Mail dimensions by class
You Have Options in Applying Postage to Your Mail Leaving NPC.
| Shape | Length | Flat | Package |
|---|---|---|---|
| Postcard | 5-inch min. 6-inch max. |
3 1/2 inch min. 4 1/4 inch max. |
|
| Letter | 5-inch min. 11 1/2 inch max. |
3 1/2 inch min. 6 1/8 inch max. |
.007 min. 1/4 inch max. |
| Flat | 6 1/8-inch min. 12-inch max. |
11 1/2 inch min. 15 inch max. |
1/4 inch min. 3/4 inch max. |
| Package | Length + thickness cannot exceed 108 inches (130 inches for Parcel Post) | ||
Other limitations can apply. Please check with the USPS or NPC for further clarification.
