Announcements
03/31/2026
INFORMATIONAL: Mail Spoken Here March 2026 Issue
Announcements
03/30/2026
INFORMATIONAL - USPS APIs System Maintenance April 15 Release
User Guides
03/30/2026
USPS APIs Terms and Conditions

ACKNOWLEDGEMENT AND ACCEPTANCE. Read this carefully before registering to use the USPS API services. By utilizing the APIs, you hereby ACCEPT ALL of the terms and conditions of this Agreement. 

FAQs
03/30/2026
USPS PTR2 API Known Issues
Data Files
03/30/2026
***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)
Data Files
03/30/2026
City/State ZIP Code Weekly Compare
Data Files
03/30/2026
3 Digit ZIP/AISU Office List (AISUREPT.TXT)
Data Files
03/30/2026
AIS Congressional District File (CONG_DIST.TXT)
Data Files
03/30/2026
AIS County Name Table Layout (AISCNTY.TXT)
Data Files
03/30/2026
AMS County Name Table (COUNTY_NAME_TABLE.TXT)