Mind-boggled by Illinois Demographics?

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

  • The Illinois population is 12,671,821 people according to the US Census Bureau's 2019 Population Estimates Program.
  • The Illinois median household income in the past 12 months is $63,575 in 2018 inflation-adjusted dollars according to the US Census Bureau's 2018 American Community Survey.
  • Illinois has 5,347,268 housing units according to the US Census Bureau's 2018 American Community Survey.

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  • The most current data
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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 2018 datasets – specifically the 2018 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 Radius 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.

Illinois Counties by Population

1 Cook County 5,150,233
2 DuPage County 922,921
3 Lake County 696,535
4 Will County 690,743
5 Kane County 532,403
6 McHenry County 307,774
7 Winnebago County 282,572
8 Madison County 262,966
9 St. Clair County 259,686
10 Champaign County 209,689

Illinois Cities by Population

1 Chicago 2,693,976
2 Aurora 197,757
3 Naperville 148,449
4 Joliet 147,344
5 Rockford 145,609
6 Springfield 114,230
7 Elgin 110,849
8 Peoria 110,417
9 Champaign 88,909
10 Waukegan 86,075

Illinois Zip Codes by Population

1 60629 111,850
2 60618 94,395
3 60632 91,039
4 60639 90,517
5 60647 87,509
6 60623 85,979
7 60804 83,147
8 60617 82,534
9 60625 79,243
10 60608 79,205

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About Us

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

Cubit Founders Kristen and Anthony

Cubit's co-founders have been working with data for a combined 25 years.

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