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21. Idaho ZIP Code Areas 2002

2001. Geographic Data Technology, Inc. (GDT). Idaho 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 a f... Environmental Systems Research Institute, Inc. (ESRI).

22. 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).

23. Indiana ZIP Code Areas 2002

2001. Geographic Data Technology, Inc. (GDT). Indiana 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 a... Environmental Systems Research Institute, Inc. (ESRI).

24. Iowa ZIP Code Areas 2002

2001. Geographic Data Technology, Inc. (GDT). Iowa 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 a fi... Environmental Systems Research Institute, Inc. (ESRI).

25. Kansas ZIP Code Areas 2002

2001. Geographic Data Technology, Inc. (GDT). Kansas 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 a ... Environmental Systems Research Institute, Inc. (ESRI).

26. Kentucky ZIP Code Areas 2002

2001. Geographic Data Technology, Inc. (GDT). Kentucky 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).

27. Louisiana ZIP Code Areas 2002

2001. Geographic Data Technology, Inc. (GDT). Louisiana 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).

28. Maine ZIP Code Areas 2002

2001. Geographic Data Technology, Inc. (GDT). Maine 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 a f... Environmental Systems Research Institute, Inc. (ESRI).

29. Maryland ZIP Code Areas 2002

2001. Geographic Data Technology, Inc. (GDT). Maryland 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).

30. Massachusetts ZIP Code Areas 2002

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