Data Files
06/25/2008
Enhanced Line of Travel (eLOT) Sample File

This document provides a sample data file for eLOT.

Data Files
04/23/2008
Computerized Delivery Sequence (CDS) Sample ZIP Code™

This document contains sample ZIP Code™ file for CDS.

Data Files
03/08/2008
USPS-LR-L-62

This library reference documents the development of test-year volume, characteristics, and costs of processing Undeliverable-As-Addressed mail (UAA) mail. This is a Category 2 library reference sponsored by witness Cutting (USPS-T-26).

Data Files
05/01/2006
Z4 Info File Layout

This data file presents a table of codes for primary and secondary numbers to describe Z4Info files.

Data Files
Labeling List File *Moved*

Please note that this file has been moved to https://postalpro.usps.com/operations/labeling-lists/changes-september-2025. We apologize for the inconvenience. 

Data Files
Address Matching System (AMS) Congressional Table

This document lists congressional district codes for the AMS database.

Data Files
Address Information System (AIS) ZIP Code™ Record Description

File layout for AISUADDR.txt and AISUZIPS.txt.

Data Files
PTR Error/ Warning Messages

This document provides information on the Product Tracking System Error and Warning Messages.

Data Files
Service Hubs and Facilities Locations

This document provides a list of service hub facilities, includes area, district, NASS, site, locale key, and start date.

Data Files
Sample ZIP + 4® File TXT

This document provides a sample of a ZIP + 4 .txt file.