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/80121

80121

ZIP 80121 is in Littleton, Colorado, in Arapahoe County; area codes 303, 720 and 983; Mountain time. Littleton has 16 ZIP codes in all.

Type
Standard
Time zone
America/Denver
County
Arapahoe
Population
18,029
Coordinates
39.6104, -104.9538
☼ Live from 80121 — Littleton, CO

Weather right now

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Local time: —

Where 80121 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 80121
  • 🔢 Type 80121 into a pocket calculator and turn it upside down: IZIOB — not quite a word, sorry.
  • ➕ As a number, 80,121 = 3 × 17 × 1571. Its digits add up to 12, a total 940 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011100011111001
  • 🏠 Its numerical neighbours: 80120 (Littleton, CO, 3 mi away) and 80122 (Littleton, CO, 2 mi away).
  • 🔄 Backwards, 80121 becomes 12108 — and that is a real ZIP code: Lake Pleasant, NY, 1,591 miles away.
  • 👥 34 other ZIP codes are made of exactly the same digits (01128, 01812, 01821, 02118, 10128, 10281, …). The farthest-flung twin is 02118 in Boston, MA, 1,766 miles away.
  • 🧭 Farther north than 53% of all ZIP codes, and farther west than 83%.
  • 🎯339 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 80121 and you would come out at 39.61°S, 75.05°E — 713 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 58m of daylight. Shortest: 9h 22m.
  • 📏 At 7.2 square miles of land, 80121 is bigger than 23% of ZIP codes — room for about 5.5 Central Parks.
🌙 The sky over 80121 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population18,029This ZIP18,029
Households7,270This ZIP7,270
Housing units7,497This ZIP7,497
Median age47.8This ZIP47.8Colorado37.7US 38.9
Median household income$142,056This ZIP$142,056Colorado$95,470US $80,734
Median home value$707,900This ZIP$707,900Colorado$539,400US $332,700
Median gross rent$2,151This ZIP$2,151Colorado$1,761US $1,413
Bachelor's degree or higher66.2%This ZIP66.2%
Mean commute24.7 minThis ZIP24.7 min
Population density2,499.9 / sq miThis ZIP2,499.9 / sq mi

Business and tax activity

Business establishments473This ZIP473
Employees3,804This ZIP3,804
Annual payroll$246,961,000This ZIP$246,961,000
Tax returns filed9,190This ZIP9,190
Total adjusted gross income$2,465,059,000This ZIP$2,465,059,000

Land area

Land area7.21 sq miThis ZIP7.21 sq mi
Water area0.01 sq miThis ZIP0.01 sq mi

Other place names in 80121

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

ZIP codes near 80121

ZIPCityDistance
80122 Littleton, CO 2.1 mi
80113 Englewood, CO 2.4 mi
80150 Englewood, CO 3.2 mi
80151 Englewood, CO 3.2 mi
80155 Englewood, CO 3.2 mi
80120 Littleton, CO 3.3 mi
80160 Littleton, CO 3.3 mi
80161 Littleton, CO 3.3 mi
80165 Littleton, CO 3.3 mi
80166 Littleton, CO 3.3 mi

Find every ZIP code within 10 miles of 80121 →

Questions about this ZIP code

Where is ZIP code 80121?

80121 is in Littleton, Colorado, in Arapahoe County, part of the Denver-Aurora-Centennial, CO metropolitan area. Its published point location is 39.6104, -104.9538.

What county is 80121 in?

80121 lies in Arapahoe County.

What area code is 80121?

Littleton uses area codes 303, 720 and 983, from NANPA's telephone records.

What time zone is 80121 in?

80121 uses America/Denver.

How many people live in 80121?

About 18,029 people live in ZIP code 80121, in 7,270 households, at 2,499.9 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 80121?

$142,056 a year, against $95,470 across Colorado.

What ZIP codes are near 80121?

The closest are 80122 (2.1 mi), 80113 (2.4 mi), 80150 (3.2 mi), 80151 (3.2 mi) and 80155 (3.2 mi).

Is 80121 a PO Box ZIP code?

80121 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “80121 ZIP Code — Littleton, Colorado (Arapahoe County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/80121

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