What are the size limits for first-class postcards?
All postcards are not created equal, at least in the eyes of the USPS. In order to qualify for the special first-class postcard rate, a card must be rectangular in shape, at least 3.5 inches high x 5 inches long x 0.007 inches thick, and no more than 6 inches high x 9 inches long x 0.016 inches thick. Postcards that do not meet these regulations are treated as normal mail.
So why would you consider a different size for your postcard? For starters, a larger size stands out better in a pile of mail. It also offers added real estate for offers, images, and text about your products and services.
If you're not concerned about meeting the USPS guidelines for postcard rates, you might consider a slightly larger postcard (5 x 7 or 5.5 x 8.5) to take advantage of these added benefits.
These rules are different for the Every Door Direct Mail (EDDM) through the USPS however which allow for larger sizes that fit within their requirements. Let us know how you would like to use the cards and one of our customer service representatives can ensure we provide the exact size you need.