Still, after all the doom and gloom and constant threats from Presidents and members of Congress, the United States Postal Service soldiers on. We never seem to hear about the United States Postal Service unless there is bad news to report. When Was The Last Postal Service Rate Increase? U.S. Postmaster General Stuns Customers With Postal Rate AnnouncementMaybe that's why the United States Postal Service has just revealed this nugget of news for 2026. Over the past five years, first-class mail and marketing mail prices have risen more than 50%, while periodical prices have grown by 67%.