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Where 21866 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 21866 into a pocket calculator and turn it upside down: ggBIZ — not quite a word, sorry.
- ➕ As a number, 21,866 = 2 × 13 × 29 × 29. Its digits add up to 23, a total 2,533 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101010101101010 - 🏠 Its numerical neighbours: 21865 (Tyaskin, MD, 24 mi away) and 21867 (Upper Fairmount, MD, 16 mi away).
- 🔄 Backwards, 21866 becomes 66812, which is not a ZIP code at all.
- 👥 18 other ZIP codes are made of exactly the same digits (12866, 16682, 16826, 18626, 21668, 26681, …). The farthest-flung twin is 81626 in Craig, CO, 1,687 miles away.
- 🧭 Farther south than 58% of all ZIP codes, and farther east than 85%.
- 🎯1,217 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21866 and you would come out at 37.97°S, 103.98°E — 790 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 48m of daylight. Shortest: 9h 32m.
- 📏 At 0.123 square miles of land, 21866 is bigger than 2% of ZIP codes — about 60 football fields.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 81This ZIP81 |
|---|---|
| Households | 53This ZIP53 |
| Housing units | 73This ZIP73 |
| Median age | 60.6This ZIP60.6Maryland39.4US 38.9 |
| Median household income | $95,250This ZIP$95,250Maryland$103,678US $80,734 |
| Median home value | $177,500This ZIP$177,500Maryland$419,900US $332,700 |
| Bachelor's degree or higher | 4.9%This ZIP4.9% |
| Population density | 658.5 / sq miThis ZIP658.5 / sq mi |
Land area
| Land area | 0.12 sq miThis ZIP0.12 sq mi |
|---|---|
| Water area | 0.00 sq mi |
Other place names in 21866
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21866
| ZIP | City | Distance |
|---|---|---|
21824 | Ewell, MD | 1.5 mi |
23440 | Tangier, VA | 10.0 mi |
21817 | Crisfield, MD | 10.1 mi |
21821 | Deal Island, MD | 14.8 mi |
22530 | Ophelia, VA | 15.4 mi |
21838 | Marion Station, MD | 15.8 mi |
21867 | Upper Fairmount, MD | 15.8 mi |
22539 | Reedville, VA | 16.2 mi |
23427 | Saxis, VA | 17.2 mi |
21836 | Manokin, MD | 17.7 mi |
Find every ZIP code within 10 miles of 21866 →
Questions about this ZIP code
Where is ZIP code 21866?
21866 is in Tylerton, Maryland, in Somerset County, part of the Salisbury, MD metropolitan area. Its published point location is 37.9671, -76.0214.
What county is 21866 in?
21866 lies in Somerset County.
What area code is 21866?
Tylerton uses area codes 410, 443 and 667, from NANPA's telephone records.
What time zone is 21866 in?
21866 uses America/New_York.
How many people live in 21866?
About 81 people live in ZIP code 21866, in 53 households, at 658.5 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 21866?
$95,250 a year, against $103,678 across Maryland.
What ZIP codes are near 21866?
The closest are 21824 (1.5 mi), 23440 (10 mi), 21817 (10.1 mi), 21821 (14.8 mi) and 22530 (15.4 mi).
Is 21866 a PO Box ZIP code?
21866 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21866 ZIP Code — Tylerton, Maryland (Somerset County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21866
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21866.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.