A radius map showing the Chicagoland area. Zone 1 - Downtown Chicago, Zone 2 - Chicago, Zone 3 - Outer Chicago City Limits and Inner Suburbs, Zone 4 - Ring Suburbs, Zone 5 - Newly Developing Suburbs, Zone 6 - Possible Future Development in Chicagoland.
Chicagoland is an informal name for the greater area surrounding Chicago. It has a population of about 9,443,356 (2005 est.) and an area of about 10,874 mi². It extends over 3 midwest states, and consists of about 12 counties:
Illinois:
- Cook County
- DuPage County
- Grundy County
- Kane County
- Kankakee County
- Lake County
- McHenry County
Indiana:
- Lake County
- Porter County
Wisconsin:
- Kenosha County
The term originated in the pages of the Chicago Tribune in the 1900s.
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