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Where 21641 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 21641 into a pocket calculator and turn it upside down: IhgIZ — not quite a word, sorry.
- ➕ As a number, 21,641 = 17 × 19 × 67. Its digits add up to 14, a total 1,416 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101010010001001 - 🏠 Its numerical neighbours: 21640 (Henderson, MD, 12 mi away) and 21643 (Hurlock, MD, 19 mi away).
- 🔄 Backwards, 21641 becomes 14612 — and that is a real ZIP code: Rochester, NY, 314 miles away.
- 👥 30 other ZIP codes are made of exactly the same digits (11426, 12164, 12416, 12461, 14126, 14216, …). The farthest-flung twin is 64112 in Kansas City, MO, 1,000 miles away.
- 🧭 Farther south than 51% of all ZIP codes, and farther east than 85%.
- 🎯1,208 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21641 and you would come out at 38.92°S, 104.06°E — 819 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 54m of daylight. Shortest: 9h 26m.
- 📏 At 0.135 square miles of land, 21641 is bigger than 2% of ZIP codes — about 65 football fields.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 127This ZIP127 |
|---|---|
| Households | 56This ZIP56 |
| Housing units | 70This ZIP70 |
| Median age | 58.8This ZIP58.8Maryland39.4US 38.9 |
| Median household income | $66,875This ZIP$66,875Maryland$103,678US $80,734 |
| Median home value | $254,200This ZIP$254,200Maryland$419,900US $332,700 |
| Median gross rent | $955This ZIP$955Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 15.7%This ZIP15.7% |
| Mean commute | 31.8 minThis ZIP31.8 min |
| Population density | 940.7 / sq miThis ZIP940.7 / sq mi |
Land area
| Land area | 0.14 sq miThis ZIP0.14 sq mi |
|---|---|
| Water area | 0.00 sq mi |
Other place names in 21641
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21641
| ZIP | City | Distance |
|---|---|---|
21657 | Queen Anne, MD | 2.6 mi |
21660 | Ridgely, MD | 3.9 mi |
21625 | Cordova, MD | 4.2 mi |
21629 | Denton, MD | 7.5 mi |
21679 | Wye Mills, MD | 8.2 mi |
21639 | Greensboro, MD | 9.0 mi |
21636 | Goldsboro, MD | 10.4 mi |
21617 | Centreville, MD | 10.7 mi |
21658 | Queenstown, MD | 11.0 mi |
21656 | Price, MD | 11.5 mi |
Find every ZIP code within 10 miles of 21641 →
Questions about this ZIP code
Where is ZIP code 21641?
21641 is in Hillsboro, Maryland, in Caroline County. Its published point location is 38.9170, -75.9418.
What county is 21641 in?
21641 lies in Caroline County.
What area code is 21641?
Hillsboro uses area codes 667 and 410, from NANPA's telephone records.
What time zone is 21641 in?
21641 uses America/New_York.
How many people live in 21641?
About 127 people live in ZIP code 21641, in 56 households, at 940.7 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 21641?
$66,875 a year, against $103,678 across Maryland.
What ZIP codes are near 21641?
The closest are 21657 (2.6 mi), 21660 (3.9 mi), 21625 (4.2 mi), 21629 (7.5 mi) and 21679 (8.2 mi).
Is 21641 a PO Box ZIP code?
21641 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21641 ZIP Code — Hillsboro, Maryland (Caroline County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21641
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21641.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.