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 12,716,164 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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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.

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 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

See all Illinois Counties by Population

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