* Use the official name of the recipient, including any titles or degrees.
* Include the street address, city, state, and zip code.
* For military mail, use the following format:
```
RANK RECIPIENT NAME
UNIT NAME
APO AE ADDRESS
PSC BOX ###
GUAM ZIP CODE
```
2. Affix the proper postage.
* The postage rate for a letter to Guam is the same as the postage rate for a letter to any other U.S. state or territory.
* You can purchase postage stamps online, at the post office, or at a self-service kiosk.
3. Mail the letter.
* You can mail the letter at any U.S. Post Office.
* The letter will be delivered to Guam by the U.S. Postal Service.
Here are some additional tips for sending a letter to Guam:
* Use a clear and concise font.
* Avoid using abbreviations or slang.
* Be sure to proofread your letter for errors before mailing it.
* Include a return address in case the letter is undeliverable.