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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/80521

80521

ZIP 80521 is in Fort Collins, Colorado, in Larimer County; area code 970; Mountain time. Fort Collins has 9 ZIP codes in all.

Type
Standard
Time zone
America/Denver
County
Larimer
Population
38,776
Coordinates
40.5931, -105.1274
☼ Live from 80521 — Fort Collins, CO

Weather right now

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Local time: —

Where 80521 is

Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.

★ Weird and wonderful facts about 80521
  • 🔢 Type 80521 into a pocket calculator and turn it upside down: IZSOB — not quite a word, sorry.
  • ➕ As a number, 80,521 = 7 × 11503. Its digits add up to 16, a total 1,922 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011101010001001
  • 🏠 Its numerical neighbours: 80520 (Firestone, CO, 35 mi away) and 80522 (Fort Collins, CO, 5 mi away).
  • 🔄 Backwards, 80521 becomes 12508 — and that is a real ZIP code: Beacon, NY, 1,617 miles away.
  • 👥 65 other ZIP codes are made of exactly the same digits (01258, 01825, 01852, 02185, 02815, 05821, …). The farthest-flung twin is 02185 in Braintree, MA, 1,756 miles away.
  • 🧭 Farther north than 62% of all ZIP codes, and farther west than 83%.
  • 🎯349 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 80521 and you would come out at 40.59°S, 74.87°E — 646 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.
  • 📏 At 14.0 square miles of land, 80521 is bigger than 32% of ZIP codes — room for about 11 Central Parks.
🌙 The sky over 80521 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population38,776This ZIP38,776
Households14,260This ZIP14,260
Housing units15,000This ZIP15,000
Median age22.9This ZIP22.9Colorado37.7US 38.9
Median household income$58,082This ZIP$58,082Colorado$95,470US $80,734
Median home value$564,900This ZIP$564,900Colorado$539,400US $332,700
Median gross rent$1,444This ZIP$1,444Colorado$1,761US $1,413
Bachelor's degree or higher64.0%This ZIP64.0%
Mean commute19.0 minThis ZIP19.0 min
Population density2,765.8 / sq miThis ZIP2,765.8 / sq mi

Business and tax activity

Business establishments653This ZIP653
Employees5,997This ZIP5,997
Annual payroll$359,481,000This ZIP$359,481,000
Tax returns filed14,140This ZIP14,140
Total adjusted gross income$965,978,000This ZIP$965,978,000

Land area

Land area14.02 sq miThis ZIP14.02 sq mi
Water area0.45 sq miThis ZIP0.45 sq mi

Other place names in 80521

Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.

ZIP codes near 80521

ZIPCityDistance
80523 Fort Collins, CO 2.3 mi
80527 Fort Collins, CO 2.3 mi
80553 Fort Collins, CO 2.3 mi
80526 Fort Collins, CO 4.9 mi
80522 Fort Collins, CO 5.0 mi
80524 Fort Collins, CO 6.3 mi
80525 Fort Collins, CO 6.4 mi
80538 Loveland, CO 7.0 mi
80541 Masonville, CO 8.5 mi
80528 Fort Collins, CO 9.1 mi

Find every ZIP code within 10 miles of 80521 →

Questions about this ZIP code

Where is ZIP code 80521?

80521 is in Fort Collins, Colorado, in Larimer County, part of the Fort Collins-Loveland, CO metropolitan area. Its published point location is 40.5931, -105.1274.

What county is 80521 in?

80521 lies in Larimer County.

What area code is 80521?

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

What time zone is 80521 in?

80521 uses America/Denver.

How many people live in 80521?

About 38,776 people live in ZIP code 80521, in 14,260 households, at 2,765.8 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What is the median household income in 80521?

$58,082 a year, against $95,470 across Colorado.

What ZIP codes are near 80521?

The closest are 80523 (2.3 mi), 80527 (2.3 mi), 80553 (2.3 mi), 80526 (4.9 mi) and 80522 (5 mi).

Is 80521 a PO Box ZIP code?

80521 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “80521 ZIP Code — Fort Collins, Colorado (Larimer County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/80521

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