 | This article needs additional citations for verification. (October 2013) |
Northern Illinois | |
|---|---|
.jpg) Chicago, Illinois | |
 Counties that are colored red are considered a part of the Northern Illinois region. | |
| Country |  United States |
| State |  Illinois |
| Largest city | Chicago |
| Population | 9.7 million |
Northern Illinois is a region generally covering the northern third of the U.S. state of Illinois.[1][2] The region is by far the most populous of Illinois, with nearly 9.7 million residents as of 2010.
- ^ "Regions of Illinois". Illinois Department of Natural Resources. Retrieved 4 October 2013.
- ^ "Illinois Regions". Illinois Environmental Protection Agency. Retrieved 4 October 2013.