21644
ZIP 21644 is Ingleside, Maryland, in Queen Anne's County; area codes 667 and 410; Eastern time.
- Type
- Standard
- Time zone
- America/New_York
- County
- Queen Anne's
- Metro area
- Baltimore-Columbia-Towson, MD
- Population
- 81
- Coordinates
- 39.1172, -75.8744
Weather right now
Asking the National Weather Service…
Where 21644 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 21644 into a pocket calculator and turn it upside down: hhgIZ — not quite a word, sorry.
- ➕ As a number, 21,644 = 2 × 2 × 7 × 773. Its digits add up to 17, a total 2,133 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101010010001100 - 🏠 Its numerical neighbours: 21643 (Hurlock, MD, 33 mi away) and 21645 (Kennedyville, MD, 14 mi away).
- 🔄 Backwards, 21644 becomes 44612 — and that is a real ZIP code: Bolivar, OH, 315 miles away.
- 👥 33 other ZIP codes are made of exactly the same digits (12446, 12464, 14264, 14462, 14624, 14642, …). The farthest-flung twin is 64421 in Amazonia, MO, 1,015 miles away.
- 🧭 Farther north than 50% of all ZIP codes, and farther east than 85%.
- 🎯1,209 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21644 and you would come out at 39.12°S, 104.13°E — 824 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 55m of daylight. Shortest: 9h 25m.
- 📏 At 3.6 square miles of land, 21644 is bigger than 16% of ZIP codes — room for about 2.7 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 81This ZIP81 |
|---|---|
| Households | 21This ZIP21 |
| Housing units | 21This ZIP21 |
| Median age | 64.5This ZIP64.5Maryland39.4US 38.9 |
| Bachelor's degree or higher | 0.0% |
| Population density | 22.4 / sq miThis ZIP22.4 / sq mi |
Business and tax activity
| Business establishments | 4This ZIP4 |
|---|---|
| Employees | 40This ZIP40 |
| Annual payroll | $1,538,000This ZIP$1,538,000 |
Land area
| Land area | 3.62 sq miThis ZIP3.62 sq mi |
|---|---|
| Water area | 0.00 sq mi |
ZIP codes near 21644
| ZIP | City | Distance |
|---|---|---|
21607 | Barclay, MD | 1.5 mi |
21640 | Henderson, MD | 4.4 mi |
21623 | Church Hill, MD | 5.0 mi |
21649 | Marydel, MD | 5.2 mi |
21668 | Sudlersville, MD | 5.2 mi |
21670 | Templeville, MD | 6.0 mi |
19964 | Marydel, DE | 8.1 mi |
21636 | Goldsboro, MD | 8.2 mi |
21628 | Crumpton, MD | 8.4 mi |
21651 | Millington, MD | 9.6 mi |
Find every ZIP code within 10 miles of 21644 →
Questions about this ZIP code
Where is ZIP code 21644?
21644 is in Ingleside, Maryland, in Queen Anne's County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.1172, -75.8744.
What county is 21644 in?
21644 lies in Queen Anne's County.
What area code is 21644?
Ingleside uses area codes 667 and 410, from NANPA's telephone records.
What time zone is 21644 in?
21644 uses America/New_York.
How many people live in 21644?
About 81 people live in ZIP code 21644, in 21 households, at 22.4 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 21644?
The closest are 21607 (1.5 mi), 21640 (4.4 mi), 21623 (5 mi), 21649 (5.2 mi) and 21668 (5.2 mi).
Is 21644 a PO Box ZIP code?
21644 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21644 ZIP Code — Ingleside, Maryland (Queen Anne's County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21644
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21644.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.