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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.
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 is divided into 102 counties and, as of 2020, contained 1,300 municipalities consisting of cities, towns, and villages. The most populous city is Chicago with 2,746,388 residents while the least populous is Valley City with 14 residents. [2]
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.
Find the complete list of counties in Illinois, including detailed county information and their vital record offices contact details. Click here to learn more.
A map of Illinois Counties with County seats and a satellite image of Illinois with County outlines.
This map shows cities, towns, counties, interstate highways, U.S. highways, state highways, main roads and secondary roads in Illinois.
Illinois Counties Map with cities. Click on any of the counties on the map to see its population, economic data, time zone, and zip code (the data will appear below the map). Data is sourced from the US Census 2021.
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.
Illinois County Map: This map shows Illinois's 102 counties. Also available is a detailed Illinois County Map with county seat cities.