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1. Illinois Block Groups 2002

2002. Geographic Data Technology, Inc. (GDT). Illinois Block Groups represents the U.S. Census block groups of Illinois. Environmental Systems Research Institute, Inc. (ESRI).

2. Illinois Tracts 2002

2002. Geographic Data Technology, Inc. (GDT). Illinois Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Illinois. Environmental Systems Research Institute, Inc. (ESRI).

3. Illinois ZIP Code Areas 2002

2001. Geographic Data Technology, Inc. (GDT). Illinois ZIP Code Areas represents five-digit ZIP Code areas used by the U.S. Postal Service to deliver mail more effectively. The first digit of ... Environmental Systems Research Institute, Inc. (ESRI).