Zip Codes are not polygons, and therefore do not have boundaries. Zip Codes are lines (delivery routes) or points (Post Offices). See the FAQ on the old Census ...
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illinois-zip-code-shapefile
The maps have been developed using the CV XE GIS software and show the PUMA shapefile boundaries in context of an MapQuest OpenStreetMap tile layer.. Available in shapefile format free Illinois GIS shapefiles and Cartographic illinois zip code shapefile File - KMLs pages part. Please understand that you use this at .... Illinois Block Groups. 1999. Illinois Block Groups ... Illinois Tracts. 1999. Illinois Tracts represents the ... Illinois ZIP Code Areas. 1999. Illinois ZIP Code Areas ... 939c2ea5af