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Where 81021 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.
- 🔢 Type 81021 into a pocket calculator and turn it upside down: IZOIB — not quite a word, sorry.
- ➕ As a number, 81,021 = 3 × 113 × 239. Its digits add up to 12, a total 940 other ZIP codes share.
- 💾In binary, the way a computer stores it:
10011110001111101 - 🏠 Its numerical neighbours: 81020 (Aguilar, CO, 94 mi away) and 81022 (Avondale, CO, 64 mi away).
- 🔄 Backwards, 81021 becomes 12018 — and that is a real ZIP code: Averill Park, NY, 1,586 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, 1,711 miles away.
- 🧭 Farther south than 55% of all ZIP codes, and farther west than 82%.
- 🎯275 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 81021 and you would come out at 38.42°S, 76.62°E — 819 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 14h 51m of daylight. Shortest: 9h 29m.
- 📏 At 292.8 square miles of land, 81021 is bigger than 95% of ZIP codes — room for about 222 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 12This ZIP12 |
|---|---|
| Households | 8This ZIP8 |
| Housing units | 13This ZIP13 |
| Median age | 65.8This ZIP65.8Colorado37.7US 38.9 |
| Bachelor's degree or higher | 0.0% |
| Population density | under 0.1 / sq mi |
Land area
| Land area | 292.78 sq miThis ZIP292.78 sq mi |
|---|---|
| Water area | 3.94 sq miThis ZIP3.94 sq mi |
Counties 81021 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Kiowa County | 67.7% |
| Lincoln County | 32.3% |
ZIP codes near 81021
| ZIP | City | Distance |
|---|---|---|
81076 | Sugar City, CO | 13.3 mi |
81045 | Haswell, CO | 15.7 mi |
80823 | Karval, CO | 17.0 mi |
81063 | Ordway, CO | 21.4 mi |
81030 | Cheraw, CO | 22.9 mi |
81092 | Wiley, CO | 29.0 mi |
81033 | Crowley, CO | 30.2 mi |
81034 | Crowley, CO | 30.3 mi |
81077 | Swink, CO | 30.5 mi |
81036 | Eads, CO | 31.6 mi |
Find every ZIP code within 10 miles of 81021 →
Questions about this ZIP code
Where is ZIP code 81021?
81021 is in Arlington, Colorado, in Kiowa County. Its published point location is 38.4192, -103.3765.
What county is 81021 in?
81021 spans 2 counties: Kiowa County and Lincoln County. Most of it falls in Kiowa 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 81021?
Arlington uses area code 719, from NANPA's telephone records.
What time zone is 81021 in?
81021 uses America/Denver.
How many people live in 81021?
About 12 people live in ZIP code 81021, in 8 households, at under 0.1 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.
What ZIP codes are near 81021?
The closest are 81076 (13.3 mi), 81045 (15.7 mi), 80823 (17 mi), 81063 (21.4 mi) and 81030 (22.9 mi).
Is 81021 a PO Box ZIP code?
81021 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “81021 ZIP Code — Arlington, Colorado (Kiowa County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/81021
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/81021.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.