21783
ZIP 21783 is Smithsburg, Maryland, mostly in Washington County; area codes 240, 227 and 301; Eastern time.
- Type
- Standard
- Time zone
- America/New_York
- County
- Washington +1 more
- Metro area
- Hagerstown-Martinsburg, MD-WV
- Population
- 9,910
- Coordinates
- 39.6520, -77.5526
Weather right now
Asking the National Weather Service…
Where 21783 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 21783 into a pocket calculator and turn it upside down: EBLIZ — not quite a word, sorry.
- ➕ As a number, 21,783 = 3 × 53 × 137. Its digits add up to 21, a total 2,594 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101010100010111 - 🏠 Its numerical neighbours: 21782 (Sharpsburg, MD, 18 mi away) and 21784 (Sykesville, MD, 35 mi away).
- 🔄 Backwards, 21783 becomes 38712, which is not a ZIP code at all.
- 👥 56 other ZIP codes are made of exactly the same digits (12738, 12783, 12837, 12873, 13782, 13827, …). The farthest-flung twin is 83712 in Boise, ID, 1,991 miles away.
- 🧭 Farther north than 53% of all ZIP codes, and farther east than 80%.
- 🎯1,115 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21783 and you would come out at 39.65°S, 102.45°E — 919 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 59m of daylight. Shortest: 9h 22m.
- 📏 At 47.6 square miles of land, 21783 is bigger than 58% of ZIP codes — room for about 36 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 9,910This ZIP9,910 |
|---|---|
| Households | 3,632This ZIP3,632 |
| Housing units | 3,972This ZIP3,972 |
| Median age | 42.8This ZIP42.8Maryland39.4US 38.9 |
| Median household income | $100,750This ZIP$100,750Maryland$103,678US $80,734 |
| Median home value | $339,800This ZIP$339,800Maryland$419,900US $332,700 |
| Median gross rent | $1,070This ZIP$1,070Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 22.7%This ZIP22.7% |
| Mean commute | 32.5 minThis ZIP32.5 min |
| Population density | 208.2 / sq miThis ZIP208.2 / sq mi |
Business and tax activity
| Business establishments | 124This ZIP124 |
|---|---|
| Employees | 1,110This ZIP1,110 |
| Annual payroll | $49,019,000This ZIP$49,019,000 |
| Tax returns filed | 4,440This ZIP4,440 |
| Total adjusted gross income | $354,480,000This ZIP$354,480,000 |
Land area
| Land area | 47.60 sq miThis ZIP47.60 sq mi |
|---|---|
| Water area | 0.07 sq miThis ZIP0.07 sq mi |
Counties 21783 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Washington County | 72.9% |
| Frederick County | 27.1% |
Other place names in 21783
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21783
| ZIP | City | Distance |
|---|---|---|
21720 | Cavetown, MD | 1.7 mi |
21780 | Sabillasville, MD | 4.5 mi |
21721 | Chewsville, MD | 4.5 mi |
21719 | Cascade, MD | 4.6 mi |
21742 | Hagerstown, MD | 5.6 mi |
17250 | Rouzerville, PA | 6.0 mi |
21773 | Myersville, MD | 7.6 mi |
17214 | Blue Ridge Summit, PA | 8.0 mi |
21788 | Thurmont, MD | 8.5 mi |
17268 | Waynesboro, PA | 8.6 mi |
Find every ZIP code within 10 miles of 21783 →
Questions about this ZIP code
Where is ZIP code 21783?
21783 is in Smithsburg, Maryland, in Washington County, part of the Hagerstown-Martinsburg, MD-WV metropolitan area. Its published point location is 39.6520, -77.5526.
What county is 21783 in?
21783 spans 2 counties: Washington County and Frederick County. Most of it falls in Washington County, measured by overlapping land area — the county holding the most land in a ZIP code is not always the one holding the most residents.
What area code is 21783?
Smithsburg uses area codes 240, 227 and 301, from NANPA's telephone records.
What time zone is 21783 in?
21783 uses America/New_York.
How many people live in 21783?
About 9,910 people live in ZIP code 21783, in 3,632 households, at 208.2 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 21783?
$100,750 a year, against $103,678 across Maryland.
What ZIP codes are near 21783?
The closest are 21720 (1.7 mi), 21780 (4.5 mi), 21721 (4.5 mi), 21719 (4.6 mi) and 21742 (5.6 mi).
Is 21783 a PO Box ZIP code?
21783 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21783 ZIP Code — Smithsburg, Maryland (Washington County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21783
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21783.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.