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
- Adams County Map
- Alexander County Map
- Bond County Map
- Boone County Map
- Brown County Map
- Bureau County Map
- Calhoun County Map
- Carroll County Map
- Cass County Map
- Champaign County Map
- Christian County Map
- Clark County Map
- Clay County Map
- Clinton County Map
- Coles County Map
- Cook County Map
- Crawford County Map
- Cumberland County Map
- DeKalb County Map
- De Witt County Map
- Douglas County Map
- DuPage County Map
- Edgar County Map
- Edwards County Map
- Effingham County Map
- Fayette County Map
- Ford County Map
- Franklin County Map
- Fulton County Map
- Gallatin County Map
- Greene County Map
- Grundy County Map
- Hamilton County Map
- Hancock County Map
- Hardin County Map
- Henderson County Map
- Henry County Map
- Iroquois County Map
- Jackson County Map
- Jasper County Map
- Jefferson County Map
- Jersey County Map
- Jo Daviess County Map
- Johnson County Map
- Kane County Map
- Kankakee County Map
- Kendall County Map
- Knox County Map
- La Salle County Map
- Lake County Map
- Lawrence County Map
- Lee County Map
- Livingston County Map
- Logan County Map
- Macon County Map
- Macoupin County Map
- Madison County Map
- Marion County Map
- Marshall County Map
- Mason County Map
- Massac County Map
- McDonough County Map
- McHenry County Map
- McLean County Map
- Menard County Map
- Mercer County Map
- Monroe County Map
- Montgomery County Map
- Morgan County Map
- Moultrie County Map
- Ogle County Map
- Peoria County Map
- Perry County Map
- Piatt County Map
- Pike County Map
- Pope County Map
- Pulaski County Map
- Putnam County Map
- Randolph County Map
- Richland County Map
- Rock Island County Map
- St. Clair County Map
- Saline County Map
- Sangamon County Map
- Schuyler County Map
- Scott County Map
- Shelby County Map
- Stark County Map
- Stephenson County Map
- Tazewell County Map
- Union County Map
- Vermilion County Map
- Wabash County Map
- Warren County Map
- Washington County Map
- Wayne County Map
- White County Map
- Whiteside County Map
- Will County Map
- Williamson County Map
- Winnebago County Map
- Woodford County Map
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.