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Sizes for Letters
To be eligible for mailing at the postage rates for letters, a piece must be:
Rectangular
At least 3-½ inches high x 5 inches long x .007 inch thick.
No more than 6-1/8 inches high x 11-½ inches long x 1/4 inch thick.
Many mailers fold sheets of paper to form letter-size pieces or newsletters. Folded pieces can save time and money because you’re not paying for or stuffing envelopes. We recommend that you use wafer seals or tabs to close the open sides of folded mailpieces. Here’s some good advice on tabbing: Put the fold on the bottom (the side below the address) and secure the top flap with a piece of tape or a round seal.
Sizes for Large Envelopes and Flats
Have one dimension that is greater than 6-1/8 inches high OR 11-½ inches long OR ¼ inch thick.
Be no more than 12 inches high x 15 inches long x ¾ inch thick.
Cards (or postcards) are an inexpensive way to get an immediate message to customers. When cards arrive in the mail, there’s the message -- no envelope to open! First-Class cards are a great value, too. With First-Class cards, you pay a low rate and get all of the benefits, like forwarding and return, that come with First-Class Mail. You may think that your mailpiece is a "card," because it is a single sheet of paper. But to qualify for mailing at First-Class Mail card rates, a card must be:
If your mailpiece does not meet the dimensions above, then the Postal Service considers it a letter (and charges letter rate postage). With Standard Mail, there is a little more flexibility -- there is no separate (lower) postage rate for cards, so you don't have to worry about your postcard being too big -- because you're paying letter rates anyway. But make sure that your card is no larger than 6-1/8" x 11-1/2" x 1/4" thick. Larger than any of those dimensions and you'll have to pay flat (nonletter) postage rates.
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