Welcome, Sharing some info on mail in all of USA. getting ready for our ATC exchange.
Sizes for Letters
You probably have a picture in your mind of what a "letter" is. Possibly you're using a standard No. 10 envelope for your letter, so that's easy to picture. However, if you decide to create a mailpiece with its own special envelope or if you are designing a piece that will be folded to letter-size, be sure to keep in mind the following size requirements for letters:
Dimension | Minimum | Maximum |
---|---|---|
Height | 3-1/2 inches | 6-1/8 inches |
Length | 5 inches | 11-1/2 inches |
Thickness | 0.007 inch | 1/4 inch |
To be eligible for mailing at the price for letters, a piece must be:
- Rectangular
- At least 3-1/2 inches high x 5 inches long x 0.007 inch thick.
- No more than 6-1/8 inches high x 11-1/2 inches long x 1/4 inch thick.
First-Class Mail letters that have one or more nonmachinable characteristics will pay a nonmachinable surcharge. Customers can be unpleasantly surprised that they must pay extra postage when, for example, they mail a square greeting card. The Postal Service charges extra postage because mailpieces that are rigid, square, or unusually shaped, often jam postal equipment and are difficult to process. This costs the Postal Service time and money—and may also damage your mailpiece.