(My theme for April's A to Z blogging challenge is postcards. If you want, read my intro post).
Many people who collect postcards seem to shy away from larger than normal postcards. Most likely, because they are challenging to store. I love big postcards because they are unusual. What is normal, anyway? Generally, 6 x 4 inches, 15 x 10 cm (or a bit less). It depends on the country.
For the USA, it's technically 6 x 4.25 inches because anything over that costs more to mail within the country than standard postcard rate. The beauty is that the postage is the same for an extra-large postcard and a regular sized one when mailing internationally.
On the picture above, you can see some of the largest postcards I have received. The first one on top that depicts scenes from Germany was sent from within the USA, I won it in a Facebook postcard group. It measures about 4.25 x 8.5 inches (approximately 11 x 21.5 cm).
The one in the middle was sent from Taiwan via Postcard United (a postcard exchange site). I have no idea what it depicts because the backside is in Mandarin, and the user did not describe the card in her message. It measures about 5.15 x 7 inches (approximately 13 x 18 cm).
The third one arrived from the country of origin (England). It's was sent via Postcrossing (the largest postcard exchange site in the world). I received it right after I started collecting postcards. It measures about 3.75 x 7.75 inches (approximately 10 x 20 cm).