There are one hundred and two counties in Illinois. St. Clair County was the first county established in what is today Illinois. Most counties in Illinois were named after early American leaders, especially of the American Revolutionary War, as well as soldiers from the Battle of Tippecanoe and the War of 1812.
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FayetteCounty is a county located in the state of Illinois. Based on the 2010 census, the
population was 22,140. Fayette County was
created on February 14, 1821. The countyseat is Vandalia. The county is named
for Marquis de la Fayette (1757-1834), French military officer who
was a key factor in the American and French Revolutions.
Etymology - Origin of Fayette County Name
The county is named in honor of the Marquis de LaFayette, French hero of the American Revolutionary War.