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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/80104

80104

ZIP 80104 is in Castle Rock, Colorado, in Douglas County; Mountain time. Castle Rock has 3 ZIP codes; the others are 80108 and 80109.

Type
Standard
Time zone
America/Denver
County
Douglas
Population
38,479
Coordinates
39.3021, -104.8197
☼ Live from 80104 — Castle Rock, CO

Weather right now

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Local time: —

Where 80104 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 80104
  • 🔢 Type 80104 into a pocket calculator and turn it upside down: hOIOB — not quite a word, sorry.
  • ➕ As a number, 80,104 = 2 × 2 × 2 × 17 × 19 × 31. Its digits add up to 13, a total 1,179 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011100011101000
  • 🏠 Its numerical neighbours: 80103 (Byers, CO, 51 mi away) and 80105 (Deer Trail, CO, 51 mi away).
  • 🔄 Backwards, 80104 becomes 40108 — and that is a real ZIP code: Brandenburg, KY, 1,009 miles away.
  • 👥 26 other ZIP codes are made of exactly the same digits (00841, 01084, 01840, 04108, 08014, 08041, …). The farthest-flung twin is 00841 in Frederiksted, VI, 2,815 miles away.
  • 🧭 Farther north than 51% of all ZIP codes, and farther west than 82%.
  • 🎯334 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 80104 and you would come out at 39.30°S, 75.18°E — 736 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 56m of daylight. Shortest: 9h 24m.
  • 📏 At 70.7 square miles of land, 80104 is bigger than 69% of ZIP codes — room for about 54 Central Parks.
🌙 The sky over 80104 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population38,479This ZIP38,479
Households14,383This ZIP14,383
Housing units14,891This ZIP14,891
Median age38.2This ZIP38.2Colorado37.7US 38.9
Median household income$134,335This ZIP$134,335Colorado$95,470US $80,734
Median home value$624,200This ZIP$624,200Colorado$539,400US $332,700
Median gross rent$1,880This ZIP$1,880Colorado$1,761US $1,413
Bachelor's degree or higher55.8%This ZIP55.8%
Mean commute29.5 minThis ZIP29.5 min
Population density544.5 / sq miThis ZIP544.5 / sq mi

Business and tax activity

Business establishments1,153This ZIP1,153
Employees9,236This ZIP9,236
Annual payroll$487,865,000This ZIP$487,865,000
Tax returns filed19,430This ZIP19,430
Total adjusted gross income$2,331,082,000This ZIP$2,331,082,000

Land area

Land area70.67 sq miThis ZIP70.67 sq mi
Water area0.00 sq mi

Other place names in 80104

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

ZIP codes near 80104

ZIPCityDistance
80116 Franktown, CO 6.0 mi
80109 Castle Rock, CO 6.9 mi
80118 Larkspur, CO 8.5 mi
80163 Littleton, CO 9.9 mi
80108 Castle Rock, CO 10.0 mi
80134 Parker, CO 12.7 mi
80133 Palmer Lake, CO 13.7 mi
80132 Monument, CO 15.0 mi
80107 Elizabeth, CO 15.2 mi
80131 Louviers, CO 15.7 mi

Find every ZIP code within 10 miles of 80104 →

Questions about this ZIP code

Where is ZIP code 80104?

80104 is in Castle Rock, Colorado, in Douglas County, part of the Denver-Aurora-Centennial, CO metropolitan area. Its published point location is 39.3021, -104.8197.

What county is 80104 in?

80104 lies in Douglas County.

What time zone is 80104 in?

80104 uses America/Denver.

How many people live in 80104?

About 38,479 people live in ZIP code 80104, in 14,383 households, at 544.5 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 80104?

$134,335 a year, against $95,470 across Colorado.

What ZIP codes are near 80104?

The closest are 80116 (6 mi), 80109 (6.9 mi), 80118 (8.5 mi), 80163 (9.9 mi) and 80108 (10 mi).

Is 80104 a PO Box ZIP code?

80104 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “80104 ZIP Code — Castle Rock, Colorado (Douglas County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/80104

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