What is the maximum height of a postcard?

The maximum height of a postcard is set at 4 1/4 inches. This standard is established by USPS guidelines to classify postcards and ensure they can be processed efficiently within their mailing systems.

Postcards must adhere to specific size requirements to qualify for the postcard rate. If a postcard exceeds these dimensions, it may not be classified as a postcard and could incur different rates, as well as potential handling challenges. Therefore, understanding the specifications of postcard sizes is crucial for both mailing efficiency and cost-effectiveness.

Other size options, while they may represent measurements for other mailing types or categories, do not meet the criteria established for postcards specifically, leading to their classification as non-postcard mail.