About

There have been several blog posts about open data in Chicago (see here and here) - though there doesn't seem to be a single registry of open data.

Political/administrative boundary data sets are available at:

• Boundary Data

Datasets include:

• Census Block
• Census Data -- November 2004
• Census Tracts
• City Boundary
• Citywide Wards Map
• Community Areas
• IL House
• IL Senate
• Surrounding Municipalities
• Neighborhoods
• Precincts
• TIFS 2008
• US Congress
• Zipcodes

Openness

Assume this is intended to be open, but no information found on whether or not data can legally be reused.