What size postcard can be mailed

According to the United States Postal Service (USPS), the maximum size for a postcard that can be mailed is:

• Length: 3.5 inches (8.9 cm)
• Width: 5 inches (12.7 cm)
• Thickness: 0.007 inch (0.18 mm)

Additionally, the USPS has specific guidelines for the size and shape of postcards:

• The postcard must be rectangular in shape, with a maximum aspect ratio of 1.3:1 (width:length).
• The postcard must have a minimum of 0.007 inch (0.18 mm) of clearance around the edges to ensure that the card can be easily processed through automated machinery.

It's worth noting that while these are the maximum dimensions for a postcard, it's still important to check with your local post office or the USPS website for any specific regulations or restrictions that may apply in your area.

In general, most postcards are designed to be smaller than these maximum dimensions, typically measuring around 3.5 x 5 inches (8.9 x 12.7 cm). This size is often considered the standard for postcards and is widely accepted by the USPS.