ZP4: Address correction data and software

ZP4 is a database containing United States addresses, ZIP + 4® codes, and mail carrier route numbers, along with other supplemental postal databases (all maintained by the Postal Service™), plus complete automatic CASS Certified™ address correction software for Windows computers.

       Before ZP4 processing   After ZP4 processing
       ---------------------   --------------------
           walt disney         The Walt Disney Company
           114 5               114 5th Ave Fl 13
           newyork             New York NY 10011-5690

ZP4 was available from 1989 through November 30, 2017,
and has now been replaced by MAF, the Master Address File.
ZP4 is still available to users who license the necessary
supporting databases direct from the Postal Service.
Contact us for instructions on how to do that.

  • Frequently asked questions about ZP4
  • Tools and data included in ZP4
  • Outputs generated by ZP4
  • Snapshots of ZP4 screen images
  • Why all 5-digit ZIP Code™ lists are obsolete
  • Schools, companies, governments, and churches that have purchased ZP4

    ZP4 automatically corrects your address files and adds ZIP + 4 codes so you can send mail using discount postage rates.

  • Validate, correct, and standardize addresses
  • Minimize postage and prevent undeliverable mail
  • Complete ZIP + 4 database covering all U.S. mailing addresses
  • Includes the DPV® database for validating any individual house, apartment, or box
  • Fully exportable ZIP + 4 records for building custom lists and databases
  • Includes program-to-program source code examples for custom access
  • CASS Certified and DPV Certified by the Postal Service for confirmation of valid delivery points
  • Automatically process databases of any size
  • Automatically generates bulk mail forms 3553, 3600, and 3602
  • Easy-to-use point-and-click interface
  • Any number of employees and clients can simultaneously use all tools and data
  • Includes fonts for postal barcodes
  • Includes presort and printing software for discount First Class Automation or Standard Automation letters
  • Includes LACSLink to convert rural-style addresses to city-style addresses, and to convert renumbered boxes and renamed streets
  • Includes eLOT® to find enhanced line of travel data
  • Includes Geo to find latitudes, longitudes, tracts, and blocks
  • Includes SuiteLink to find business address secondary (suite) information
  • Includes RDI™ to detect residence vs. business addresses

    ZP4 contains all necessary Windows software and a complete mailing address validation database for the entire United States.


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