The postage for a postcard is valued at $0.33 as of 2014. This can vary depending on the size of the postcard and may change as the Postal Service changes its rates.
The standard size for a postcard is 4x6" and the biggest size is 6x11". I am not sure if there are postcards smaller than the 4x6".
As of right now (August 2008), postage for a postcard from Quito, Ecuador to the US is $1.56
Currently, 34 cents.
Curry
44 cents
Postage differs depending on where you live.
Currently, 34 cents.
To mail a first class international postcard to Canada, you will need to attach $1.10 in postage. The maximum size for a postcard is 6" in length x 4.25" in height.
postage for a postcard sent from Australia to the U.S. costs AU$1.40.
As of May 2011 any postcard over 4.25"x6" and less than 6.13 x 11.5" is considered regular First Class and is $0.44
As of July 2011, the rate is $0.29.