21648
ZIP 21648 is Madison, Maryland, in Dorchester County; area codes 443, 667 and 410; Eastern time.
- Type
- Standard
- Time zone
- America/New_York
- County
- Dorchester
- Metro area
- Cambridge, MD
- Population
- 172
- Coordinates
- 38.5088, -76.2398
Weather right now
Asking the National Weather Service…
Where 21648 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 21648 into a pocket calculator and turn it upside down: BhgIZ — not quite a word, sorry.
- ➕ As a number, 21,648 = 2 × 2 × 2 × 2 × 3 × 11 × 41. Its digits add up to 21, a total 2,594 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101010010010000 - 🏠 Its numerical neighbours: 21647 (Mcdaniel, MD, 20 mi away) and 21649 (Marydel, MD, 50 mi away).
- 🔄 Backwards, 21648 becomes 84612, which is not a ZIP code at all.
- 👥 53 other ZIP codes are made of exactly the same digits (12468, 12486, 12846, 12864, 14826, 16248, …). The farthest-flung twin is 86412 in Hualapai, AZ, 2,073 miles away.
- 🧭 Farther south than 55% of all ZIP codes, and farther east than 84%.
- 🎯1,197 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21648 and you would come out at 38.51°S, 103.76°E — 818 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 51m of daylight. Shortest: 9h 28m.
- 📏 At 9.4 square miles of land, 21648 is bigger than 26% of ZIP codes — room for about 7.1 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 172This ZIP172 |
|---|---|
| Households | 70This ZIP70 |
| Housing units | 89This ZIP89 |
| Median age | 61.4This ZIP61.4Maryland39.4US 38.9 |
| Median home value | $195,000This ZIP$195,000Maryland$419,900US $332,700 |
| Bachelor's degree or higher | 13.0%This ZIP13.0% |
| Mean commute | 23.7 minThis ZIP23.7 min |
| Population density | 18.3 / sq miThis ZIP18.3 / sq mi |
Land area
| Land area | 9.38 sq miThis ZIP9.38 sq mi |
|---|---|
| Water area | 4.69 sq miThis ZIP4.69 sq mi |
Other place names in 21648
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21648
| ZIP | City | Distance |
|---|---|---|
21677 | Woolford, MD | 4.4 mi |
21669 | Taylors Island, MD | 4.4 mi |
21622 | Church Creek, MD | 7.8 mi |
21613 | Cambridge, MD | 8.7 mi |
21654 | Oxford, MD | 13.8 mi |
20657 | Lusby, MD | 13.8 mi |
21671 | Tilghman, MD | 13.9 mi |
21673 | Trappe, MD | 14.1 mi |
21662 | Royal Oak, MD | 14.4 mi |
21652 | Neavitt, MD | 14.7 mi |
Find every ZIP code within 10 miles of 21648 →
Questions about this ZIP code
Where is ZIP code 21648?
21648 is in Madison, Maryland, in Dorchester County, part of the Cambridge, MD micropolitan area. Its published point location is 38.5088, -76.2398.
What county is 21648 in?
21648 lies in Dorchester County.
What area code is 21648?
Madison uses area codes 443, 667 and 410, from NANPA's telephone records.
What time zone is 21648 in?
21648 uses America/New_York.
How many people live in 21648?
About 172 people live in ZIP code 21648, in 70 households, at 18.3 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 21648?
The closest are 21677 (4.4 mi), 21669 (4.4 mi), 21622 (7.8 mi), 21613 (8.7 mi) and 21654 (13.8 mi).
Is 21648 a PO Box ZIP code?
21648 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21648 ZIP Code — Madison, Maryland (Dorchester County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21648
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21648.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.