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 12,716,164 people according to the US Census Bureau's 2020 American Community Survey.
  • The Illinois median household income in the past 12 months is $68,428 in 2020 inflation-adjusted dollars according to the US Census Bureau's 2020 American Community Survey.
  • Illinois has 5,373,385 housing units according to the US Census Bureau's 2020 American Community Survey.

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Skip Hours of Internet Research.

Get demographic data for any location in Illinois for just $49.

  • The most current data
  • Trustworthy — from US government data sources
  • Easy to Understand — jargon-free data
  • Most Popular data — like population, income & age
  • Confidence — includes proper citations & footnotes
  • Time Savings — Our customers tell us these reports save 10+ hours of internet research, data pulling & formatting.

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 2020 datasets – specifically the 2020 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 demographic 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 5,169,517
2 DuPage County 926,005
3 Lake County 699,682
4 Will County 689,704
5 Kane County 531,756
6 McHenry County 307,291
7 Winnebago County 283,635
8 Madison County 264,403
9 St. Clair County 261,186
10 Champaign County 210,006

Illinois Cities by Population

1 Chicago 2,699,347
2 Aurora 199,326
3 Naperville 147,734
4 Rockford 147,441
5 Joliet 147,323
6 Springfield 115,075
7 Peoria 112,644
8 Elgin 112,062
9 Champaign 88,288
10 Waukegan 87,157

Illinois Zip Codes by Population

1 60629 107,930
2 60618 94,646
3 60639 88,515
4 60632 86,715
5 60647 85,658
6 60617 82,101
7 60804 81,505
8 60608 80,011
9 60625 78,820
10 60623 77,732

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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 36 years.

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