21781
ZIP 21781 is Saint James, Maryland, in Washington County; area codes 240, 301 and 227; Eastern time.
- Type
- Standard
- Time zone
- America/New_York
- County
- Washington
- Metro area
- Hagerstown-Martinsburg, MD-WV
- Population
- 25
- Coordinates
- 39.5713, -77.7598
Weather right now
Asking the National Weather Service…
Where 21781 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 21781 into a pocket calculator and turn it upside down: IBLIZ — not quite a word, sorry.
- ➕ As a number, 21,781 = 23 × 947. Its digits add up to 19, a total 2,454 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101010100010101 - 🏠 Its numerical neighbours: 21780 (Sabillasville, MD, 17 mi away) and 21782 (Sharpsburg, MD, 8 mi away).
- 🔄 Backwards, 21781 becomes 18712, which is not a ZIP code at all.
- 👥 25 other ZIP codes are made of exactly the same digits (11782, 12187, 12781, 12817, 12871, 17128, …). The farthest-flung twin is 87121 in Albuquerque, NM, 1,624 miles away.
- 🧭 Farther north than 53% of all ZIP codes, and farther east than 79%.
- 🎯1,104 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21781 and you would come out at 39.57°S, 102.24°E — 926 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 58m of daylight. Shortest: 9h 22m.
- 📏 At 0.240 square miles of land, 21781 is bigger than 3% of ZIP codes — about 116 football fields.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 25This ZIP25 |
|---|---|
| Households | 0 |
| Housing units | 0 |
| Median age | 21.9This ZIP21.9Maryland39.4US 38.9 |
| Bachelor's degree or higher | 0.0% |
| Population density | 104.2 / sq miThis ZIP104.2 / sq mi |
Land area
| Land area | 0.24 sq miThis ZIP0.24 sq mi |
|---|---|
| Water area | 0.00 sq mi |
Other place names in 21781
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21781
| ZIP | City | Distance |
|---|---|---|
21733 | Fairplay, MD | 1.5 mi |
21746 | Hagerstown, MD | 2.5 mi |
21795 | Williamsport, MD | 3.5 mi |
21734 | Funkstown, MD | 3.8 mi |
21740 | Hagerstown, MD | 4.3 mi |
21741 | Hagerstown, MD | 5.3 mi |
21747 | Hagerstown, MD | 5.3 mi |
21749 | Hagerstown, MD | 5.3 mi |
21713 | Boonsboro, MD | 5.8 mi |
25419 | Falling Waters, WV | 6.7 mi |
Find every ZIP code within 10 miles of 21781 →
Questions about this ZIP code
Where is ZIP code 21781?
21781 is in Saint James, Maryland, in Washington County, part of the Hagerstown-Martinsburg, MD-WV metropolitan area. Its published point location is 39.5713, -77.7598.
What county is 21781 in?
21781 lies in Washington County.
What area code is 21781?
Saint James uses area codes 240, 301 and 227, from NANPA's telephone records.
What time zone is 21781 in?
21781 uses America/New_York.
How many people live in 21781?
About 25 people live in ZIP code 21781, at 104.2 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 21781?
The closest are 21733 (1.5 mi), 21746 (2.5 mi), 21795 (3.5 mi), 21734 (3.8 mi) and 21740 (4.3 mi).
Is 21781 a PO Box ZIP code?
21781 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21781 ZIP Code — Saint James, Maryland (Washington County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21781
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21781.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.