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How Much Does It Cost to Mail a Letter?

Postage Rates for Domestic Letters and Envelopes The cost of mailing a letter or envelope within the United States depends on several factors, including the weight, size, shape, and delivery speed. As of 2021, the basic postage rate for a standard-size letter (up to 1 ounce) is $0.58. Additional ounces cost $0.20 each, and a typical letter weighing 2 ounces…