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Mailpiece Dimensions

The Postal Service classifies the shape of your mailpiece by its dimensions.

Postcards Dimensions
Length: 5-6 inches
Height: 3½ - 4¼ inches
Maximum thickness: 0.016 inch

Letters Dimensions
Length: 5 - 11½ inches
Height: 3½ - 6⅛
Thickness: 0.007 - ¼ inch

Flats Dimensions
Length: 11½ - 15 inches
Height: 6⅛ - 12 inches
Thickness: ¼ - ¾ inches

900 Wood Road · P.O. Box 2000 · Kenosha, WI 53141-2000 P 262-595-2345

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