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 12,801,539 people according to the US Census Bureau's 2016 Population Estimates Program.
The Illinois median household income in the past 12 months is $57,574 in 2015 inflation-adjusted dollars according to the US Census Bureau's 2015 American Community Survey.
Illinois has 5,303,675 housing units according to the US Census Bureau's 2015 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 2015 datasets – specifically the 2015 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	5,203,499
2	DuPage County	929,368
3	Lake County	703,047
4	Will County	689,529
5	Kane County	531,715
6	McHenry County	307,004
7	Winnebago County	285,873
8	Madison County	265,759
9	St. Clair County	262,759
10	Champaign County	208,419

See all Illinois Counties by Population

Illinois Cities by Population

1	Chicago	2,704,958
2	Aurora	201,110
3	Joliet	148,262
4	Rockford	147,651
5	Naperville	147,122
6	Springfield	115,715
7	Peoria	114,265
8	Elgin	112,123
9	Waukegan	88,182
10	Champaign	86,637