What Are Standard Postcard Sizes by Mail?
- Nsetcon apcw
- Aug 30, 2022
- 2 min read
The USPS defines two standard postcard sizes: 3.5" x 5" and 4.25" x 6". The length of a postcard must be parallel to the address lines, and its height must be perpendicular. A postcard may be either landscape or portrait, but it must have an address on its longest side.

The Standard postcard size is the most versatile postcard size, as it allows the product to be used in any orientation. Postcards larger than this will be categorized as letters. Because they're bigger, these mail products have a better chance of standing out. Those looking to create an oversized postcard, on the other hand, should consider the Jumbo size, which has higher proportions. The jumbo postcard size has a much larger image space, and will require a more vertical or poster-style design.
USPS rates for EDDM postcards are the same as for other postcard sizes, but printing costs will be different. If you're mailing postcards to a specific postal zone, you should use a USPS-affiliated printer or use a mail automation platform such as PostGrid. The fastest option for sending postcards is first-class mail. Using first-class mail, your postcard will arrive locally within 1 to 3 business days, and nationally within three to five days. If you're planning to mail your postcards out to a large area, try a postcard size that fits the postal area.
Besides being a cost-effective print marketing medium, postcards offer you a great opportunity to reach a wide audience. They are more effective than traditional direct mail because recipients don't have to open the envelope or read the letter. By contrast, with direct mail, people are forced to open the letter or envelope and read the message on the back. Postcards, however, allow the recipient to look at the message on the back. This way, they can overcome the rejection that is often associated with direct mail.
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