How much postage to mail a 5x7 postcard?

As of my last update, mailing a 5x7 postcard within the United States typically requires a standard postcard stamp, which costs 48 cents. However, rates can vary based on the destination, weight, and any additional services like tracking. It's always a good idea to check the current postage rates on the official USPS website or at a local post office for the most accurate information.