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Last modified:
February 25th 2005

Mail Services: Mail Piece Design


Size Standards for Automated Handling

 

Sizes & Types: The size of the envelope should properly accomodate the contents.

Post Cards

Minimum size  
Length: 5 inches
Height: 3½ inches
Thickness: .007 inches
Maximum size  
Length: 6 inches
Height: 4½ inches
Thickness: .0095 inches

Letters

Minimum size  
Length: 5 inches
Height: 3½ inches
Thickness: .007 inches
Maximum size  
Length: 11½ inches
Height: 6 1/8 inches
Thickness: .0095 inches

Flats (Larger than letter size)

Minimum size  
Length: over 11½ inches
Height: over 6 1/8 inches
Thickness: over ¼ inch
Maximum size  
Length: 15 inches
Height: 12 inches
Thickness: ¾ inches
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