Probably the same - if you are in the usa just use a stamp like you would to use for a letter. You could do that, but in march of 2009, it only cost 27 cents to mail a postcard. Why pay almost double when you don't need to?
the current price of a stamp is 44 cents. First-Class Mail Letter (1 oz.) is 44 cents. Each additional ounce costs 17 cents. Postcard stamps are now 28 cents.
USPS.com says it costs 98 cents to send a postcard from the US to Australia.
The current postage rate is 45 cents for a standard First Class letter.
If its US domestic and a standard letter it costs 59 cents First Class. If the item is rigid or in an odd sized envelope it costs 79 cents First Class. You can calculate your postage at http://postcalc.usps.gov/.
As of 27 Jun 2008, a standard, letter-sized envelope or postcard weighing 1 ounce or less costs 72 cents to mail to Canada from the United States.There is a 20 cent surcharge for non-machinable envelopes.As of March 2010, a standard letter-sized envelope weighing one ounce or less costs 75 cents.
It depends on the size of your postcard. Since postcard sizes do cost a little more, my recommendation is to print on slightly smaller postcards (or just snip an eighth of an inch off the ends of yours.)
It costs 94 cents to mail a letter weighing no more than one ounce to France or almost anywhere else in the world. It now costs 98 cents.
42 cents HOWEVER on May 11th, 2009 it will be raised to 44 cents
U.S. Postage costs forty four cents to send a first class letter. This was recently raised from last year's price of forty two cents.
After filling out the price calculator on the USPS website, I got 94 cents for a normal letter (under 1 ounce) to China.
It costs the same to send a letter anywhere in the US to anywhere in the US. The current price of a first class stamp is 42 cents. So, it will cost you 42 cents from California to Iowa.
A one-ounce simple letter, first class, between any two locations in the USA, costs 45 cents as of January 22, 2012.