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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.
See a county map of Illinois on Google Maps with this free, interactive map tool. This Illinois county map shows county borders and also has options to show county name labels, overlay city limits and townships and more. To do a county lookup by address, type the address into the “Search places” box above the map.
There are 102 counties in the state of Illinois. Old 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. It became Knox County, Indiana.
Map of Illinois Counties. Showing county seats Number of counties: 102.
A map of Illinois Counties with County seats and a satellite image of Illinois with County outlines.
Illinois Counties - Cities, Towns, Neighborhoods, Maps & Data. There are 102 counties in Illinois. All counties are functioning governmental units; each is governed by a board with between 5 and 29 members.
Illinois Counties. There are 102 counties in the State of Illinois. The Illinois Statutes provide for three types of county government: counties under township organization (84), counties under commission form (17), and counties under executive form (1).
The U.S. state of Illinois is divided into 102 Counties. Explore the Illinois County Map, all Counties list along with their County Seats in alphabetical order and their population, areas and the date of formation.
Welcome to our alphabetical list of counties in Illinois A-Z! In addition to a comprehensive list of the 102 counties in Illinois, at the bottom of this page, we answer questions like: How many counties is in Illinois? What is Illinois smallest county? What is the largest county in Illinois by size?
List of the Counties of Illinois: Showing 1 to 102 of 102 entries. Largest Counties in Illinois by Population. Cook County. Chicago, Illinois. Cook County is the most populous county in Illinois and an epicenter of culture, commerce, and history.