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/80551

80551

ZIP 80551 is in Windsor, Colorado, in Weld County; area code 970; Mountain time. Windsor has 2 ZIP codes; the other is 80550.

Type
No street area
Time zone
America/Denver
County
Weld
Metro area
Greeley, CO
Coordinates
40.4775, -104.9014

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 80550, whose figures describe that area — not this ZIP code.

☼ Live from 80551 — Windsor, CO

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Where 80551 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 80551
  • 🔢 Type 80551 into a pocket calculator and turn it upside down: ISSOB — not quite a word, sorry.
  • ➕ As a number, 80,551 = 109 × 739. Its digits add up to 19, a total 2,454 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011101010100111
  • 🏠 Its numerical neighbours: 80550 (Windsor, CO, 1 mi away) and 80553 (Fort Collins, CO, 12 mi away).
  • 🔄 Backwards, 80551 becomes 15508, which is not a ZIP code at all.
  • 👥 28 other ZIP codes are made of exactly the same digits (01585, 05158, 05851, 08515, 08551, 15085, …). The farthest-flung twin is 01585 in West Brookfield, MA, 1,692 miles away.
  • 🧭 Farther north than 61% of all ZIP codes, and farther west than 83%.
  • 🎯337 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 80551 and you would come out at 40.48°S, 75.10°E — 657 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 04m of daylight. Shortest: 9h 17m.
🌙 The sky over 80551 today
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Source: USGS.

Land area

ZIP codes near 80551

ZIPCityDistance
80550 Windsor, CO 0.8 mi
80546 Severance, CO 4.4 mi
80547 Timnath, CO 4.8 mi
80528 Fort Collins, CO 5.6 mi
80634 Greeley, CO 7.8 mi
80525 Fort Collins, CO 8.1 mi
80543 Milliken, CO 9.1 mi
80632 Greeley, CO 10.1 mi
80534 Johnstown, CO 10.2 mi
80539 Loveland, CO 10.7 mi

Find every ZIP code within 10 miles of 80551 →

Questions about this ZIP code

Where is ZIP code 80551?

80551 is in Windsor, Colorado, in Weld County, part of the Greeley, CO metropolitan area. Its published point location is 40.4775, -104.9014.

What county is 80551 in?

80551 lies in Weld County.

What area code is 80551?

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

What time zone is 80551 in?

80551 uses America/Denver.

What ZIP codes are near 80551?

The closest are 80550 (0.8 mi), 80546 (4.4 mi), 80547 (4.8 mi), 80528 (5.6 mi) and 80634 (7.8 mi).

Is 80551 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. “80551 ZIP Code — Windsor, Colorado (Weld County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/80551

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/80551.json

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