Sending mail to a deployed service member is a simple but meaningful way to stay connected. Whether you are mailing a letter, a care package, or important personal items, APO and FPO addresses follow a different format than standard U.S. addresses. Getting the details right helps your package move through USPS and the military mail system with fewer delays.
What APO and FPO Mean
Military mail does not use normal city and state information. Instead, it uses special postal designations that route mail through the U.S. Postal Service and into the military postal network.
APO, or Army Post Office, is generally used for Army and Air Force personnel.
FPO, or Fleet Post Office, is used for Navy, Marine Corps, and Coast Guard personnel.
These address types allow mail to reach service members stationed on ships, overseas bases, and military installations around the world.
How to Format an APO or FPO Address
A military address needs to include the recipient, their command or unit, their box information, the APO or FPO designation, the military region, and the ZIP Code.
Start With the Service Member's Name
Use the recipient's full name. Including rank is recommended because it helps identify the correct person.
Examples:
LT Sarah Johnson
LT Johnson, SarahAdd the Ship, Squadron, or Unit
The next line should identify the recipient's assigned command, ship, squadron, or unit. This helps route the mail once it enters the military system.
Examples:
USS America
VAQ-142Include the Unit and Box Number
Military mail usually goes to a unit mailbox rather than a street address. Include the unit number and box number exactly as provided.
Example:
Unit 20541 Box 1187If you do not know the correct box number, it is best to confirm it with the recipient before sending the package.
Use APO or FPO as the City
Where a normal address would list a city, use the correct military postal designation:
APO
FPOThis tells USPS that the mail is going to a military destination.
Use the Correct Military Region Code
Instead of a state abbreviation, military addresses use one of three regional codes:
| Code | Region |
|---|---|
| AE | Armed Forces Europe, Middle East, Africa, and Canada |
| AP | Armed Forces Pacific |
| AA | Armed Forces Americas, excluding Canada |
Include the ZIP Code
Always include the assigned ZIP Code. A ZIP+4 code is preferred because it can help with sorting accuracy and routing speed. If you only have the five-digit ZIP Code, the package can still be delivered, but it may move more slowly.
A complete address may look like this:
MC1 Emily Carter
USS America
Unit 20541 Box 1187
Engineering Department
FPO AP 96349-2145Customs Forms for APO and FPO Packages
Packages sent to APO and FPO addresses often require a customs form, even though the shipment is handled by USPS.
When filling out the customs declaration, be specific about what is inside the package. Avoid vague descriptions like “gifts” or “supplies.” Instead, write clear item descriptions such as:
3 pairs of socks
2 paperback books
1 package of toiletriesYou may also need to include the quantity, estimated value, and weight of each item. Make sure the form is signed and dated before mailing.
Some shipping services that specialize in military mail may complete the customs paperwork for you during checkout.
Which Carriers Ship to APO and FPO Addresses?
USPS is the only carrier that delivers directly to APO and FPO addresses.
Private carriers such as UPS and FedEx cannot complete final delivery to military addresses because those shipments must enter the military postal system. In some cases, private carriers may hand off packages to USPS, but USPS is still responsible for the final military mail delivery process.
Common USPS options include:
| Service | Best For |
|---|---|
| Priority Mail | Faster delivery |
| Parcel Select | Lower-cost shipping when speed is less important |
How Long APO and FPO Delivery Takes
Delivery times can vary widely. Some packages arrive within a few days, while others may take several weeks. A reasonable delivery range is often between 3 and 45 business days, depending on the destination and current military logistics.
Several factors can affect delivery speed, including:
| Factor | How It Can Affect Delivery |
|---|---|
| Military operations | Mail may depend on available aircraft, ships, or convoy schedules |
| Weather | Severe weather can delay transportation and sorting |
| Destination | Remote or overseas locations usually take longer |
| Postal processing | Delays can occur inside USPS or military mail facilities |
| Deployment status | Ships and units may move, which can affect routing |
Final Tips
Shipping to an APO or FPO address is not difficult, but the format matters. Use the service member's full name, include the correct unit and box information, choose APO or FPO as the city, use the right military region code, and ship through USPS.
Before sending a package, double-check the address and complete any required customs form carefully. Taking a few extra minutes at the start can help your mail reach the service member more smoothly, whether they are stationed overseas, aboard a ship, or assigned to a remote installation.