What Are APO/FPO/DPO Military Mailing Addresses?

APO, FPO, and DPO addresses are the mailing addresses used by U.S. military personnel, their families, and diplomatic staff stationed overseas. They look unusual, but they behave like domestic U.S. addresses inside the postal system: you ship through USPS at domestic rates, regardless of where the recipient actually is in the world.

Two things trip up most first-time senders. First, USPS is the only carrier that can deliver to these addresses. Second, the address has to be formatted a specific way, or the package comes back.

What Each Acronym Means

APO (Army Post Office) serves U.S. Army and Air Force personnel stationed overseas.
FPO (Fleet Post Office) serves U.S. Navy, Marine Corps, and Coast Guard personnel, including those aboard ships.
DPO (Diplomatic Post Office) serves U.S. diplomatic personnel and their families at embassies and consulates worldwide.

All three function as domestic U.S. addresses within the postal system. A letter mailed to an APO in Germany is processed and priced the same as a letter mailed to a street address in Ohio.

One boundary worth naming: the military postal system cannot be used for commercial or business purposes. No running an online store through an APO address, no receiving inventory for resale. Violations can bring action under the Uniform Code of Military Justice for service members, or criminal prosecution for civilian employees.¹

Only USPS Can Deliver

FedEx, UPS, and other private carriers cannot deliver to APO, FPO, or DPO addresses. For security reasons, military and diplomatic postal facilities accept mail and packages exclusively from USPS.²

This matters when you’re shopping online. If a retailer ships only through a private carrier, the order won’t reach a military address. Many online checkouts now recognize APO/FPO/DPO formats, but confirm USPS is the shipping method before you place an order.

How to Format the Address

Correct formatting is essential. A misformatted address can be returned to you outright. The address has three lines:

Line 1: The recipient’s full name, with rank or title if applicable (for example, “SGT JOHN SMITH”).
Line 2: The unit or box number, using designations like “UNIT 2340 BOX 132,” “CMR 456,” or “PSC 789 BOX 100.” CMR stands for Community Mail Room; PSC stands for Postal Service Center.
Line 3: The APO, FPO, or DPO designation, followed by a two-letter “state” code and the ZIP code.

The three “state” codes correspond to geographic regions:³

AA: Armed Forces Americas (Central and South America, the Caribbean)
AE: Armed Forces Europe (also covers Canada, Africa, and the Middle East)
AP: Armed Forces Pacific (Asia, the Pacific Islands, and surrounding regions)

A correctly formatted address looks like this:

SGT JOHN SMITH
UNIT 2340 BOX 132
APO AE 09350

Include the nine-digit ZIP+4 whenever the recipient has one. Your return address must be a complete U.S. street address with city, state, and ZIP code.³

Get the ZIP code from the recipient directly. It’s the single most common thing people get wrong, and a wrong ZIP will send the package to the wrong region entirely. If you need to verify one, the USPS ZIP Code Lookup tool includes military designations like “AE – Armed Forces Europe” and “AP – Armed Forces Pacific” in its state dropdown.⁴

One security rule: USPS will not deliver mail addressed to “Any Servicemember.” You need the full name of a specific person.

Available Mail Classes and Cost

Because APO/FPO/DPO addresses are treated as domestic destinations, you pay domestic USPS rates for every shipment.⁵ The main choices are:

Priority Mail Express: The fastest option, with delivery standards that vary by destination.
Priority Mail: The most popular choice for care packages, with estimated delivery of 7 to 13 days depending on the region.
First-Class Mail: Best for letters and lightweight packages.
USPS Ground Advantage: The most affordable option for heavier packages, though transit times can stretch to 30 to 45 days for some destinations.

USPS offers free Priority Mail APO/FPO Large Flat Rate Boxes, which you can order online from The Postal Store and have delivered to your door at no charge.⁵ Flat rate boxes are useful because dimensional weight doesn’t factor in; anything that fits inside ships for one price.

One service that is not available for military addresses: Collect on Delivery (COD).

Size, Weight, and Packaging

Maximum size and weight depend on the specific APO/FPO/DPO location, not just the mail class. Each destination has a restriction code tied to its ZIP code. Some locations accept parcels up to 108 inches in combined length and girth. Others restrict all mail to what fits inside a standard mail sack, roughly 20 by 12 by 12 inches with a 68-inch combined length and girth limit. Certain remote or operationally restricted posts cap packages at 25 pounds and even smaller dimensions. DPO locations have their own ceiling of 27 by 14 by 14 inches.⁵ Check the restrictions for the recipient’s specific ZIP code before you pack.

Military mail gets handled more roughly than typical domestic packages. It passes through multiple sorting facilities, rides on military or commercial aircraft, and may sit in extreme heat or cold during transport. Use sturdy boxes, fill empty space with cushioning material, and seal every seam with packing tape. Items that would survive a domestic shipment in a padded envelope may need a rigid box for overseas military routes.

