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 12,854,526 people according to the US Census Bureau's 2017 American Community Survey.
The Illinois median household income in the past 12 months is $61,229 in 2017 inflation-adjusted dollars according to the US Census Bureau's 2017 American Community Survey.
Illinois has 5,334,847 housing units according to the US Census Bureau's 2017 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 2017 datasets – specifically the 2017 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	5,238,541
2	DuPage County	931,826
3	Lake County	704,476
4	Will County	687,727
5	Kane County	529,402
6	McHenry County	308,043
7	Winnebago County	287,512
8	Madison County	266,153
9	St. Clair County	264,433
10	Champaign County	207,946

See all Illinois Counties by Population

Illinois Cities by Population

1	Chicago	2,722,586
2	Aurora	200,946
3	Rockford	148,640
4	Joliet	148,172
5	Naperville	146,431
6	Springfield	116,313
7	Peoria	115,424
8	Elgin	112,628
9	Waukegan	87,999
10	Champaign	85,710