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/37831

37831

ZIP 37831 is in Oak Ridge, Tennessee, in Anderson County; area code 865; Eastern time. Oak Ridge has 2 ZIP codes; the other is 37830.

Type
No street area
Time zone
America/New_York
County
Anderson
Metro area
Knoxville, TN
Coordinates
36.1060, -84.1958

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 37716, whose figures describe that area — not this ZIP code.

☼ Live from 37831 — Oak Ridge, TN

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Where 37831 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 37831
  • 🔢 Type 37831 into a pocket calculator and turn it upside down: IEBLE — not quite a word, sorry.
  • ➕ 37831 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 22, a total 2,607 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1001001111000111
  • 🏠 Its numerical neighbours: 37830 (Oak Ridge, TN, 11 mi away) and 37840 (Oliver Springs, TN, 10 mi away).
  • 🔄 Backwards, 37831 becomes 13873, which is not a ZIP code at all.
  • 👥 25 other ZIP codes are made of exactly the same digits (13738, 13783, 17833, 18337, 31738, 31783, …). The farthest-flung twin is 83713 in Boise, ID, 1,769 miles away.
  • 🧭 Farther south than 69% of all ZIP codes, and farther east than 59%.
  • 🎯824 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 37831 and you would come out at 36.11°S, 95.80°E — 1,181 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 37m of daylight. Shortest: 9h 42m.
🌙 The sky over 37831 today
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Source: USGS.

Business and tax activity

Business establishments34This ZIP34
Employees8,834This ZIP8,834
Annual payroll$978,144,000This ZIP$978,144,000

Land area

ZIP codes near 37831

ZIPCityDistance
37716 Clinton, TN 1.6 mi
37717 Clinton, TN 1.6 mi
37710 Briceville, TN 7.7 mi
37769 Lake City, TN 8.0 mi
37849 Powell, TN 9.0 mi
37714 Caryville, TN 9.2 mi
37828 Norris, TN 9.5 mi
37754 Heiskell, TN 9.5 mi
37931 Knoxville, TN 9.8 mi
37840 Oliver Springs, TN 10.1 mi

Find every ZIP code within 10 miles of 37831 →

Questions about this ZIP code

Where is ZIP code 37831?

37831 is in Oak Ridge, Tennessee, in Anderson County, part of the Knoxville, TN metropolitan area. Its published point location is 36.1060, -84.1958.

What county is 37831 in?

37831 lies in Anderson County.

What area code is 37831?

Oak Ridge uses area code 865, from NANPA's telephone records.

What time zone is 37831 in?

37831 uses America/New_York.

What ZIP codes are near 37831?

The closest are 37716 (1.6 mi), 37717 (1.6 mi), 37710 (7.7 mi), 37769 (8 mi) and 37849 (9 mi).

Is 37831 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. “37831 ZIP Code — Oak Ridge, Tennessee (Anderson County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/37831

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curl https://zipcodes.pro/zip/37831.json

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