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What size is a postcard?

The most commonly mailed postcard size is approximately 4″ x 6″.

The Universal Postal Union (UPU) has given the following minimum and maximum sizes for postcards:

  • Minimum: 140 x 90 mm OR 5.51 x 3.54 in
  • Maximum: 35 x 120 mm OR 9.25 x 4.72 in