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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/09821

09821

ZIP 09821 is military mail, not a town: APO AE, the Armed Forces Europe routing code, which covers Europe, the Middle East, Africa and Canada. APO is the Army and Air Force Post Office. 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/Istanbul
County
none
Metro area
none
Coordinates
38.4127, 27.1384
☼ Live from 09821 — APO AE

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Where 09821 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 09821
  • 🔢 Type 09821 into a pocket calculator and turn it upside down: IZBGO — not quite a word, sorry.
  • ➕ As a number, 9,821 = 7 × 23 × 61. Its digits add up to 20, a total 2,586 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011001011101
  • 🏠 Its numerical neighbours: 09820 (APO AE, a military post office, 491 mi away) and 09822 (APO AE, a military post office, 323 mi away). Next door on paper, a road trip in real life.
  • 🔄 Backwards, 09821 becomes 12890, which is not a ZIP code at all.
  • 👥 59 other ZIP codes are made of exactly the same digits (01982, 02189, 02891, 02918, 08219, 09128, …). The farthest-flung twin is 92108 in San Diego, CA, 7,010 miles away.
  • 🧭 Farther south than 55% of all ZIP codes, and farther east than 99%.
  • 🎯6,034 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 09821 and you would come out at 38.41°S, 152.86°W — 1,258 miles from Avarua, Cook Islands, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 51m of daylight. Shortest: 9h 29m.
🌙 The sky over 09821 today
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Source: USGS.

Land area

ZIP codes near 09821

ZIPCityDistance
09819 APO AE, AE 0.0 mi
09816 APO AE, AE 94.4 mi
09847 FPO AE, AE 173.0 mi
09840 APO AE, AE 188.2 mi
09841 APO AE, AE 188.2 mi
09842 APO AE, AE 188.2 mi
09845 APO AE, AE 196.8 mi
09827 APO AE, AE 203.9 mi
09826 APO AE, AE 204.4 mi
09846 APO AE, AE 240.0 mi

Find every ZIP code within 10 miles of 09821 →

Questions about this ZIP code

Where is ZIP code 09821?

ZIP 09821 is military mail, not a town: APO AE, the Armed Forces Europe routing code, which covers Europe, the Middle East, Africa and Canada. APO is the Army and Air Force Post Office. Mail to it carries a unit or ship number instead of a street, at domestic US postage.

What county is 09821 in?

09821 belongs to no county — military ZIP codes are mail routing codes, not places.

What ZIP codes are near 09821?

The closest are 09819 (0 mi), 09816 (94.4 mi), 09847 (173 mi), 09840 (188.2 mi) and 09841 (188.2 mi).

Is 09821 a PO Box ZIP code?

09821 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. “09821 ZIP Code — APO AE, Armed Forces Europe (Military Mail).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/09821

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/09821.json

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