An address ending in APO AE, FPO AP or DPO AE can look wrong to a checkout form built around ordinary cities and states. Do not fix that mismatch by substituting the recipient’s overseas city.
Use APO, FPO or DPO in City, and the assigned AA, AE or AP code in State. Keep the recipient’s delivery line and ZIP together with those codes. The USPS addressing rules exclude foreign city and country names from these postal addresses. USPS DMM 703
This guide maps an address you already have to USPS-style fields. Obtain the complete address from the recipient first. It does not provide an address to borrow, cover diplomatic pouch addressing, or turn every domestic military address into an APO/FPO/DPO address. Personnel within the United States may have conventional installation or street addresses.
Match each field to the supplied address
| Form field | What belongs there | What to preserve |
|---|---|---|
| Name / Recipient | The full name or specific job title supplied by the recipient, with relevant title details | Do not use a generic recipient such as “Any Service Member” |
| Address Line 1 / Street Address | The assigned delivery line, including its postal type, number and applicable BOX number | A UNIT or PSC line is not an invitation to invent a street |
| Address Line 2 | Continuation information only where the form’s instructions call for it | Do not split or drop identifiers just to fill two lines |
| City | APO, FPO or DPO, as supplied | Keep the postal designation, not the geographic city |
| State / Region | AA, AE or AP, as supplied | Do not substitute an ordinary state to pass validation |
| ZIP / Postal Code | The complete assigned ZIP or ZIP+4 | Keep leading zeros and any supplied four-digit extension |
| Country | The selection required by the service’s military-address flow | Check the distinction below before selecting a geographic destination |
USPS delivery-line guidance includes types such as CPR, OPC, PSC, UPR and UNIT. Copy the actual type and assigned identifiers; do not convert them into a house number and street name. Publication 28, section 238
A layout template, not a mailing address
[RECIPIENT FULL NAME OR SPECIFIC JOB TITLE]
[ASSIGNED DELIVERY LINE, INCLUDING APPLICABLE BOX DETAILS]
[APO, FPO OR DPO] [AA, AE OR AP] [ASSIGNED ZIP OR ZIP+4]
Replace the placeholders with the recipient’s information before mailing. Keep postal tokens such as UNIT, PSC and BOX in English even when the website interface uses another language. A military BOX entry is also not a reason to rewrite the line as an ordinary PO Box. See the PO Box versus street address guide for that separate distinction.
Which country should you select?
In the USPS Customs Form Indicator, the stated selection for APO/FPO/DPO destinations is United States (Domestic and APO/FPO/DPO Mail). That is evidence about this USPS tool, not a universal instruction for every retailer’s dropdown.
A retailer may offer a dedicated military-address flow or different labels. Follow its instructions and confirm that it supports the destination. If the necessary option is absent, ask the seller or support team. Do not use the overseas country, an unrelated state or an invented street as a workaround.
The rule about excluding foreign locations from the postal address and a website’s Country field describe different parts of the process. Inspect the saved address or generated label to ensure the form has not replaced the supplied postal routing. For mail originating outside the United States, also check the origin postal operator’s acceptance instructions.
When the form refuses the address
| Problem | Next check |
|---|---|
| No AA, AE or AP state option | Look for military-address instructions or confirm support with the seller |
| Autocomplete changes City to a geographic place | Check whether the APO/FPO/DPO designation survives after saving |
| Street validation rejects the assigned delivery line | Use the service’s documented process; do not add a fictional house number |
| ZIP loses a zero or the form demands an extension | Compare with the recipient’s complete ZIP and request missing information instead of guessing |
| Address saves but no shipping service appears | Check service and destination restrictions separately |
Publication 28, section 225 refers to ZIP or ZIP+4. Preserve what the recipient supplied. A five-digit example is not a reason to truncate a supplied extension, and a form requesting more information is not permission to invent the final four digits.
Verify the saved result before submitting
Compare the saved name, delivery-line tokens, unit and box identifiers, City, State and ZIP with the original. Then confirm the shipping service and any required paperwork. USPS provides further guidance and tools on its Military & Diplomatic Mail page. A correctly filled form alone does not establish that an item can be shipped or delivered.
For form designers, this is a useful separate test case: preserve postal City tokens, handle AA/AE/AP, and compare identifiers after saving. Those checks assess field handling, not deliverability.
The USAddressGen US address tool supports ordinary address-field practice. Its current interface does not offer AA/AE/AP military-address options; it should not be used to produce a real military mailing address. Neither the tool output nor the placeholders above establish residence or identity.
Sources checked on October 19, 2026. This article uses public USPS documentation; it does not report a live mailing test or a test of any retailer’s checkout.