An APO/FPO address is a military mailing address that lets you send mail and packages to U.S. service members, diplomats, and their families stationed overseas at the same postage rates you’d pay to ship within the United States. The mail travels through the regular U.S. Postal Service until it reaches a military mail terminal, where military transportation carries it the rest of the way to the base or ship. To use the system correctly, you need to format the address a specific way, ship through USPS, and fill out a customs form for almost everything except plain letters.
What APO, FPO, and DPO Stand For
APO means Army or Air Force Post Office. FPO means Fleet Post Office, which handles mail for Navy vessels and Marine Corps units. DPO stands for Diplomatic Post Office and covers U.S. diplomatic personnel abroad.1Department of the Air Force. DoD Instruction 4525.09 – Military Postal Service All three are part of the Military Postal Service, a joint operation of the Department of Defense and USPS that runs in more than 55 countries.2U.S. Army Human Resources Command. Military Postal Service Agency (MPSA)
From a sender’s point of view, all three work the same way. You address the package as if it’s going to a domestic U.S. location, hand it to USPS, and the military system handles the overseas leg.
How to Format an APO/FPO Address
An APO/FPO/DPO address looks like a standard U.S. address, but the city and state lines get replaced with military codes. The “city” line reads APO, FPO, or DPO. The “state” line uses one of three two-letter codes:3United States Postal Service. Publication 28 – Postal Addressing Standards – Section 225 Military Addresses
- AA: Armed Forces Americas (excluding Canada)
- AE: Armed Forces Europe, the Middle East, Africa, and Canada
- AP: Armed Forces Pacific
A correctly formatted address looks like this:
PFC JOHN DOE
PSC 3 BOX 4120
APO AE 090214USPS. Military and Diplomatic Mail
“PSC” stands for Postal Service Center. You may also see “Unit” followed by a number, which points to a specific military unit. Either one routes the mail once it reaches the overseas facility. The ZIP code works exactly like a domestic ZIP code.
Never include a city, country, or any foreign address information on the label. Writing the host country’s name is one of the most common mistakes senders make, and it can bump the package into that country’s civilian postal system, which causes delays, unexpected customs fees for the recipient, or a lost package.4USPS. Military and Diplomatic Mail
Use USPS Only
You have to ship through the U.S. Postal Service. FedEx, UPS, and other private carriers cannot deliver to military post office boxes.5FedEx. Government Shipping Services A package sent through a private carrier will come back to you as undeliverable, and you’ll still owe the original shipping charges.
This trips people up when ordering online. Many retailers default to UPS or FedEx, so an order with an APO/FPO address may be rejected at checkout or silently routed through a carrier that can’t finish the job. Before placing an order for someone at a military address, confirm the retailer ships via USPS.
Domestic Postage Rates and Free Supplies
The main advantage of the system is price: you pay domestic postage rates for mail going to APO/FPO/DPO addresses, even though it ends up overseas.4USPS. Military and Diplomatic Mail Priority Mail, First-Class Mail, and Priority Mail Express all work.
USPS also sells a Priority Mail Flat Rate Box specifically for military addresses, priced slightly lower than the standard flat rate box.6Postal Explorer (USPS). January 2026 Price Change – Notice 123 Priority Mail shipments include $100 of insurance at no extra cost. Better yet, USPS will ship you free Priority Mail APO/FPO Flat Rate Boxes and a free Military Care Kit (six boxes, tape, and labels) through the Postal Store website.7USPS Store. Priority Mail Flat Rate APO/FPO Box Order them before you start packing so you know your dimensions.
One direction limitation: USPS Ground Advantage is available for shipping from APO/FPO locations back to the United States, but not for sending packages out to those addresses.4USPS. Military and Diplomatic Mail
Customs Forms
Almost every package sent to an APO/FPO/DPO address needs a customs form. The narrow exception is First-Class Mail International letters and large envelopes under 15.994 ounces that contain only documents or correspondence.8USPS. Customs Forms Everything else, including a small gift, needs customs paperwork.
The old hand-filled preprinted customs forms (PS Form 2976, 2976-A, and 2976-B) are obsolete and no longer accepted. You have two ways to complete the paperwork now:9United States Postal Service. International Mail Manual – Section 123 Customs Forms and Online Shipping Labels
- Online through Click-N-Ship or USPS-approved vendor software, which generates an electronic customs form and shipping label at home.
- At a Post Office counter using PS Form 2976-R, a paper worksheet. The clerk enters your information into the system and prints the official electronic label. The 2976-R worksheet itself isn’t a standalone customs form.