What You Can’t Send

APO/FPO/DPO packages travel by air and enter foreign countries, so some items are universally restricted:

Alcohol. Beer, wine, and liquor cannot be sent through the mail except in very limited circumstances.
Flammable materials. This includes hand sanitizers and most sanitizing wipes containing alcohol, which are classified as hazardous materials and prohibited for air transport to APO/FPO/DPO destinations.
Lithium batteries. Pre-owned, damaged, or defective electronics containing lithium batteries are prohibited in air transportation. Since virtually all military mail travels by air at some point, this is a practical ban on shipping used electronics with suspect batteries.
Aerosols. Pressurized containers like spray paint, hairspray, and certain cleaning products have specific rules and are often restricted.

Penalties for knowingly mailing dangerous materials start at $250 per violation and can reach $100,000, plus cleanup costs, damages, and potential criminal charges.⁶

Perishable food is another guaranteed failure. Anything requiring refrigeration, plus soft cheese and high-moisture baked goods like pumpkin bread, will spoil or mold before it arrives. Glass containers break. Fragile cookies crumble. What survives the trip: beef jerky and dried fruits, shelf-stable canned goods (tell the recipient to discard any swollen or dented cans), hard candies, fudge, toffee, dense baked goods like fruitcake and biscotti, commercially packaged cookies in airtight tins, trail mix, and dehydrated soups. Wrap each piece of homemade candy or cookie individually and cushion everything.⁷

Customs Forms Are Required

Every package sent to an APO/FPO/DPO address needs a customs declaration, even though you’re paying domestic rates. The two main forms are PS Form 2976 for smaller, lower-value items and PS Form 2976-A for larger or higher-value shipments. All customs forms must now be generated electronically through an approved USPS system. Handwritten or hard-copy customs forms with preprinted barcodes are no longer accepted. USPS Click-N-Ship handles this automatically when you ship online. Bringing a package to the counter without the required electronic customs data can result in the Post Office refusing to accept it.⁸

You’ll need to provide a detailed description of each item, its quantity, net weight, value, and the appropriate Harmonized System (HS) tariff code. Declare everything accurately. Undervaluing contents or vaguely describing items as “gifts” invites delays, inspections, and potential penalties.⁶

Delivery Times and Tracking

Transit times depend on the destination region and the mail class. USPS publishes the following estimates:⁹

Europe and the Atlantic (AE ZIP codes 090–092, 094–099): Priority Mail 7–9 days; USPS Ground Advantage 30–45 days.
Middle East (AE ZIP codes starting with 093): Priority Mail 7–13 days; USPS Ground Advantage 20–24 days.
Pacific and Far East (AP ZIP codes 962–966): Priority Mail 7–9 days; USPS Ground Advantage 30–45 days.

These are estimates, not guarantees. Operational security, base location, and transportation availability all affect actual delivery. A package to a major base in Germany will move faster than one bound for a forward operating location.

Tracking is available for Priority Mail Express, Priority Mail, Certified Mail, Registered Mail, and First-Class Package Service, among other services. Once a package leaves USPS jurisdiction and enters the Military Postal Service Agency’s system, detailed tracking updates often stop. If tracking shows the package was handed off to the MPSA and then goes silent, file a case directly with the Military Postal Service Agency rather than with USPS.²

Insurance and Claims If Something Goes Wrong

Priority Mail and USPS Ground Advantage both include up to $100 of insurance in the base price. You can buy additional standard insurance for up to $5,000 in coverage, or up to $50,000 through Registered Mail at a Post Office.¹⁰

Filing deadlines for a lost or damaged package depend on the mail class:¹¹

Priority Mail Express Military: File after 21 days, no later than 180 days from mailing.
Insured Mail via Priority Mail, First-Class, or USPS Ground Advantage (air): File after 45 days, no later than one year from mailing.
Insured Mail (surface only): File after 75 days, no later than one year from mailing.
Damaged or missing contents: File immediately, but no later than 60 days from mailing.

To file, you’ll need the tracking or label number, proof you purchased insurance (the mailing receipt, printed label record, or the outer packaging showing the insured label), proof of the item’s value (a sales receipt, invoice, credit card statement, or online transaction printout), and for damage claims, clear photos of the damage along with an estimate of repair costs. Keep the original packaging and all contents until the claim is fully resolved.¹¹

1
Department of Defense (DoD). DoD Instruction 4525.09, Military Postal Service
2
AAFES. USPS Military Mail Guide
3
USPS. How Do I Address Military Mail
4
USPS. ZIP Code Lookup
5
USPS. Military and Diplomatic Mail
6
USPS. Shipping Restrictions and HAZMAT – What Can You Send in the Mail
7
U.S. Department of Agriculture. Tips on Sending Food Gifts to U.S. Military
8
Postal Explorer: Mailing Standards of the United States Postal Service – International Mail Manual. Mailing Standards of the United States Postal Service, International Mail Manual
9
USPS. Sending Military and Diplomatic Mail
10
USPS. Insurance and Extra Services
11
USPS. File a Claim – Domestic