U.S. additional-ounce, postcard rates to go up in 2021

The U.S. Postal Service will keep the price of a domestic first-class letter at 55¢ in 2021.But to do that, it will boost the price for each additional ounce on heavier letters to 20¢, a 5¢ increase from the current 15¢ rate.

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USPS RATE HIKE JANUARY 22, 2023 – Official Mail Guide (OMG)

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US Postal Service rate increases takes effect Sunday