from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. The metropolitan area of Chicago, including parts of Illinois, Indiana, and Wisconsin.
Chicago + land. Credit for placing the term in common use is generally give to Colonel Robert R. McCormck, editor and publisher of the Chicago Tribune, first using it on page 1 of the July 27, 1926 issue, although it may have been coined much earlier. (Wiktionary)