Illinois County Map Formation by Year
1790
1795
1796
1800
1801
1803
1809
1812
1813
1814
1816
1817
1818
1819
1821
1822
1823
1824
1825
1826
1827
1829
1830
1831
1833
1834
1835
1836
1837
1839
1840
1841
1843
1845
1847
1848
1851
1852
1853
1854
1855
1859
1869
Illinois County Map Abbreviations
unorg. = unorganized
g. = gained
w. = with
fr. = from
atmt. = attachment
exch = exchanged
nca.= non county area
ch. = changed
Ad -
Adams
Al -
Alexander
Bon -
Bond
Boo -
Boone
Br -
Brown
Bu -
Bureau
Cal -
Calhoun
Car -
Carroll
Cas -
Cass
Cha -
Champaign
Chr -
Christian
Cli -
Clinton
Clk -
Clark
Cly -
Clay
Col -
Coles
Coo -
Cook
Cr -
Crawford
Cu -
Cumberland
DK -
De Kalb
Do -
Douglas
DW -
De Witt
DP -
DuPage
Edg -
Edgar
Edw -
Edwards
Ef -
Effingham
Fa -
Fayette
Fo -
Ford
Fr -
Franklin
Fu -
Fulton
Ga -
Gallatin
Gr -
Grundy
Gre -
Greene
Ham -
Hamilton
Han -
Hancock
Har -
Hardin
Hry -
Henry
Hsn -
Henderson
Ir -
Iroquois
Jac -
Jackson
Jas -
Jasper
JD -
Jo Daviess
Jef -
Jefferson
Jer -
Jersey
Jo -
Johnson
Ke -
Kendall
Kke -
Kankakee
Kn -
Knox
Kne -
Kane
Lak -
Lake
Law -
Lawrence
Lee -
Lee
Li -
Livingston
Lo -
Logan
LS -
La Salle
Mad -
Madison
McD -
McDonough
McH -
McHenry
McL -
McLean
Mcn -
Macon
Men -
Menard
Mer -
Mercer
Mor -
Morgan
Mou -
Moultrie
Mpn -
Macoupin
Mrn -
Marion
Mro -
Monroe
Msc -
Massac
Msl -
Marshall
Msn -
Mason
Mty -
Montgomery
Og -
Ogle
Peo -
Peoria
Per -
Perry
Pia -
Piatt
Pik -
Pike
Po -
Pope
Pul -
Pulaski
Put -
Putnam
Ra -
Randolph
Ri -
Richland
RI -
Rock Island
Sal -
Saline
San -
Sangamon
SC -
St. Clair
Sch -
Schuyler
Sco -
Scott
Sh -
Shelby
Sta -
Stark
Ste -
Stephenson
Ta -
Tazewell
Un -
Union
Ve -
Vermilion
Wab -
Wabash
War -
Warren
Was -
Washington
Way -
Wayne
Wil -
Will
Win -
Winnebago
Wo -
Woodford
Wsd -
Whiteside
Wsn -
Williamson
Wte -
White