The 10 Biggest Cities
Illinois
ChicagoAbout 2,700,000 people.
AuroraAbout 180,000 people.
NapervilleAbout 150,000 people.
JolietAbout 150,000 people.
RockfordAbout 145,000 people.
ElginAbout 115,000 people.
SpringfieldAbout 115,000 people.
PeoriaAbout 110,000 people.
ChampaignAbout 90,000 people.
WaukeganAbout 90,000 people.