Illinois is divided into 102 counties. Here is the complete list:
Full List of all Counties in Illinois
- Adams County, IL
- Alexander County, IL
- Bond County, IL
- Boone County, IL
- Brown County, IL
- Bureau County, IL
- Calhoun County, IL
- Carroll County, IL
- Cass County, IL
- Champaign County, IL
- Christian County, IL
- Clark County, IL
- Clay County, IL
- Clinton County, IL
- Coles County, IL
- Cook County, IL
- Crawford County, IL
- Cumberland County, IL
- DeKalb County, IL
- DeWitt County, IL
- Douglas County, IL
- DuPage County, IL
- Edgar County, IL
- Edwards County, IL
- Effingham County, IL
- Fayette County, IL
- Ford County, IL
- Franklin County, IL
- Fulton County, IL
- Gallatin County, IL
- Greene County, IL
- Grundy County, IL
- Hamilton County, IL
- Hancock County, IL
- Hardin County, IL
- Henderson County, IL
- Henry County, IL
- Iroquois County, IL
- Jackson County, IL
- Jasper County, IL
- Jefferson County, IL
- Jersey County, IL
- Jo Daviess County, IL
- Johnson County, IL
- Kane County, IL
- Kankakee County, IL
- Kendall County, IL
- Knox County, IL
- Lake County, IL
- LaSalle County, IL
- Lawrence County, IL
- Lee County, IL
- Livingston County, IL
- Logan County, IL
- Macon County, IL
- Macoupin County, IL
- Madison County, IL
- Marion County, IL
- Marshall County, IL
- Mason County, IL
- Massac County, IL
- McDonough County, IL
- McHenry County, IL
- McLean County, IL
- Menard County, IL
- Mercer County, IL
- Monroe County, IL
- Montgomery County, IL
- Morgan County, IL
- Moultrie County, IL
- Ogle County, IL
- Peoria County, IL
- Perry County, IL
- Piatt County, IL
- Pike County, IL
- Pope County, IL
- Pulaski County, IL
- Putnam County, IL
- Randolph County, IL
- Richland County, IL
- Rock Island County, IL
- St. Clair County, IL
- Saline County, IL
- Sangamon County, IL
- Schuyler County, IL
- Scott County, IL
- Shelby County, IL
- Stark County, IL
- Stephenson County, IL
- Tazewell County, IL
- Union County, IL
- Vermilion County, IL
- Wabash County, IL
- Warren County, IL
- Washington County, IL
- Wayne County, IL
- White County, IL
- Whiteside County, IL
- Will County, IL
- Williamson County, IL
- Winnebago County, IL
- Woodford County, IL
Quick Facts
| Category | Quick Facts |
|---|---|
| Geography | Located in the Midwest, features flat plains, rolling hills, and rivers |
| History | Became the 21st U.S. state on December 3, 1818 |
| Economy | Strong in manufacturing, agriculture, and technology |
| Climate | Humid continental climate with hot summers and cold winters |
| Natural Attractions | Shawnee National Forest, Starved Rock State Park |
| Culture | Known for Chicago blues music, deep-dish pizza, and diverse culture |
| Miscellaneous | State bird is the Northern Cardinal, State flower is the Violet |
| Population | Approximately 12.8 million people as of 2020 Census |
| Notable People | Abraham Lincoln, Barack Obama, Oprah Winfrey |
| Notable Places | Chicago, Springfield, Galena |
| Bordering States | Borders Wisconsin to the north, Indiana to the east, Kentucky to the south, and Missouri and Iowa to the west |
| Official Website | https://www2.illinois.gov/ |
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