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/81231

81231

ZIP 81231 is in Gunnison, Colorado, in Gunnison County; area code 970; Mountain time. Gunnison has 2 ZIP codes; the other is 81230.

Type
No street area
Time zone
America/Denver
County
Gunnison
Metro area
none
Coordinates
38.5458, -106.9253

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 81230, whose figures describe that area — not this ZIP code.

☼ Live from 81231 — Gunnison, CO

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Where 81231 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 81231
  • 🔢 Type 81231 into a pocket calculator and turn it upside down: IEZIB — not quite a word, sorry.
  • ➕ As a number, 81,231 = 3 × 27077. Its digits add up to 15, a total 1,657 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011110101001111
  • 🏠 Its numerical neighbours: 81230 (Gunnison, CO, 11 mi away) and 81232 (Hillside, CO, 74 mi away).
  • 🔄 Backwards, 81231 becomes 13218 — and that is a real ZIP code: Syracuse, NY, 1,628 miles away.
  • 👥 23 other ZIP codes are made of exactly the same digits (11238, 12138, 12183, 12831, 13218, 13812, …). The farthest-flung twin is 12138 in Petersburg, NY, 1,771 miles away.
  • 🧭 Farther south than 55% of all ZIP codes, and farther west than 84%.
  • 🎯455 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 81231 and you would come out at 38.55°S, 73.07°E — 760 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 52m of daylight. Shortest: 9h 28m.
🌙 The sky over 81231 today
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🌋 Shake report
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Source: USGS.

Business and tax activity

Business establishments4This ZIP4
Employees37This ZIP37
Annual payroll$1,328,000This ZIP$1,328,000

Land area

ZIP codes near 81231

ZIPCityDistance
81230 Gunnison, CO 10.5 mi
81237 Ohio City, CO 17.1 mi
81239 Parlin, CO 17.1 mi
81210 Almont, CO 22.5 mi
81224 Crested Butte, CO 23.1 mi
81243 Powderhorn, CO 24.1 mi
81241 Pitkin, CO 24.3 mi
81248 Sargents, CO 24.6 mi
81225 Crested Butte, CO 29.2 mi
81227 Monarch, CO 34.3 mi

Find every ZIP code within 10 miles of 81231 →

Questions about this ZIP code

Where is ZIP code 81231?

81231 is in Gunnison, Colorado, in Gunnison County. Its published point location is 38.5458, -106.9253.

What county is 81231 in?

81231 lies in Gunnison County.

What area code is 81231?

Gunnison uses area code 970, from NANPA's telephone records.

What time zone is 81231 in?

81231 uses America/Denver.

What ZIP codes are near 81231?

The closest are 81230 (10.5 mi), 81237 (17.1 mi), 81239 (17.1 mi), 81210 (22.5 mi) and 81224 (23.1 mi).

Is 81231 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. “81231 ZIP Code — Gunnison, Colorado (Gunnison County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/81231

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