Postcard Sizes to Consider
Let’s begin with the basics. Most postcards fall under four key sizes:
- 4.25″ x 6″ (Small)
- 6’’ x 9’’ (Standard)
- 6” x 11” (Jumbo)
- 9” x 12” (Extra Large)
Small Postcard 4.25’’ x 6’’
With the least amount of real estate, this postcard is compact and optimal for simple, straight-to-the-point designs. It is also the only size recognized as a traditional “postcard” by the U.S. Postal Service (USPS).
According to the USPS, a postcard measures between 3.5’’ x 5’’ and 4.25’’ x 6,” and anything larger is considered a “letter.” If your size falls into this space, you can utilize First-Class Mail at a lower postage rate than Marketing Mail.
From a postage-cost perspective, First-Class Mail can offer benefits like faster delivery and forwarding or return service if the recipient has moved—ideal for keeping your database up to date.
While it may not stand out like the larger sizes, the Small postcard is often the most economical option and a great fit for high-frequency campaigns.
Standard Postcard 6’’ x 9’’
Standard postcards offer a balance between visibility and cost. This versatile size allows for both horizontal and vertical designs, making it ideal for creative layouts.
Because it’s larger than most envelopes, your message has a greater chance of standing out in the mailbox—without crossing into higher postage rates.
Jumbo Postcard 6’’ x 11’’
One of the largest sizes you can mail at the letter rate, Jumbo postcards provide additional design space while staying cost-effective in terms of postage.
This format is ideal for campaigns that require bold visuals or more content without jumping to the more expensive “flat” rate category.
Extra Large Postcard 9” x 12”
If you want to make a bold impact and budget is less of a concern, the Extra Large postcard offers unmatched visibility. Just keep in mind: postcards over 6.125″ x 11.5″ are classified as “flats” by USPS, which means higher postage rates apply.
However, for major announcements, brand awareness pushes, or standout promotional efforts, this size can be worth the investment.
Considerations for Choosing the Perfect Postcard Size
Here are some practical factors to guide your decision:
Cost-Effectiveness
If your message is simple and budget-conscious, a 4.25″ x 6″ postcard will be the most affordable to print and mail.
Timing
Need your mail to arrive quickly? First-Class Mail is faster than Marketing Mail, and the small postcard qualifies for the best rates.
Space
If your design or message needs more room, go with the 6” x 9” or 6” x 11” sizes. They offer more flexibility while staying within the letter-rate category.
Stand Out
Want to grab attention? The 9” x 12” postcard dominates the mailbox but requires a larger investment.