On the form you’ll list your name and address, the recipient’s full military address, and a description of every item in the package with its declared value in U.S. dollars and its weight.8USPS. Customs Forms Descriptions need to be specific: “cotton t-shirt” or “chocolate chip cookies,” not “clothing” or “food.” Vague entries can hold a package up at inspection.
What You Can’t Send
Content rules for military mail are tighter than regular domestic shipping because packages fly on military aircraft and also have to satisfy the host country’s import rules. Common restricted or prohibited items include:
- Alcohol. Beer, wine, and liquor are generally prohibited in the mail, and many alcohol-based products such as hand sanitizer count as hazardous materials.10USPS. Shipping Restrictions and HAZMAT – What Can You Send in the Mail
- Aerosols. Pressurized containers like hairspray and spray deodorant fall under hazardous materials rules. Some are mailable domestically with restrictions, but the air transport requirements for military mail make most impractical to send.
- Ammunition and explosives. Completely prohibited.
- Perishable food. Fresh fruit, vegetables, and anything that can spoil are nonmailable. Shelf-stable snacks, canned goods, and sealed dry foods are generally fine.11Postal Explorer. Publication 52 – Hazardous, Restricted, and Perishable Mail – Section 53 Fresh Foods and Other Perishables
Lithium Battery Rules
Electronics are popular care package items, but lithium batteries come with strict conditions. Lithium-ion batteries can only be shipped to APO/FPO/DPO addresses when they’re properly installed in the device they power. Loose batteries or batteries packed separately alongside a device are prohibited.12Postal Explorer. USPS Packaging Instruction 9E – Lithium Metal and Lithium-ion Cells and Batteries – International and APO/FPO/DPO Each shipment is limited to four lithium-ion cells or two lithium-ion batteries, with each cell rated at no more than 20 watt-hours and each battery at no more than 100 watt-hours. The device has to be cushioned inside rigid outer packaging, with the battery installed and the device turned off.
Size and Weight Limits
Standard USPS domestic packages can weigh up to 70 pounds with a combined length and girth of up to 130 inches. APO/FPO/DPO destinations may have tighter dimensional restrictions, with some locations capping packages at 14 inches wide by 14 inches tall.13USPS FAQ. What Are the Specific Restrictions for Military Mail Oversized packages can be returned. Check the specific restrictions for your recipient’s ZIP code before shipping anything large.
How Long Delivery Takes
Priority Mail is the most common choice for military packages. USPS publishes these estimated windows:14USPS FAQ. Military and Diplomatic Mail
- AE ZIPs 090–092 and 094–099 (Europe and Atlantic): 7 to 9 days
- AE ZIP 093 (Middle East): 7 to 13 days
- AP ZIPs 962–966 (Japan, Korea, Pacific): 7 to 9 days
- AP ZIP 340 (Central and South America, Caribbean): 7 to 9 days
These are estimates, not guarantees. During major deployments or holiday surges, transit times stretch. First-Class Mail typically takes longer than Priority Mail, though USPS doesn’t publish specific First-Class timelines for military destinations. When timing matters, Priority Mail or Priority Mail Express is worth the extra cost.
Tracking, Insurance, and Lost Packages
Tracking works normally while the package is in the domestic USPS system. Once it transfers to military transportation, updates often stop or become sporadic. A customs declaration number by itself won’t let you track the package; you need tracking through a paid service like Registered Mail or insurance.15USPS. Publication 640 – Military Mail FAQ Since Priority Mail includes tracking and $100 of insurance built in, it’s the practical default for anything you’d hate to lose.
If a package is lost or damaged, you can file an indemnity claim with USPS. The filing windows depend on the class of mail:16United States Postal Service. DMM 609 – Filing Indemnity Claims for Loss or Damage
- Priority Mail Express Military Service: no sooner than 21 days and no later than 180 days from mailing.
- Insured Mail (Priority Mail, First-Class, USPS Ground Advantage): no sooner than 45 days and no later than one year from mailing.
- Surface-only insured mail: no sooner than 75 days and no later than one year.
File claims online at usps.com or by mailing a completed PS Form 1000. Hold onto your receipt, proof of value, and proof of insurance until the claim resolves. If the package arrived damaged, the recipient should keep all packaging and damaged contents, because USPS may ask to inspect them.
Holiday Shipping Deadlines
USPS publishes recommended holiday mailing deadlines each year, and the cutoffs for military addresses are earlier than domestic deadlines because of the extra time through military channels.17USPS. USPS Recommends 2025 Holiday Mailing and Shipping Dates Specific dates change year to year. Check the USPS website in early fall and build in a cushion. For a holiday care package by Priority Mail, aim for late November to early December rather than waiting for the last recommended date. Military mail volume surges heavily during the holidays, and the published deadlines assume everything runs smoothly.