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US ZIP code classification

ZIP codes are classified in the following way:

  • Unique - Unique zip codes are used by addresses that get high volumes of mail like universities, agencies, businesses and etc.
  • P.O.-box-only - P.O.-box-only zip codes are assigned only to P.O. boxes at a particular facility.
  • Military - The U.S.A. military is used military zip code to route mail.
  • Standard - Standard zip codes are all other ZIP codes.

US ZIP code: latitude and longitude

ZIP codes of the United States are also used to gather geographical statistics. Latitude and longitude is determined in the center-point of a ZIP code. This center-point is called ZIP Code Tabulation Area.

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