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Government

NationalAtlas.gov - US National Online Atlas

The US National Atlas website offers dynamic, interactive thematic maps, multiple map generators for creating your own custom maps based on available government data, as well as raw data available for download by GIS professionals.

Slightly outdated Chicago GIS data at U of Chicago

The University of Chicago Library hosts a page with a smattering of Chicago shapefiles for ward district maps of the 90s, police beats, census tracts, and community areas.  Most of this, as noted on the page, has been superseded by the City's own GIS portal, but the community area data should still be good.  No license is given although there is contact info for a curator.

FEMA GIS system

Free download for a patch. Floods, hurricane winds, and earthquakes.

Pennsylvania Department of Agriculture on GIS

Interested in GIS and agriculture? Have the urge to shower yourself in government-made powerpoint presentation? Here is a start.

Illinois Department of Transportation: GIS

GIS-T is an interesting field. This just an Illinois data portal, but with a little searching you can find the same for any state.