Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

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/40122

40122

ZIP 40122 is in Fort Knox, Kentucky, in Hardin County; Eastern time. Fort Knox has 2 ZIP codes; the other is 40121.

Type
No street area
Time zone
America/New_York
County
Hardin
Metro area
Elizabethtown, KY
Coordinates
37.8911, -85.9636

The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

This ZIP code has no Census tabulation area of its own. Its point falls inside ZCTA 40121, whose figures describe that area — not this ZIP code.

☼ Live from 40122 — Fort Knox, KY

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Local time: —

Where 40122 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 40122
  • 🔢 Type 40122 into a pocket calculator and turn it upside down: ZZIOh — not quite a word, sorry.
  • ➕ As a number, 40,122 = 2 × 3 × 3 × 3 × 743. Its digits add up to 9, a total 375 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1001110010111010
  • 🏠 Its numerical neighbours: 40121 (Fort Knox, KY, 2 mi away) and 40129 (Hillview, KY, 20 mi away).
  • 🔄 Backwards, 40122 becomes 22104, which is not a ZIP code at all.
  • 👥 43 other ZIP codes are made of exactly the same digits (01224, 01242, 02124, 02142, 02241, 02421, …). The farthest-flung twin is 04221 in Canton, ME, 931 miles away.
  • 🧭 Farther south than 59% of all ZIP codes, and farther east than 54%.
  • 🎯691 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 40122 and you would come out at 37.89°S, 94.04°E — 1,299 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 48m of daylight. Shortest: 9h 32m.
🌙 The sky over 40122 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

Land area

ZIP codes near 40122

ZIPCityDistance
40121 Fort Knox, KY 2.5 mi
40155 Muldraugh, KY 4.3 mi
40160 Radcliff, KY 5.7 mi
40177 West Point, KY 8.0 mi
40175 Vine Grove, KY 8.5 mi
40117 Ekron, KY 8.8 mi
40162 Rineyville, KY 10.8 mi
40159 Radcliff, KY 11.6 mi
47135 Laconia, IN 12.5 mi
40108 Brandenburg, KY 12.6 mi

Find every ZIP code within 10 miles of 40122 →

Questions about this ZIP code

Where is ZIP code 40122?

40122 is in Fort Knox, Kentucky, in Hardin County, part of the Elizabethtown, KY metropolitan area. Its published point location is 37.8911, -85.9636.

What county is 40122 in?

40122 lies in Hardin County.

What time zone is 40122 in?

40122 uses America/New_York.

What ZIP codes are near 40122?

The closest are 40121 (2.5 mi), 40155 (4.3 mi), 40160 (5.7 mi), 40177 (8 mi) and 40175 (8.5 mi).

Is 40122 a PO Box ZIP code?

Possibly. The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

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Cite this page

zipcodes.pro. “40122 ZIP Code — Fort Knox, Kentucky (Hardin County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/40122

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/40122.json

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