Census data provides information surrounding neighborhood boundaries, demographics, population estimates, education, economy, and business.
Government records and maps help to provide a historical view of the neighborhood and its developments.
Harold Washington Library Center has a great amount of Illinois records and maps available on the 5th floor. You can search their catalog before you go to the library, or you can ask a reference librarian on the 5th floor where it says "Government Information". If you have a Chicago Public Library card, you may be able to check out some items. Otherwise, you can use the materials in the library any time it is open.
Google's advanced search features provide information about the history, boundaries, and demographics of the neighborhood.
How to Use Google Advanced Search: