First Class Postcard
Do not exceed 4-1/4 x 6. Any larger takes the piece into letter category. Minimum thickness .007 inch (if no more than 4-1/4" high and 6" long); .009 inch (if more than 4-1/4" high or 6" long or both). Maximum thickness .016 inch.
Postcards mail First-Class as do letters. But postcards cost only 24¢ or less, vs. 39¢ for letters (Single Piece Rate). Use them for reminders, announcements or any quick message that can be conveyed in a small amount of space.
A double postcard (two attached postcards) also qualifies for the postcard rate, as long as one of the cards is a mail-back reply device for your recipient.

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Postcard
First-Class 29¢
Presorted .245¢;
Automation Mixed AADC .230 ¢
Automation AADC .220 ¢;
Automation 3-digit 218 ¢
Automation 5-digit .205¢
Click here to download Dimensional Standards Template in pdf format. You will need Adobe Acrobat Reader.
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