Mailing Guidelines

What Are You Mailing? Domestic

Knowing the shape of your mail determines the price you will pay.

This picture shows a postcard. This picture shows a letter. This picture shows a large envelope. This picture shows a package.
Postcards
Maximum thickness 0.016 inch
Letters
Maximum thickness 1/4 inch
Large Envelopes
Maximum thickness 3/4 inch
Packages
Maximum length plus girth 108 inches (130 inches for Parcel Post)

Mailpiece Dimensions

SHAPE LENGTH HEIGHT
Postcards minimum
maximum
5 inch min.
6 inch max.
3-1/2 inch min.
4-1/4 inch max.
Letters minimum
maximum
5 inch min.
11-1/2 inch max.
3-1/2 inch min.
6-1/8 inch max.
Large Envelopes minimum
maximum
11-1/2 inch min.
15 inches
6-1/8 inch min.
12 inches
Packages Maximum length plus girth 108 inches (130 inches for Parcel Post)