Northern Illinois

Northern Illinois
Region of Illinois
Chicago, Illinois
Counties that are colored red are considered a part of the Northern Illinois region.
Country United States
State Illinois
Largest cityChicago
Population
9.7 million

Northern Illinois is a region generally covering the northern third of the U.S. state of Illinois. The region is by far the most populous of Illinois, with nearly 9.7 million residents as of 2010.

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