Summary
To address a postcard in the USA, the address should be placed on the right hand side of the postcard and midway down the card.
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It is recommended to use a $0.48 postcard stamp for standard-sized postcards.
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Envelopes must be rectangular and made of paper to qualify for letter prices, while postcards are for short messages that don't need to be put in an envelope.
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According to
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Summary
Sending mail with USPS is easy and can be done domestically, including U.S. territories and military bases. Envelopes must be rectangular and made of paper to qualify for letter prices, while postcards are for short messages that don't need to be put in an envelope. To save money, it is recommended to use a $0.48 postcard stamp for standard-sized postcards.
How to Send a Letter or Postcard | USPS
usps.com
If you’re sending mail to a US address from an international location, don’t forget to list the US as the final line in your address. A few more tips. According…
How to Write a US Address – campusSIMS
campussims.com