Postal Info

There are three classes of mail:

  • First-Class - Personal mail, including letters and postcards
  • Standard - Advertising or not of a personal nature
  • Periodical - Magazines, newspapers, etc.

There are four types of mail:

  • Postcard
  • Letter
  • Flat (or large envelope)
  • Parcel
  Minimum Maximum
Length 5 inches 6 inches
Height 3.5 inches 4.25 inches
Thickness .007 inch .016 inch
  Minimum Maximum
Length 5 inches 11.5 inches
Height 3.5 inches 6.125 inches
Thickness .007 inch .25 inch
Letters that meet one or more of the nonmachinable characteristics in DMM 101.1.2 are also subject to the $0.20 nonmachinable surcharge.
  Minimum* Maximum
Length 11.5 inches 15 inches
Height 6.125 inches 12 inches
Thickness .25 inch .75 inch
* Flats exceed at least one of these dimensions. Pieces that are rigid, nonrectangular, or not uniformly thick pay package prices.
Length + Girth

Length + Girth combined cannot exceed 108 inches (Parcel Post cannot exceed 130 inches.)


The longest side of the package


Measurement around the thickest part (perpendicular to the length.)

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