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Where 21755 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 21755 into a pocket calculator and turn it upside down: SSLIZ — not quite a word, sorry.
- ➕ As a number, 21,755 = 5 × 19 × 229. Its digits add up to 20, a total 2,586 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101010011111011 - 🏠 Its numerical neighbours: 21754 (Ijamsville, MD, 14 mi away) and 21756 (Keedysville, MD, 10 mi away).
- 🔄 Backwards, 21755 becomes 55712 — and that is a real ZIP code: Bruno, MN, 894 miles away.
- 👥 31 other ZIP codes are made of exactly the same digits (12575, 15257, 15275, 15725, 15752, 17255, …). The farthest-flung twin is 57521 in Belvidere, SD, 1,254 miles away.
- 🧭 Farther north than 51% of all ZIP codes, and farther east than 80%.
- 🎯1,117 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21755 and you would come out at 39.36°S, 102.43°E — 910 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 57m of daylight. Shortest: 9h 23m.
- 📏 At 34.3 square miles of land, 21755 is bigger than 49% of ZIP codes — room for about 26 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 5,909This ZIP5,909 |
|---|---|
| Households | 2,136This ZIP2,136 |
| Housing units | 2,231This ZIP2,231 |
| Median age | 43.2This ZIP43.2Maryland39.4US 38.9 |
| Median household income | $137,417This ZIP$137,417Maryland$103,678US $80,734 |
| Median home value | $529,600This ZIP$529,600Maryland$419,900US $332,700 |
| Median gross rent | $1,265This ZIP$1,265Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 46.8%This ZIP46.8% |
| Mean commute | 31.4 minThis ZIP31.4 min |
| Population density | 172.2 / sq miThis ZIP172.2 / sq mi |
Business and tax activity
| Business establishments | 112This ZIP112 |
|---|---|
| Employees | 674This ZIP674 |
| Annual payroll | $33,075,000This ZIP$33,075,000 |
| Tax returns filed | 2,970This ZIP2,970 |
| Total adjusted gross income | $323,218,000This ZIP$323,218,000 |
Land area
| Land area | 34.32 sq miThis ZIP34.32 sq mi |
|---|---|
| Water area | 0.62 sq miThis ZIP0.62 sq mi |
Other place names in 21755
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21755
| ZIP | City | Distance |
|---|---|---|
21718 | Burkittsville, MD | 4.0 mi |
21716 | Brunswick, MD | 4.3 mi |
21714 | Braddock Heights, MD | 4.7 mi |
21758 | Knoxville, MD | 4.8 mi |
21703 | Frederick, MD | 5.1 mi |
21715 | Brownsville, MD | 5.1 mi |
21769 | Middletown, MD | 5.7 mi |
21777 | Point Of Rocks, MD | 5.9 mi |
21779 | Rohrersville, MD | 6.4 mi |
20180 | Lovettsville, VA | 7.3 mi |
Find every ZIP code within 10 miles of 21755 →
Questions about this ZIP code
Where is ZIP code 21755?
21755 is in Jefferson, Maryland, in Frederick County, part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan area. Its published point location is 39.3597, -77.5681.
What county is 21755 in?
21755 lies in Frederick County.
What area code is 21755?
Jefferson uses area codes 240, 301 and 227, from NANPA's telephone records.
What time zone is 21755 in?
21755 uses America/New_York.
How many people live in 21755?
About 5,909 people live in ZIP code 21755, in 2,136 households, at 172.2 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 21755?
$137,417 a year, against $103,678 across Maryland.
What ZIP codes are near 21755?
The closest are 21718 (4 mi), 21716 (4.3 mi), 21714 (4.7 mi), 21758 (4.8 mi) and 21703 (5.1 mi).
Is 21755 a PO Box ZIP code?
21755 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21755 ZIP Code — Jefferson, Maryland (Frederick County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21755
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21755.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.