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| First Class & First Class Presort -
Delivery 1-3 days 13 ounces or less, 500 or more pieces per mailing , requires Proof of Address Update forms | |
| Standard Mail
- Delivery 2-9 days less than 16 ounces, 200 or more pieces per mailing or 50 pounds or more per mailing | |
| Non-Profit Mail - Delivery 2-9 days* less than 16 ounces, 200 or more pieces per mailing or 50 pounds or more per mailing, USPS Non-Profit Permit | |
| Periodicals - Delivery 1-7 days* 1 or more pieces per mailing, highly detailed content restrictions, Prior authorization by USPS |
* Except Alaska and Hawaii
Postcards:![]() minimum maximum length** 5 inches 6 inches height 3-1/2 inches 4-1/4 inches thickness 0.007 inch 0.016 inch Aspect Ratio: between 1.3 and 2.5 | |
Letters (including self-mailers and over-size
postcards):![]() minimum maximum length** 5 inches 11-1/2 inches height 3-1/2 inches 6-1/8 inches thickness 0.007 inch 1/4 inch Aspect Ratio: between 1.3 and 2.5 | |
Flats![]() minimum maximum length** 11-1/2 inches 15 inches height 6-1/8 inches 12 inches thickness 1/4 inch 3/4 inch Aspect Ratio: between 1.3 and 2.5 | |
| Periodicals - require prior
authorization by USPS Typical Periodicals are newspapers, magazines, and newsletters | |
Parcels![]() Length = longest side of the parcel Girth = measurement around the thickest part of parcel length + girth length + girth cannot exceed 108 inches (Parcel Post cannot exceed 130 inches) |
Aspect Ratio
Aspect Ratio = length divided by height**
Aspect Ratio determines if a piece is machinable (lower postage rates)
A machinable piece must have an Aspect Ratio between 1.3 and 2.5
i.e. Envelope 4 1/8" x 9.5"
9.5 divided by 4.125 =
2.303
Machinable
Envelope 4" x 5"
5 divided by 4 =
1.25
Non-Machinable
** length is the dimension parallel to the address
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