Postcard mail size

A postcard is a type of mail that is designed to be a small, flat piece of paper that can be mailed at a lower rate than a standard letter. The standard size for a postcard in the United States is:

• Length: 3.5 inches (89 mm)
• Width: 5 inches (127 mm)
• Thickness: 0.007 inch (0.18 mm)

This size is specified by the United States Postal Service (USPS) and is commonly referred to as a "standard postcard size." However, it's worth noting that postcards can come in a variety of sizes, and some may be larger or smaller than the standard size.

Here are some other common sizes for postcards:

• A6 postcard: 4.13 inches (105 mm) x 6.04 inches (153 mm)
• A7 postcard: 5.83 inches (148 mm) x 8.27 inches (210 mm)
• Square postcard: 4 inches (102 mm) x 4 inches (102 mm)

It's also worth noting that some postcards may have a special size or shape, such as a panoramic postcard or a postcard with a unique shape or design.