INFORMATIONAL - USPS APIs System Maintenance April 15 Release

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. 

March 29 2026 PostalOne! Release Notes

PTR2 Release Notes_DD_03_27_26

PTR2 Release Notes_DD_03_29_26

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.

PCC Voice Challenge #PCCRepost

INFORMATIONAL - FAST Appointment Update (03.29.2026)

DELIVERY - Diplomatic Post Office (DPO) 09892 - Resume Mailing Services

Beyond the Mail

Turn USPS’s unmatched doorstep reach into smarter decisions with Beyond the Mail—powered by USPS Post Office and Collection Box Data, USPS Occupancy Trends, and USPS Population Mobility Trends for sharper planning across real estate, retail, logistics, and more.