What are the postal service requirements for mailing address space on postcards?

Postal services set aside a clear zone on the address side of a postcard so scanners and carriers can read the delivery details. Crowding that area with artwork is one of the most common reasons a mail piece gets rejected or surcharged, so plan the layout before you finalize your design.

• Keep the lower right portion of the mailing side clear for the address block and barcode
• Leave room for the postage or indicia in the upper right corner
• Include a return address in the upper left
• Avoid heavy patterns or dark backgrounds behind the address so it stays legible

Exact clear space depends on the postcard size and orientation. Standard USPS postcard rules cover pieces from 3.5" x 5" up to 4.25" x 6", while larger pieces mail at letter or flat rates with their own address zone rules. Always check the current USPS mailing standards, or use a supplied mailing template, before sending files to print.