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| Postal Specifications Chart |
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MIN |
MAX |
| First Class Post Cards |
| Height |
3.5" |
4.25" |
| Length |
5" |
6" |
| Thickness |
.007" |
.016" |
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| Letters (all classes) |
| Height |
3.5" |
6.125" |
| Length |
5" |
11.5" |
| Thickness |
.009" |
.25" |
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| 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 ration 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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Neither DirectMailQuotes LLC nor the U.S. Postal Service is responsible for the accuracy of this information.
For the most up-to-date information available, go to the U.S. Postal Service website at www.usps.com.
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