How to Mail a Letter to Guam: Address, Postage & Tips
Guam is a U.S. territory — domestic postage rates apply. No customs form needed. Here's the foolproof method:
1. Address Format
RECIPIENT NAME
STREET ADDRESS / PO BOX
CITY, GU 969XX
UNITED STATES
Military (APO/FPO):
RANK FULL NAME
UNIT NUMBER / PSC BOX ###
APO AP 965XX (or APO AE for Europe/Middle East)
UNITED STATES
2. Postage (2024 Rates)
- Forever Stamp (1 oz): $0.68 — same as any U.S. domestic letter.
- Additional ounces: $0.24 each.
- Postcard: $0.53.
- Tracking/Insurance: Add Certified Mail ($4.40), Registered Mail ($26.95+), or Priority Mail ($9.65+).
3. Drop Off
- Any USPS post office, lobby drop, blue collection box, or scheduled pickup.
- Transit: 7–14 days First-Class; 3–5 days Priority Mail.
Pro Tips
- Use ZIP+4 (96913-XXXX, 96921-XXXX, etc.) for speed.
- Include return address (upper left).
- No "International" markings — confuses sorters.
- For packages: USPS Flat Rate boxes ship to Guam at domestic rates — huge savings vs. UPS/FedEx.
Guam uses USPS exclusively for mail. DHL/FedEx/UPS deliver parcels but at international rates. Stick with USPS for letters.
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