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 12,821,813 people according to the US Census Bureau's 2021 American Community Survey.
  • The Illinois median household income in the past 12 months is $72,563 in 2021 inflation-adjusted dollars according to the US Census Bureau's 2021 American Community Survey.
  • Illinois has 5,412,995 housing units according to the US Census Bureau's 2021 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 2021 datasets – specifically the 2021 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 5,265,398
2 DuPage County 934,094
3 Lake County 714,484
4 Will County 696,403
5 Kane County 518,648
6 McHenry County 310,749
7 Winnebago County 285,471
8 Madison County 266,112
9 St. Clair County 258,597
10 Champaign County 206,583

Illinois Cities by Population

1 Chicago 2,742,119
2 Aurora 183,447
3 Joliet 150,323
4 Naperville 149,013
5 Rockford 148,942
6 Springfield 114,672
7 Elgin 114,156
8 Peoria 113,672
9 Waukegan 89,751
10 Champaign 88,343

Illinois Zip Codes by Population

1 60629 107,487
2 60618 95,078
3 60639 89,037
4 60632 87,395
5 60647 85,564
6 60804 84,905
7 60617 84,193
8 60608 83,689
9 60625 80,028
10 60634 77,520

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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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