Usps Rates 2024 Large Envelope Price. Changes by usps for postcards, flats & letter size. Usps will adjust mailing services prices, effective sunday, july 14.
Effective september 16, 2024, usps will adjust rates for priority mail ® and ground advantage ™ packages shipped to certain zip codes. Priority mail express flat rate lets you ship packages up to 70 lbs to any state at the same price.