Announcements
03/31/2026
DELIVERY - Southern Area - Puerto Rico District - Moca Post Office (00676) - Suspended
Announcements
03/31/2026
INFORMATIONAL - USPS Package Tracking Access Control Implementation (Effective Wednesday, April 1, 2026)
Announcements
03/31/2026
DELIVERY - Atlantic Area Easton Post Office (18042) - Closed Until Further Notice
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)
Data Files
03/30/2026
AMS Address Report: AISU Mailing List (ADDRREPT.TXT)
Data Files
03/30/2026
AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)
Data Files
03/30/2026
AISU ZIP Code File (AISUZIPS.TXT)
Data Files
03/30/2026
AISU Contact Information (AISUADDR.TXT)
Data Files
03/30/2026
Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)
Data Files
03/30/2026
Area District Finance File (AREADIST.TXT)
Data Files
03/30/2026
Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)
Data Files
03/30/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Release Notes
03/29/2026
March 29 2026 PostalOne! Release Notes
Release Notes
03/27/2026
PTR2 Release Notes_DD_03_27_26
Release Notes
03/27/2026
PTR2 Release Notes_DD_03_29_26
Data Files
03/27/2026
Labeling List Changes Effective May 1, 2026

Effective May 1, 2026, the Postal Service™ will revise Labeling List(s) L007, L012, L014, L016, L051, L201, and L606 to reflect changes in mail processing operations. Mailers are expected to label according to these revised lists for mailings inducted on or after the May 1, 2026, effective date through June 30, 2026, expiration date. The changes will be published in the Postal Bulletin, Issue #22700.