Illinois Outline Illinois Demographics by Cubit

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Free Illinois Demographic Starter Report

Get the Illinois demographic data that you need instantly. You can get the most current Illinois data from the US Census Bureau without spending 8 to 10 high-value hours searching the internet.

Email me a free Demographic Starter Report for the state of Illinois.

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Skip Hours of Internet Research.

Get Demographic Starter Reports for your Illinois city or county for just $19.99.

To learn more, click on the letter that the name of your city or county begins with.

How Current are the Data?

The Illinois demographics on this site are the most current data available from the US Census Bureau.

Currently, most data points are from 2015 datasets – specifically the 2015 American Community Survey (ACS) 5 year dataset. We use the Census’ ACS 5 year dataset for 3 reasons.

  1. It’s updated every year.
  2. It typically has the smallest margins of error of the Census’ ACS datasets.
  3. It allows for apples to apples comparisons of large geographies to small geographies (i.e. state data to city data).

We’re constantly updating the Starter Reports and this site with the most current data throughout the year.

Got questions about these Illinois demographics? Call us at 1-800-939-2130.

About Us is made by Cubit – a demographic data provider. Call us at 1-800-939-2130 or email us.

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Illinois Counties by Population

1 Cook County 5,203,499
2 DuPage County 929,368
3 Lake County 703,047
4 Will County 689,529
5 Kane County 531,715
6 McHenry County 307,004
7 Winnebago County 285,873
8 Madison County 265,759
9 St. Clair County 262,759
10 Champaign County 208,419

Illinois Cities by Population

1 Chicago 2,720,546
2 Aurora 200,661
3 Rockford 148,278
4 Joliet 147,861
5 Naperville 147,100
6 Springfield 116,565
7 Peoria 115,070
8 Elgin 112,111
9 Waukegan 88,475
10 Champaign 86,096

Products & Services

Spreadsheet Reports

Get the most important demographics for all cities or all counties in Illinois in an easy-to-use spreadsheet.


Radius Reports

Customized report about the people surrounding your business in 24 hours. Perfect for your business plan.

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Starter Reports

A colorful PDF with the most important demographics for cities & counties. A handy tool for new entrepreneurs.



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