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| LETTER SIZE STANDARD DIMENSIONS | LETTERS | POSTCARDS |
| Minimum Size Maximum Size Minimum Thickness Maximum Thickness |
3 1/2" x 5" 6 1/8" x 11 1/2" 0.007" 1/4" |
3 1/2" x 5" 4 1/4" x 6" 0.007" 0.0095" |
Following are the guidelines which adhere to the new USPS standards for Automated Mailing. Folded Self-Mailers: A folded self-mailer must be prepared with the folded edge parallel to the longest dimension AND the address of the mail piece. The mailing panel must consist of only the address, return address and the indicia. Avoid lines and artwork that may interfere with the automated mailing machines. |
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8.5" x 11" or 8.5" x 14" Half Fold 28# / 70# Paper |
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8.5" x 11" Letter Fold 24# / 60# Paper Multiple Sheets 32# / 70# Paper Single Sheets |
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8.5" x 14" Double Parallel Fold 32# / 70# Paper |
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11" x 17" Double Fold 24# / 60# Paper |
We can assist you in designing Business Reply postcards to meet Post Office requirements.

Bar-coding is available on a variety of mail pieces including envelopes, postcards, and newsletters.
