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Where 21840 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 21840 into a pocket calculator and turn it upside down: OhBIZ — not quite a word, sorry.
- ➕ As a number, 21,840 = 2 × 2 × 2 × 2 × 3 × 5 × 7 × 13. Its digits add up to 15, a total 1,657 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101010101010000 - 🏠 Its numerical neighbours: 21838 (Marion Station, MD, 18 mi away) and 21841 (Newark, MD, 34 mi away).
- 🔄 Backwards, 21840 becomes 04812, which is not a ZIP code at all.
- 👥 58 other ZIP codes are made of exactly the same digits (01824, 01842, 02148, 02184, 02481, 02814, …). The farthest-flung twin is 84120 in West Valley City, UT, 1,919 miles away.
- 🧭 Farther south than 57% of all ZIP codes, and farther east than 85%.
- 🎯1,219 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21840 and you would come out at 38.25°S, 104.10°E — 794 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 50m of daylight. Shortest: 9h 30m.
- 📏 At 5.3 square miles of land, 21840 is bigger than 19% of ZIP codes — room for about 4.0 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 576This ZIP576 |
|---|---|
| Households | 179This ZIP179 |
| Housing units | 328This ZIP328 |
| Median age | 41.9This ZIP41.9Maryland39.4US 38.9 |
| Median home value | under $10,000This ZIPunder $10,000Maryland$419,900US $332,700 |
| Bachelor's degree or higher | 17.6%This ZIP17.6% |
| Population density | 109.3 / sq miThis ZIP109.3 / sq mi |
Business and tax activity
| Business establishments | 4This ZIP4 |
|---|---|
| Employees | 6This ZIP6 |
| Annual payroll | $347,000This ZIP$347,000 |
| Tax returns filed | 160This ZIP160 |
| Total adjusted gross income | $13,628,000This ZIP$13,628,000 |
Land area
| Land area | 5.27 sq miThis ZIP5.27 sq mi |
|---|---|
| Water area | 6.01 sq miThis ZIP6.01 sq mi |
Other place names in 21840
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21840
| ZIP | City | Distance |
|---|---|---|
21814 | Bivalve, MD | 3.1 mi |
21865 | Tyaskin, MD | 4.6 mi |
21821 | Deal Island, MD | 5.9 mi |
21627 | Crocheron, MD | 8.0 mi |
21856 | Quantico, MD | 8.0 mi |
21672 | Toddville, MD | 8.4 mi |
21869 | Vienna, MD | 9.6 mi |
21853 | Princess Anne, MD | 10.2 mi |
21675 | Wingate, MD | 10.7 mi |
21867 | Upper Fairmount, MD | 11.2 mi |
Find every ZIP code within 10 miles of 21840 →
Questions about this ZIP code
Where is ZIP code 21840?
21840 is in Nanticoke, Maryland, in Wicomico County, part of the Salisbury, MD metropolitan area. Its published point location is 38.2487, -75.9000.
What county is 21840 in?
21840 lies in Wicomico County.
What area code is 21840?
Nanticoke uses area codes 410, 443 and 667, from NANPA's telephone records.
What time zone is 21840 in?
21840 uses America/New_York.
How many people live in 21840?
About 576 people live in ZIP code 21840, in 179 households, at 109.3 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 21840?
The closest are 21814 (3.1 mi), 21865 (4.6 mi), 21821 (5.9 mi), 21627 (8 mi) and 21856 (8 mi).
Is 21840 a PO Box ZIP code?
21840 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21840 ZIP Code — Nanticoke, Maryland (Wicomico County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21840
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21840.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.