Stamp Prices Postage stamp prices for first class letters mailed within the domestic United States. Letters Letters no more than 6-1/8 inches high by 11-1/2 inches long by 1/4 inch thick. Up to 3.5 ounces. Price of Postage Stamp Weight not over Price 1 ounce $0.45 2 ounces $0.65 3 ounces $0.85 3.5 ounces $1.05 [...]
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