Counties and the pupulation in Illinois: Cook county, DuPage county, Lake county, Will county, Kane county, McHenry county, Winnebago county, St. Clair county, Madison county, Champaign county, Sangamon county, Peoria county | USANearBy.com

Counties in Illinois Cities in Illinois

1
2
3
4
5
Next »

Map	County Name	Population
	Cook County, IL	5,194,675
	DuPage County, IL	916,924
	Lake County, IL	703,462
	Will County, IL	677,560
	Kane County, IL	515,269
	McHenry County, IL	308,760
	Winnebago County, IL	295,266
	St. Clair County, IL	270,056
	Madison County, IL	269,282
	Champaign County, IL	201,081
	Sangamon County, IL	197,465
	Peoria County, IL	186,494

© 2026