ADAMS
Formed in 1825 from Pike Co.
ALEXANDER
Formed in 1819 from Union Co.
BOND
Formed in 1818 from Madison Co.
BOONE
Formed in 1836 from Winnebago Co.
BROWN
Formed in 1837 from Schuyler Co.
BUREAU
Formed in 1837 from Putnam Co.
CALHOUN
Formed in 1825 from Pike Co.
CARROLL
Formed in 1839 from Jo Daviess Co.
CASS
Formed in 1837 from Morgan Co.
CHAMPAIGN
Formed in 1833 from Vermilion Co.
CHRISTIAN
Name changed from Dane Co. in 1840; Dane formed from Montgomery, Sangamon, & Shelby Co.s in 1839
CLARK
Formed in 1819 from Crawford Co.
CLAY
Formed in 1824 from Crawford, Fayette, & Wayne Co.s
CLINTON
Formed in 1824 from Bond & Washington Co.s
COLES
Formed in 1830 from Clark & Edgar Co.s
COOK
Formed in 1831 from Putnam Co.
CRAWFORD
Formeed in 1816 from Edwards Co. (prior to IL statehood)
CUMBERLAND
Formed in 1843 from Coles Co.
DEKALB
Formed in 1837 from Kane Co.
DEWITT
Formed in 1839 from Macon & McLean Co.s
DOUGLAS
Formed in 1859 from Coles Co.
DUPAGE
Formed in 1839 from Cook Co.
EDGAR
Formed in 1823 from Clark Co.
EDWARDS
Formed in 1814 from Gallatin & Madison Co.s (prior to IL statehood)
EFFINGHAM
Formed in 1831 from Crawford & Fayette Co.s
FAYETTE
Formed in 1821 from Bond, Clark, Crawford, & Jefferson Co.s
FORD
Formed in 1859 from Vermilion Co. (unorganized)
FRANKLIN
Formed in 1818 from Gallatin & White Co.s (prior to IL statehood)
FULTON
Formed in 1823 from Pike Co.
GALLATIN
Formed in 1812 from Randolph (prior to IL statehood)
GREENE
Formed in 1821 from Madison Co.
GRUNDY
Formed in 1841 from LaSalle Co.
HAMILTON
Formed in 1821 from White Co.
HANCOCK
Formed in 1825 from Pike Co.
HARDIN
Formed in 1839 from Gallatin & Pope Co.s
HENDERSON
Formed in 1841 from Warren Co.
HENRY
Formed in 1825 from Fulton Co. (unorganized)
IROQUOIS
Formed in 1833 from Vermilion (unorganized)
JACKSON
Formed in 1816 from Johnson & Randolph Co.s (prior to IL statehood)
JASPER
Formed in 1831 from Clay & Crawford Co.s
JEFFERSON
Formed in 1819 from Edwards & White Co.s
JERSEY
Formed in 1839 from Greene Co.
JO DAVIESS
Formed in 1827 from Henry & Putnam Co.s
JOHNSON
Formed in 1812 from Randolph (prior to IL statehood)
KANE
Formed in 1836 from LaSalle (unorganized) & Cook Co.s
KANKAKEE
Formed in 1853 from Ford, Iroquois, & Will Co.s
KENDALL
Formed in 1841 from LaSalle & Kane Co.s
KNOX
Formed in 1825 from unorganized (Fulton), Fulton, Henry
LAKE
Formed in 1839 from McHenry Co.
LASALLE
Formed in 1831 from Putnam & Tazewell (unorganized) Co.
LAWRENCE
Formed in 1821 from Crawford & Edwards Co.
LEE
Formed in 1839 from Ogle Co.
LIVINGSTON
Formed in 1837 from LaSalle, McLean, & Vermilion (unorganized) Co.s
LOGAN
Formed in 1839 from McLean, Sangamon, & Tazewell Co.s
MACON
Formed in 1829 from Shelby Co. (unorganized)
MACOUPIN
Formed in 1829 from Greene (unorganized) & Madison Co.s
MADISON
Formed in 1812 from St. Clair Co. (prior to IL statehood)
MARION
Formed in 1823 from Fayette & Jefferson Co.s
MARSHALL
Formed in 1839 from Putnam & LaSalle Co.s
MASON
Formed in 1841 from Menard & Tazewell Co.s
MASSAC
Formed in 1843 from Johnson & Pope Co.s
MCDONOUGH
Formed in 1826 from Schuyler Co.
MCHENRY
Formed in 1836 from Cook & LaSalle (unorganized) Co.s
MCLEAN
Formed in 1830 from Tazewell & Tazewell (unorganized) Co.s
MENARD
Formed in 1839 from Sangamon Co.
MERCER
Formed in 1825 from Pike Co. (unorganized)
MONROE
Formed in 1816 from Randolph & St. Clair Co.s (prior to IL statehood)
MONTGOMERY
Formed in 1821 from Bond & Madison Co.s
MORGAN
Formed in 1823 from Greene (unorganized) & Sangamon Co.s
MOULTRIE
Formed in 1843 from Macon & Shelby Co.s
OGLE
Formed in 1836 from Jo Daviess & LaSalle (unorganized) Co.s
PEORIA
Formed in 1825 from Fulton & Fulton (unorganized) Co.s
PERRY
Formed in 1827 from Jackson & Randolph Co.s
PIATT
Formed in 1841 from DeWitt & Macon Co.s
PIKE
Formed in 1821 from Madison Co.
POPE
Formed in 1816 from Gallatin & Johnson Co.s (prior to IL statehood)
PULASKI
Formed in 1843 from Alexander & Johnson Co.s
PUTNAM
Formed in 1825 from Edgar & Fulton Co.s (unorganized)
RANDOLPH
Formed in 1795 from St. Clair Co. & Northwest Territory (prior to IL statehood)
RICHLAND
Formed in 1841 from Clay & Lawrence Co.s
ROCK ISLAND
Formed in 1831 from Jo Daviess Co.
SALINE
Formed in 1847 from Gallatin Co.
SANGAMON
Formed in 1821 from Bond & Madison Co.s
SCHUYLER
Formed in 1825 from Pike Co. (unorganized)
SCOTT
Formed in 1839 from Morgan Co.
SHELBY
Formed in 1827 from Fayette Co.
STARK
Formed in 1839 from Knox & Putnam Co.s
ST. CLAIR
Formed in 1790 from Northwest Territory (prior to IL statehood)
STEPHENSON
Formed in 1837 from Jo Daviess & Winnebago Co.s
TAZEWELL
Formed in 1827 from Peoria (unorganized) & Fayette Co.s
UNION
Formed in 1818 from Johnson & Jackson Co.s
VERMILION
Formed in 1826 from Edgar Co. (unorganized)
WABASH
Formed in 1824 from Edwards Co.
WARREN
Formed in 1825 from Pike Co. (unorganized)
WASHINGTON
Formed in 1818 from St. Clair Co. (prior to IL statehood)
WAYNES
Formed in 1819 from Edwards Co.
WHITE
Formed in 1815 from Madison Co. (prior to IL statehood)
WHITESIDE
Formed in 1836 from Jo Daviess & Henry Co.s
WILL
Formed in 1836 from Cook & Iroquois Co.s
WILLIAMSON
Formed in 1839 from Franklin Co.
WINNEBAGO
Formed in 1836 from Jo Daviess & LaSalle (unorganized) Co.s
WOODFORD
Formed in 1841 from McLean & Tazewell Co.s
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