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Illinois County Map

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Illinois Map Extent

This Illinois county map displays its 102 counties. Illinois’ high number of counties ranks 7th highest in the United States falling behind just Texas, Georgia, VirginiaKentuckyMissouri and Kansas.

Cook County has the highest population in Illinois with over 5 million people. In fact, Cook County is the second-most populated county in the United States just behind Los Angeles County in California.

The largest county in size is McLean County at 1186.3 square miles in area. Then, this is followed by La Salle, Iroquois, and Livingston County. But the smallest county in Idaho is Putnam County just 172.3 square miles in area.

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Illinois county map


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