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A Guide to Standard Postcard Sizes for Mailing

When it comes to postcard printing, size does matter. Postcards are a popular direct mail tool. To best make use of USPS rates, they have to meet certain requirements, one of which is size. Here are the most common postcard size questions.

What are the standard postcard sizes available?

Standard Postcard Sizes
Standard flat postcards come in the following sizes: 4.25” x 5.5”, 4” x 6”, 4.25” x 6”, 5” x 7”, 6” x 8”, 5.5” x 8.5”, 4” x 9”, 6” x 9”, and 6” x 11”. Folded postcards are also available in half fold and trifold variants.

Half-Fold Postcard
Half Fold Postcard

Tri Fold Postcard
Tri Fold Postcard

Which postcard sizes are mailable?

All of the above stated postcard sizes are mailable. However, different sizes qualify for different USPS rates.

  • Postcards sized 4 x 6 inches are eligible to mail at the USPS’s First Class Postcard Rate.
  • Postcards sized 5 x 7 – 6 x 11  may qualify for the USPS’s Standard Letter Rate or First Class Letter Rate

What are the Every Door Direct Mail® (EDDM®) postcard sizes?

USPS Approved EDDM Postcard Size

USPS-approved EDDM® sizes for postcards, include: 8.5” x 7”, 6.25” x 9”, 4.25” x 11”, 6.25” x 11”, 8.5” x 11”, 6” x 12”.

What if my postcards don’t meet USPS mailing requirements? Can they still be mailed?

In addition to size regulations, your design must follow other basic USPS requirements if you want them to be mailable without an envelope. If you wish to order a design that may not necessarily follow other USPS requirements, you could order custom envelopes for your postcards.

Are there templates to help create postcards to USPS requirements?

Yes. Our postcard templates will indicate where specific mailing information should be placed. Templates will also indicate safe zones, trim lines, bleeds, and borders. Feel free to download any of our templates below.

Here's what the templates look like with an explanation of each zones:
Postcard Front

Postcard Back

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