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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/09721

09721

ZIP 09721 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/Helsinki
County
none
Metro area
none
Coordinates
60.1695, 24.9354
☼ Live from 09721 — APO AE

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Where 09721 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 09721
  • 🔢 Type 09721 into a pocket calculator and turn it upside down: IZLGO — not quite a word, sorry.
  • ➕ 09721 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 19, a total 2,454 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10010111111001
  • 🏠 Its numerical neighbours: 09720 (APO AE, a military post office, 2,672 mi away) and 09722 (APO AE, a military post office, 630 mi away). Next door on paper, a road trip in real life.
  • 🔄 Backwards, 09721 becomes 12790 — and that is a real ZIP code: Wurtsboro, NY, 4,080 miles away.
  • 👥 53 other ZIP codes are made of exactly the same digits (02719, 02791, 02917, 07192, 07921, 09172, …). The farthest-flung twin is 92107 in San Diego, CA, 5,668 miles away.
  • 🧭 Farther north than 99% of all ZIP codes, and farther east than 99%.
  • 🎯4,825 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 09721 and you would come out at 60.17°S, 155.06°W — 1,764 miles from Christchurch, New Zealand, the nearest big city to that spot.
  • ☀Longest day of the year: 18h 56m of daylight. Shortest: 5h 49m.
🌙 The sky over 09721 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

Land area

ZIP codes near 09721

ZIPCityDistance
09723 APO AE, AE 0.0 mi

Find every ZIP code within 10 miles of 09721 →

Questions about this ZIP code

Where is ZIP code 09721?

ZIP 09721 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 09721 in?

09721 belongs to no county — military ZIP codes are mail routing codes, not places.

What ZIP codes are near 09721?

The closest are 09723 (0 mi).

Is 09721 a PO Box ZIP code?

09721 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. “09721 ZIP Code — APO AE, Armed Forces Europe (Military Mail).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/09721

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/09721.json

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