What is Postage for a Postcard?

You can use one stamp to mail a postcard within the United States. Specifically, to mail a post card within the United States via First-Class mail on USPS, it would cost $0.28. To mail a post card that is large(11 1/2 inches long by 6/18 inches high and by 1/4 inch thick) via First-Class Mail on USPS, it would cost $0.44. For more information look here: