Illinois Counties

Illinois Counties

by Vishul Malik



Most of the Illinois counties are named after the early leaders and soldiers of the American Revolutionary War, the Battle of Tippecanoe, and the War of 1812. Some of the counties are also named after Native American tribes, natural features, animals, and plants. The most populous city of the state, Chicago, is located in Cook County. The capital city of Illinois, Springfield, is located in Sangamon County.

How Many Counties in Illinois

The US state of Illinois has 102 counties. Check this Illinois County Map which provides the location of all counties on the Illinois Map.




Counties of Illinois

What are the 5 Biggest Counties in Illinois by Size?

The biggest counties in Illinois in terms of size are McLean,  LaSalle, Iroquois, Livingston, and Champaign counties.


What are the 5 Biggest Counties in Illinois by Population?

The biggest counties in Illinois in terms of population (2020) are Cook, DuPage, Lake, Will, and Kane counties.

Which is the Smallest County in Illinois?

The smallest county in Illinois (in terms of population) in Hardin County. Putnam County is the smallest county in terms of size. 

What are the Oldest and Newest Counties in Illinois?

St. Clair County is the oldest county, created in 1790. Ford County is the newest county, created in 1859. 


Which are the Richest and Poorest Counties in Illinois?

Kendall is the richest county, and Hardin is the poorest county in Illinois (in terms of median household income).

What are the top 5 Best Counties to Live in Illinois?

DuPage, McLean, Lake, Champaign, and Cook counties are the best counties to live in Illinois.

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Whiteside County Map, Illinois

Mountain Peaks in Whiteside County Mountain Peak/Hill Elevation [Meter] Thunderbolt Hill 194   Airports in Whiteside County Airport Name Cady Aerial RLA Restricted Landing Area Cgh Medical Center Heliport Doering’s…

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Will County Map, Illinois

Airports in Will County Airport Name Aero Four Airport Bolingbrook Medical Center Heliport Bolingbrook’s Clow International Airport Braidwood National Park Service Heliport Bult Field Chicago Glider Club Gliderport Chicagoland Speedway…

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Williamson County Map, Illinois

Mountain Peaks in Williamson County Mountain Peak/Hill Elevation [Meter] McKinney Hill 156 More Maps of Williamson County Williamson County Map, Texas Williamson County Map, Tennessee Airports in Williamson County Airport…

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Woodford County Map, Illinois

Mountain Peaks in Woodford County Mountain Peak/Hill Elevation [Meter] Nichols Mound 205   Airports in Woodford County Airport Name Corn Alley Airport Davison Restricted Landing Area Jay Schertz Farm Airport…

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Stephenson County Map, Illinois

Mountain Peaks in Stephenson County Mountain Peak/Hill Elevation [Meter] Bunker Hill 294   Airports in Stephenson County Airport Name Albertus Airport Cambier Airport Chester Wyss Airport Freeport/Dornink Airport Hillman Airport…

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Tazewell County Map, Illinois

Mountain Peaks in Tazewell County Mountain Peak/Hill Elevation [Meter] Little Mound 148 The Mound 159   Airports in Tazewell County Airport Name Hobby Hideaway RLA Illinois Valley Parachute Club Airport…

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Vermilion County Map, Illinois

Airports in Vermilion County Airport Name Danville Correctional Center Heliport Flying B Ranch Airport Hoopeston Community Memorial Hospital Heliport Lindys Airpark Melody Field Trisler Airport United Samaritans Medical Center Heliport…

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