As of Jan. 26, 2014, U.S. Postal Service stamps for first class letters weighing up to 1 ounce increased from 46 cents to 49 cents in the United States. Each additional ounce for a regular piece of mail adds 21 cents to the postage.
The fee for a flat large envelope up to 1 ounce went from 92 cents to 98 cents as of the Jan. 26, 2014, changes. The USPS introduced a new metered mail rate for companies that use postage meters. The rate was set at 48 cents. The rate for regular postcards increased from 33 cents to 34 cents.