Counties of Illinois -- Dates of Formation
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COUNTIES OF ILLINOIS -- DATES OF FORMATION
1790. St. Clair, April 27.
1795. Randolph, October 5.
1812. Gallatin, Johnson and Madison, September 14.
1814. Edwards, November 28.
1815. White, December 9.
1816. Monroe, January 6; Jackson and Pope, January 10; Crawford, December 31.
1817. Bond, January 4.
1818. Franklin, Union and Washington, January 2.
1819. Alexander, March 4; Clark, March 22; Jefferson and Wayne, March 26.
1821. Lawrence, January 16; Greene, January 20; Sangamon, January 30; Pike, January 31; Hamilton, February 8; Montgomery, February 12; Fayette, February 14.
1823. Edgar, January 3; Marion, January 24; Fulton, January 28; Morgan, January 31.
1824. Clay, December 23; Clinton and Wabash, December 27.
1825. Calhoun, January 10; Adams, Hancock, Henry, Knox, Mercer, Peoria, Putnam, Schuyler and Warren, January 13.
1826. Vermilion, January 18; McDonough, January 25.
1827. Shelby, January 23; Perry, January 29; Tazewell, January 31; JoDaviess, February 27.
1829. Macoupin, January 17; Macon, January 19.
1830. Coles and McLean, December 25.
1831. Cook and LaSalle, January 15; Rock Island, February 9; Effingham and Jasper, February 15.
1833. Champaign, February 20; Iroquois, February 26.
1836. Will, January 12; Kane, McHenry, Ogle, Whiteside and Winnebago, January 16.
1837. Livingston, February 27; Bureau, February 28; Cass, March 3; Boone, DeKalb and Stephenson, March 4.
1839. Marshall, January 19; Brown, February 1; DuPage, February 9; Christian, Logan and Menard, February 15; Scott, February 16; Carroll, February 22; Lee, February 27; Jersey and Williamson, February 28; DeWitt and Lake, March 1; Hardin and Stark, March 2.
1841. Henderson, Mason and Piatt, January 20; Grundy, February 17; Kendall, February 19; Richland, February 24; Woodford, February 27.
1843. Massac, February 8; Moultrie, February 16; Cumberland, March 2; Pulaski, March 3.
1847. Saline, February 25.
1853. Kankakee, February 11.
1859. Douglas, February 8; Ford, February 17.
[Note.--The dates given above are the dates on which the proclamation was issued or the act approved without reference to the time of taking effect.]