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Click here to view the access the Office of the Inspector General’s Report, “The Price of a Stamp” report.

In this white paper, the U.S. Postal Service Office of Inspector General (OIG) reviewed the prices of standard domestic letters — the equivalent to a one-ounce single piece First-Class Mail letter in the United States — offered to retail customers from June 2018 to June 2023 across a sample of 31 countries.