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/80523

80523

ZIP 80523 is in Fort Collins, Colorado, in Larimer County; area code 970; Mountain time. Fort Collins has 9 ZIP codes in all.

Type
No street area
Time zone
America/Denver
County
Larimer
Coordinates
40.5853, -105.0844

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 80521, whose figures describe that area — not this ZIP code.

☼ Live from 80523 — Fort Collins, CO

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Where 80523 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 80523
  • 🔢 Type 80523 into a pocket calculator and turn it upside down: EZSOB — not quite a word, sorry.
  • ➕ As a number, 80,523 = 3 × 3 × 23 × 389. Its digits add up to 18, a total 2,332 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011101010001011
  • 🏠 Its numerical neighbours: 80522 (Fort Collins, CO, 4 mi away) and 80524 (Fort Collins, CO, 5 mi away).
  • 🔄 Backwards, 80523 becomes 32508 — and that is a real ZIP code: Pensacola, FL, 1,221 miles away.
  • 👥 64 other ZIP codes are made of exactly the same digits (02358, 02538, 02835, 03258, 03285, 03582, …). The farthest-flung twin is 02538 in East Wareham, MA, 1,781 miles away.
  • 🧭 Farther north than 62% of all ZIP codes, and farther west than 83%.
  • 🎯347 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 80523 and you would come out at 40.59°S, 74.92°E — 647 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 05m of daylight. Shortest: 9h 16m.
🌙 The sky over 80523 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments16This ZIP16
Employees124This ZIP124
Annual payroll$6,095,000This ZIP$6,095,000

Land area

ZIP codes near 80523

ZIPCityDistance
80527 Fort Collins, CO 0.0 mi
80553 Fort Collins, CO 0.0 mi
80521 Fort Collins, CO 2.3 mi
80522 Fort Collins, CO 4.2 mi
80525 Fort Collins, CO 4.6 mi
80526 Fort Collins, CO 5.0 mi
80524 Fort Collins, CO 5.1 mi
80528 Fort Collins, CO 7.3 mi
80547 Timnath, CO 7.4 mi
80538 Loveland, CO 8.9 mi

Find every ZIP code within 10 miles of 80523 →

Questions about this ZIP code

Where is ZIP code 80523?

80523 is in Fort Collins, Colorado, in Larimer County, part of the Fort Collins-Loveland, CO metropolitan area. Its published point location is 40.5853, -105.0844.

What county is 80523 in?

80523 lies in Larimer County.

What area code is 80523?

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

What time zone is 80523 in?

80523 uses America/Denver.

What ZIP codes are near 80523?

The closest are 80527 (0 mi), 80553 (0 mi), 80521 (2.3 mi), 80522 (4.2 mi) and 80525 (4.6 mi).

Is 80523 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. “80523 ZIP Code — Fort Collins, Colorado (Larimer County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/80523

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curl https://zipcodes.pro/zip/80523.json

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