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Dimensional Standards

Mail Piece Dimensions

Letters

Size Limits:

  • Rectangular; length is the dimension parallel to the address with aspect ratio between 1.3 and 2.5. Length divided by height.

  • At least 3.5 inches high by 5 inches long by .007 inch thick

  • No more than 6-1/8 inches high by 11-1/2 inches long by 1/4 inch thick

  • Up to 3.5 ounces

  • Surcharge will apply for non-machinable letters. Currently, $0.20 per piece.

Flats

Size Limits:

  • Rectangular

  • No more than 12 inches high by 15 inches long by .75 inch thick

  • Must not be rigid and must be uniformly thick.

Parcels

Size Limits:

  • No more than 108 inches in combined length and girth.

Postcards

Size Limits: Single thickness cannot be folded

  • Minimum: 3-1/2 inches high by 5 inches long by 0.007 inch thick

  • Maximum: 4-1/4 inches high by 6 inches long by 0.016 inch thick

  • Additional postage is required by the USPS for larger postcards. Contact Postal Services for current piece rate.

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by wielgn82 last modified Jun 23, 2011 01:56 PM
Contact Information

Postal Services

650 Witzel Avenue
Oshkosh, WI 54901

Ph. (920) 424-1145
postalserv@uwosh.edu

Hours: M - F 7:45A - 4:30P