USPS Postcard Size To qualify as a postcard, a mail piece must be rectangular and meet these dimensions: At least 3-1/2” high X 5” long X 0.007” thick. No more than 4-1/4” high X 6” long X 0.016” thick.Jun 14, 2018
Is 4x6 a standard postcard size?
Those standard postcard sizes are: 4x6," 4.25x5. 5," 4.25x6," 5x7," 5.5x8. 5," 6x9," and 11x6."Oct 28, 2019
What size is a standard postcard UK?
Although the general consensus is that the dimensions of an international standard postcard are A6 size, 148 x 105 mm or 5.8 x 4.1 inches, the Universal Postal Union (UPU) has defined postcards as having the following maximum and minimum sizes for their members.
Can you mail any size card?
To be eligible for mailing at the price for letters, a piece must be: Rectangular. At least 3-1/2 inches high x 5 inches long x 0.007 inch thick. No more than 6-1/8 inches high x 11-1/2 inches long x 1/4 inch thick.