Chicago
geographical name
Chi·ca·go shə-ˈkä-(ˌ)gō 
-ˈkȯ-,
-gə 1
river in Chicago, Illinois, having a northern branch and a southern branch and originally flowing east into Lake Michigan but now flowing south through the southern branch and Chicago Sanitary and Ship Canal into the Des Plaines River
2
city and port on Lake Michigan in northeastern Illinois population 2,695,598
Note: Chicago is by far the most populous city in Illinois.
Chicagoan
shə-ˈkä-gō-ən
noun -ˈkȯ-