MarketList of counties in Illinois
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List of counties in Illinois

There are 102 counties in Illinois. The most populous of these is Cook County, the second-most populous county in the United States and the home of Chicago, while the least populous is Hardin County. The largest by land area is McLean County, while the smallest is Putnam County. Illinois's FIPS state code is 17 and its postal abbreviation is IL.

Counties
Note: the links in the FIPS County Code column are to the United States Census Bureau page for that county. {{Countyrow|N=17|Num=043| Name=DuPage| Seat=Wheaton| Data2=1839| Data3=Cook County |Data4=DuPage River {{Countyrow|N=17|Num=069| Name=Hardin| Seat=Elizabethtown| Data2=1839| Data3=Pope County |Data4=Hardin County, Kentucky, which was named after John Hardin ==Defunct counties==
Defunct counties
• Dane County was renamed in 1840 to the current Christian County. • The original Knox County, Illinois, became extinct with the formation of the Illinois Territory in 1809 - or, more precisely, it became Knox County, Indiana. The modern Knox County, Illinois was formed much later and was not a part of the original Knox County. ==See also==
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