How much to mail a postcard in the us 2015

According to the United States Postal Service (USPS), the cost to mail a postcard in the US in 2015 was:

• First-Class Mail Postcard: $0.33 (as of May 12, 2015)

This rate applied to postcards weighing up to 3.5 ounces and measuring up to 4.5 inches long, 6.125 inches high, and 0.016 inches thick.

Please note that postal rates are subject to change, so it's always a good idea to check the current rates on the USPS website or at your local post office.