Postal Specifications Chart
  MIN MAX
First Class Post Cards
Height
3.5"
4.25"
Length
5"
6"
Thickness
.007"
.016"
Letters (all classes)
Height
3.5"
6.125"
Length
5"
11.5"
Thickness
.009"
.25"
Automation Compatible Flat - Size Mail
Height
6"
12"
Length
6"
15"
Thickness
.009"
.75"

Quick Tips:
  • Mail length is the dimension that parallels the lines of the delivery address.
  • Rectangular shape, with a height-to-length ratio of between 1.3 and 2.5.
  • 100% of the mailing must be delivery point bar-coded to qualify for automated rates.
  • Flats can be either zip + 4 bar-coded or delivery point bar-coded.
  • Minimum thickness for letters measuring 4.24" x 6" or less is .007"
    
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