Putnam

Randolph

Richland County formed 24 Feb 1841 from Clay and Lawrence Counties.

Rock Island formed 9 Feb 1831 from Jo Daviess

St Clair County formed 27 Apr 1790 from the Northwest Territory; Randolph 1795, Madison 1812, Monroe 1816, and Washington 1818 formed from it.
In 1801, William Henry Harrison then Governor of Illinois, made St Clair and Randolph part of Indiana Territory; in 1803 he readjusted the boundaries. In 1805, Nathaniel Pope, acting territorial governor, put both counties in Indiana Territory.

Saline

Sangamon County formed 30 Jan 1821 from Bond and Madison; Morgan 1823, Christian, Logan, Menard and Dane 1839 formed from it.

Schuyler formed 1823 from Pike and Fulton; McDonough 1826 and Brown 1839 formed from it.

Scott formed 1839 from Morgan.

Shelby

Stark

Stephenson formed 4 Mar 1837 from Winnebago and Jo Daviess

Tazewell formed 1827 from Fayette and Sangamon; McLean 1830, Logan 1839, Mason and Woodford 1841 formed from it.

Union County formed 2 Jan 1818 from Johnson County.

Vermillion County formed 18 Jan 1826 from Edgar County; Iroquois 1823, LaSalle 1831, Champaign 1833 formed from it. (Spelling of Vermillion varies, sometimes one L, sometimes two)

Warren formed 1825 from Pike; Henderson formed from it in 1841.

Wayne formed 1819 from Edwards; Fayette 1821 and Clay 1823 formed from it.

Whiteside formed 16 Jan 1836 from Jo Daviess and Henry

Williamson County formed 28 Feb 1839 from Franklin County.

Woodford formed 1841 from Tazewell and McLean.