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.
Our Guide to the 2023 USPS® Rate Change
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History of United States postage rates - Wikipedia
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Price of stamps and postcards goes up, again
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