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Where 21540 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 21540 into a pocket calculator and turn it upside down: OhSIZ — not quite a word, sorry.
- ➕ As a number, 21,540 = 2 × 2 × 3 × 5 × 359. Its digits add up to 12, a total 940 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101010000100100 - 🏠 Its numerical neighbours: 21539 (Lonaconing, MD, 8 mi away) and 21541 (Mc Henry, MD, 18 mi away).
- 🔄 Backwards, 21540 becomes 04512, which is not a ZIP code at all.
- 👥 73 other ZIP codes are made of exactly the same digits (01245, 01254, 01452, 01524, 01542, 02145, …). The farthest-flung twin is 51240 in Inwood, IA, 938 miles away.
- 🧭 Farther north than 52% of all ZIP codes, and farther east than 76%.
- 🎯1,037 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21540 and you would come out at 39.48°S, 100.94°E — 983 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 58m of daylight. Shortest: 9h 23m.
- 📏 At 0.267 square miles of land, 21540 is bigger than 3% of ZIP codes — about 129 football fields.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 89This ZIP89 |
|---|---|
| Households | 35This ZIP35 |
| Housing units | 47This ZIP47 |
| Median age | 44.5This ZIP44.5Maryland39.4US 38.9 |
| Median household income | $81,250This ZIP$81,250Maryland$103,678US $80,734 |
| Median home value | $51,000This ZIP$51,000Maryland$419,900US $332,700 |
| Bachelor's degree or higher | 11.5%This ZIP11.5% |
| Mean commute | 24.8 minThis ZIP24.8 min |
| Population density | 333.3 / sq miThis ZIP333.3 / sq mi |
Land area
| Land area | 0.27 sq miThis ZIP0.27 sq mi |
|---|---|
| Water area | 0.04 sq miThis ZIP0.04 sq mi |
Other place names in 21540
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21540
| ZIP | City | Distance |
|---|---|---|
26750 | Piedmont, WV | 0.7 mi |
21523 | Bloomington, MD | 1.1 mi |
21562 | Westernport, MD | 2.6 mi |
21521 | Barton, MD | 4.9 mi |
26726 | Keyser, WV | 6.5 mi |
21561 | Swanton, MD | 7.3 mi |
21557 | Rawlings, MD | 7.6 mi |
21539 | Lonaconing, MD | 8.5 mi |
21542 | Midland, MD | 9.7 mi |
21538 | Kitzmiller, MD | 10.0 mi |
Find every ZIP code within 10 miles of 21540 →
Questions about this ZIP code
Where is ZIP code 21540?
21540 is in Luke, Maryland, in Allegany County, part of the Cumberland, MD-WV micropolitan area. Its published point location is 39.4788, -79.0589.
What county is 21540 in?
21540 lies in Allegany County.
What area code is 21540?
Luke uses area codes 240, 227 and 301, from NANPA's telephone records.
What time zone is 21540 in?
21540 uses America/New_York.
How many people live in 21540?
About 89 people live in ZIP code 21540, in 35 households, at 333.3 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 21540?
$81,250 a year, against $103,678 across Maryland.
What ZIP codes are near 21540?
The closest are 26750 (0.7 mi), 21523 (1.1 mi), 21562 (2.6 mi), 21521 (4.9 mi) and 26726 (6.5 mi).
Is 21540 a PO Box ZIP code?
21540 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21540 ZIP Code — Luke, Maryland (Allegany County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21540
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21540.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.