Postage Rates 2024 Per Ounce Chart. On january 21 st, 2024, the usps ® will be adjusting rates for both market dominant and competitive products. Explore the usps postage rate shifts for postcards, flats, and letter sizes in 2024, and optimize.
New usps ® rates approved for july 14, 2024 the usps mailing services price changes will take effect july 14, 2024. Usps® rolled out new mailing rate changes, fees, and other significant shifts this july.