• 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. 

  • Release Notes
    03/29/2026
    Release Notes
    03/27/2026
    Release Notes
    03/27/2026
    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.

    Announcements
    03/26/2026