ZP4 includes...

  • Windows CASS Certified™ address correction engine supporting Dynamic Data Exchange (DDE) and Dynamic Link Library (DLL) interfaces.
  • Current and complete ZIP + 4®, DPV®, LACSLink®, SuiteLink™, RDI™, CRC, and eLOT® databases licensed from and maintained by the Postal Service™.
  • Windows applications, including source code, for interactively searching, browsing, and exporting the ZIP + 4 database.
  • The exportable Geo database of ZIP + 4 latitudes and longitudes and Census tract and block numbers.
  • Windows applications (both interactive window-based and unattended command line-based), including source code, for scrubbing and validating address lists in open formats such as text or dBase (.DBF) files, and in proprietary database formats such as Access, Excel, FileMaker, Oracle, SQL Server, and many others.
  • High-level and low-level web servers, including source code, demonstrating HTTP interfaces to ZP4 with HTML and XML output.
  • Source code for OLE/ActiveX/COM servers (both in-process and out-of-process) and clients interfaced to ZP4.
  • Visual Basic and VB.NET source code demonstrating direct Visual Basic-to-ZP4 address correction.
  • C and C# source code demonstrating how to call ZP4's address correction interface.
  • Delphi source code demonstrating direct Delphi-to-ZP4 address correction.
  • Sample HTML, Active Server Page VBScript code, and ISAPI source code, demonstrating Web interfaces to ZP4.
  • Visual Basic source code for an ActiveX drag-and-drop control interface to ZP4, including a sample client.
  • Source code for networked address correction clients and servers using UDP protocols.
  • Access database and source code demonstrating direct Access-to-ZP4 address correction.
  • FoxPro database and source code demonstrating direct FoxPro-to-ZP4 address correction.
  • FileMaker database and source code demonstrating direct FileMaker-to-ZP4 address correction.
  • Paradox database and source code demonstrating direct Paradox-to-ZP4 address correction.
  • Visual Basic for Applications scripts demonstrating direct Word-to-ZP4 address correction.
  • Java source code demonstrating Java-to-ZP4 address correction.
  • A sample spreadsheet demonstrating direct Excel-to-ZP4 address correction.
  • Text-file lists for all city, state, county, and five-digit ZIP Code™ data.
  • Windows application and source code for searching, browsing, and exporting the five-digit ZIP® database.
  • Tools for sorting and printing barcoded mail and forms and reports to qualify for certain bulk mail discounts.
  • TrueType barcode fonts so any Windows application can display or print postal barcodes.
  • Step-by-step tutorials, including over 100 screenshots.
  • Numerous documentation files and additional utility programs with source code, including a name parser, gender tagger, and duplicate detector.


  • Go to the ZP4 home page.