Mind-boggled by Illinois Demographics?

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 12,821,497 people according to the US Census Bureau's 2018 American Community Survey.
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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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.

It’s updated every year.
It typically has the smallest margins of error of the Census’ ACS datasets.
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	5,223,719
2	DuPage County	931,743
3	Lake County	703,619
4	Will County	688,697
5	Kane County	530,839
6	McHenry County	307,789
7	Winnebago County	286,174
8	Madison County	265,670
9	St. Clair County	263,463
10	Champaign County	209,448

See all Illinois Counties by Population

Illinois Cities by Population

1	Chicago	2,718,555
2	Aurora	200,660
3	Joliet	147,957
4	Rockford	147,881
5	Naperville	147,411
6	Springfield	116,459
7	Peoria	114,512
8	Elgin	113,023
9	Waukegan	87,571
10	Champaign	86,791