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ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — ZIP/09421

09421

ZIP 09421 is military mail, not a town: FPO AE, the Armed Forces Europe routing code, which covers Europe, the Middle East, Africa and Canada. FPO is the Fleet Post Office, which serves Navy and Marine Corps bases and ships. Mail to it carries a unit or ship number instead of a street, at domestic US postage.

Type
Military (APO/FPO/DPO)
Time zone
Europe/London
County
none
Metro area
none
Coordinates
51.5085, -0.1257
☼ Live from 09421 — FPO AE

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Where 09421 is

This ZIP code has no Census tabulation area, so there is no boundary to draw — the marker is its published point location.

★ Weird and wonderful facts about 09421
  • 🔢 Type 09421 into a pocket calculator and turn it upside down: IZhGO — not quite a word, sorry.
  • ➕ 09421 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 16, a total 1,922 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10010011001101
  • 🏠 Its numerical neighbours: 09420 (FPO AE, a military post office, 216 mi away) and 09422 (FPO AE, a military post office, 355 mi away). Next door on paper, a road trip in real life.
  • 🔄 Backwards, 09421 becomes 12490 — and that is a real ZIP code: West Camp, NY, 3,398 miles away.
  • 👥 56 other ZIP codes are made of exactly the same digits (02149, 02914, 04219, 04291, 04912, 04921, …). The farthest-flung twin is 92140 in San Diego, CA, 5,482 miles away.
  • 🧭 Farther north than 99% of all ZIP codes, and farther east than 98%.
  • 🎯4,454 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 09421 and you would come out at 51.51°S, 179.87°E — 646 miles from Christchurch, New Zealand, the nearest big city to that spot.
  • ☀Longest day of the year: 16h 38m of daylight. Shortest: 7h 49m.
🌙 The sky over 09421 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

Land area

ZIP codes near 09421

ZIPCityDistance
09498 APO AE, AE 0.0 mi
09499 APO AE, AE 0.0 mi
09449 APO AE, AE 15.5 mi
09471 APO AE, AE 28.0 mi
09450 APO AE, AE 38.7 mi
09447 APO AE, AE 52.1 mi
09462 APO AE, AE 52.1 mi
09463 APO AE, AE 52.1 mi
09495 APO AE, AE 52.1 mi
09494 APO AE, AE 57.2 mi

Find every ZIP code within 10 miles of 09421 →

Questions about this ZIP code

Where is ZIP code 09421?

ZIP 09421 is military mail, not a town: FPO AE, the Armed Forces Europe routing code, which covers Europe, the Middle East, Africa and Canada. FPO is the Fleet Post Office, which serves Navy and Marine Corps bases and ships. Mail to it carries a unit or ship number instead of a street, at domestic US postage.

What county is 09421 in?

09421 belongs to no county — military ZIP codes are mail routing codes, not places.

What ZIP codes are near 09421?

The closest are 09498 (0 mi), 09499 (0 mi), 09449 (15.5 mi), 09471 (28 mi) and 09450 (38.7 mi).

Is 09421 a PO Box ZIP code?

09421 is a military (apo/fpo/dpo) ZIP code. A USPS routing code for military mail, not a geographic area.

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Cite this page

zipcodes.pro. “09421 ZIP Code — FPO AE, Armed Forces Europe (Military Mail).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/09421

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/09421.json

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