The United States Postal Service (USPS) will close its retail locations on New Year's Day, January 1, 2026, observing the federal holiday. Mail delivery will not occur on this day. However, local post offices will be open on New Year's Eve, December 31, with mail delivery operating as usual. USPS advises customers to check local branches for specific New Year's Eve hours. Priority Mail service is expected to be delivered on both December 31 and January 1.