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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/80123

80123

ZIP 80123 is in Littleton, Colorado, mostly in Jefferson County; area codes 303, 720 and 983; Mountain time. Littleton has 16 ZIP codes in all.

Type
Standard
Time zone
America/Denver
County
Jefferson +2 more
Population
44,549
Coordinates
39.6160, -105.0694
☼ Live from 80123 — Littleton, CO

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Local time: —

Where 80123 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 80123
  • 🔢 Type 80123 into a pocket calculator and turn it upside down: EZIOB — not quite a word, sorry.
  • ➕ As a number, 80,123 = 19 × 4217. Its digits add up to 14, a total 1,416 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011100011111011
  • 🏠 Its numerical neighbours: 80122 (Littleton, CO, 7 mi away) and 80124 (Lone Tree, CO, 11 mi away).
  • 🔄 Backwards, 80123 becomes 32108, which is not a ZIP code at all.
  • 👥 70 other ZIP codes are made of exactly the same digits (01238, 01832, 02138, 02381, 02813, 02831, …). The farthest-flung twin is 02381 in White Horse Beach, MA, 1,800 miles away.
  • 🧭 Farther north than 53% of all ZIP codes, and farther west than 83%.
  • 🎯345 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 80123 and you would come out at 39.62°S, 74.93°E — 711 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 12.0 square miles of land, 80123 is bigger than 30% of ZIP codes — room for about 9.1 Central Parks.
🌙 The sky over 80123 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population44,549This ZIP44,549
Households19,270This ZIP19,270
Housing units19,953This ZIP19,953
Median age41.8This ZIP41.8Colorado37.7US 38.9
Median household income$105,932This ZIP$105,932Colorado$95,470US $80,734
Median home value$620,100This ZIP$620,100Colorado$539,400US $332,700
Median gross rent$2,077This ZIP$2,077Colorado$1,761US $1,413
Bachelor's degree or higher53.7%This ZIP53.7%
Mean commute26.2 minThis ZIP26.2 min
Population density3,705.0 / sq miThis ZIP3,705.0 / sq mi

Business and tax activity

Business establishments1,276This ZIP1,276
Employees12,942This ZIP12,942
Annual payroll$519,093,000This ZIP$519,093,000
Tax returns filed24,740This ZIP24,740
Total adjusted gross income$3,324,998,000This ZIP$3,324,998,000

Land area

Land area12.02 sq miThis ZIP12.02 sq mi
Water area1.68 sq miThis ZIP1.68 sq mi

Counties 80123 spans

A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.

CountyShare of this ZIP
Jefferson County 49.6%
Arapahoe County 31.4%
Denver County 18.9%

Other place names in 80123

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

ZIP codes near 80123

ZIPCityDistance
80235 Denver, CO 2.4 mi
80160 Littleton, CO 2.8 mi
80161 Littleton, CO 2.8 mi
80165 Littleton, CO 2.8 mi
80166 Littleton, CO 2.8 mi
80236 Denver, CO 2.9 mi
80120 Littleton, CO 3.4 mi
80110 Englewood, CO 3.7 mi
80227 Denver, CO 3.8 mi
80128 Littleton, CO 3.8 mi

Find every ZIP code within 10 miles of 80123 →

Questions about this ZIP code

Where is ZIP code 80123?

80123 is in Littleton, Colorado, in Jefferson County, part of the Denver-Aurora-Centennial, CO metropolitan area. Its published point location is 39.6160, -105.0694.

What county is 80123 in?

80123 spans 3 counties: Jefferson County, Arapahoe County and Denver County. Most of it falls in Jefferson County, measured by overlapping land area — the county holding the most land in a ZIP code is not always the one holding the most residents.

What area code is 80123?

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

What time zone is 80123 in?

80123 uses America/Denver.

How many people live in 80123?

About 44,549 people live in ZIP code 80123, in 19,270 households, at 3,705.0 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 80123?

$105,932 a year, against $95,470 across Colorado.

What ZIP codes are near 80123?

The closest are 80235 (2.4 mi), 80160 (2.8 mi), 80161 (2.8 mi), 80165 (2.8 mi) and 80166 (2.8 mi).

Is 80123 a PO Box ZIP code?

80123 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “80123 ZIP Code — Littleton, Colorado (Jefferson County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/80123

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