
See more on addresses in the International Mail Manual.
AIRMAIL STAMP CODE
City, Subdivision (like province, state, county), and Postal Code.Generally, include the following on separate lines: Get specific information about other countries’ postal addresses by going to the Universal Postal Union and clicking "Postal Addressing Systems (PAS)". Many countries use different address formats (for example, the Postal Code might go before the city). You must write the delivery address in English, though you can include the delivery address in another language (like Russian, Greek, Arabic, Hebrew, Japanese, or Chinese), if you write the English translation after each line. Write the delivery address in the bottom center of the envelope. (the “return address”) in the top-left corner. Print addresses neatly in capital letters.Print your return address and the delivery address clearly, in the correct spots, to make sure your mail is delivered on time. Size & Weight Requirements – Postcards & Envelopes to another country costs the same as sending a letter. Sending a regular-sized, rectangular postcard from the U.S. Postcards: Standard postcards are usually made of thick paper (cardstock), are between 5-1/2" to 6" long and 3-1/2" to 4-1/4" high, and are no more than 0.016" thick. If your large envelope is nonrectangular, rigid (can't bend), or lumpy (not uniformly thick), you'll have to pay the package price. If you want to send letter-sized correspondence without folding it, you can use a large envelope (called a 'flat") the postage for international flats starts at $3.00. You’ll also have to pay more if your envelopes are square or vertical (taller than they are wide). ( See additional postage in Step 4.) Nonmachinable items include envelopes that are lumpy or rigid, or have clasps, string, or buttons.

TIP: If your letter can’t fit through USPS ® mail processing equipment, it’s "nonmachinable" and you’ll have to pay $0.40 more to send it. 10 envelope is 9-1/2" long x 4-1/8" high.) You can fold what you put in your envelope, but it needs to stay flat-no more than 1/4" thick. Letter envelopes for international mail can be 11-1/2" long x 6-1/8" high. letters, international letters must be rectangular and made of paper to qualify for letter prices.
