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and has now been replaced by MAF, the Master Address File.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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