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Macoupin County (Ill.)
Located in west-central Illinois, the county was named for Macoupin Creek, which runs near the county seat of Carlinville. It was formed from Greene and Madison Counties in 1829.
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Winnebago County (Ill.)
Located on the northern border with Wisconsin, the county is named for the Native American tribe who populated the area. The county seat is Rockford.
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Morgan County (Ill.)
Located in west-central Illinois, the county was named for Revolutionary War Deneral Daniel Morgan. The county seat is Jacksonville.
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Kankakee County (Ill.)
Located along the Indiana border in eastern Illinois, the county takes its name from the Kankakee River, which flows through it. The county seat is also named Kankakee.
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Hancock County (Ill.)
Located along the Mississippi River on the western edge of the state, the county was named for John Hancock, famed signatory of the Declaration of independence. The county seat is Carthage.
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Coles County (Ill.)
Located in east-central Illinois, the county was named for Edward Coles, Illinois governor. The county seat is Charleston.
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Jackson County (Ill.)
Located in the south-western corner of Illinois, the county was named for President Andrew Jackson.
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Union County (Ill.)
The county is located in the southwestern tip of Illinois, along the Mississippi River bordering Missouri, and the county seat is Jonesboro. It was named for the union meeting, a joint revival by Baptists and Old German Baptist Brethren.
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Cook County (Ill.)
Located in northeast Illnois along Lake Michigan, the county seat is Chicago. The county is name dfor Daniel Pope Cook (1794–1827), the first state Attorney General of Illinois.