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FIRST-CLASS MAIL LETTER 2017 POSTAGE RATES 2016 POSTAGE RATES INCREASE/DECREASE. First-Class Mail Letter (1 oz.) - Retail/Post Office Rate $0.49 $0.47 $0.02. Metered Mail (1 oz.) - Online Postage Providers and Postage Meters $0.46 $0.465 -$0.005. First-Class Mail Letter - each additional ounce $0.21 $0.21 NO CHANGE.
The postage rate to mail a 6x8 envelope in the United States as of  2014 is $0.44 if it is within the regulated weight. Additional  costs may occur if it weighs more.ince the envelope is 5.25 X 5.25 inches square, the postage is .70  cents for first class. This rate is for an envelope that weighs .5  ounces. The postage may be higher de â¦ pending on the weight of the  envelope. + 5 others found this useful.