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Transverse Mercator projection, North American Datum 1983, State Plane Illinois West.
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Some assessment data can be downloaded through the mapping by clicking the "save" button on the parcels identify results screen. Contact the GIS department for fees for obtaining geographic and/or tabular ownership data.
The shapefile is a widely used file format for exchanging GIS data between GIS and CAD systems. One shapefile consists of several individual files pertaining to one feature class, like parcel polygon.
There are four general fees: maps, reports, cadastral data, and tabular data.