21240
ZIP 21240 is in Baltimore, Maryland, in Anne Arundel County; area codes 410, 443 and 667; Eastern time. Baltimore has 42 ZIP codes in all.
- Type
- Standard
- Time zone
- America/New_York
- County
- Anne Arundel
- Metro area
- Baltimore-Columbia-Towson, MD
- Population
- 0
- Coordinates
- 39.1748, -76.6718
Weather right now
Asking the National Weather Service…
Where 21240 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 21240 into a pocket calculator and turn it upside down: OhZIZ — not quite a word, sorry.
- ➕ As a number, 21,240 = 2 × 2 × 2 × 3 × 3 × 5 × 59. Its digits add up to 9, a total 375 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101001011111000 - 🏠 Its numerical neighbours: 21239 (Baltimore, MD, 14 mi away) and 21241 (Baltimore, MD, 8 mi away).
- 🔄 Backwards, 21240 becomes 04212 — and that is a real ZIP code: Auburn, ME, 480 miles away.
- 👥 43 other ZIP codes are made of exactly the same digits (01224, 01242, 02124, 02142, 02241, 02421, …). The farthest-flung twin is 42021 in Arlington, KY, 690 miles away.
- 🧭 Farther north than 50% of all ZIP codes, and farther east than 83%.
- 🎯1,166 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21240 and you would come out at 39.17°S, 103.33°E — 862 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 56m of daylight. Shortest: 9h 24m.
- 📏 At 4.5 square miles of land, 21240 is bigger than 18% of ZIP codes — room for about 3.4 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 0 |
|---|---|
| Households | 0 |
| Housing units | 0 |
| Population density | 0.0 / sq mi |
Business and tax activity
| Business establishments | 118This ZIP118 |
|---|---|
| Employees | 10,902This ZIP10,902 |
| Annual payroll | $707,188,000This ZIP$707,188,000 |
Land area
| Land area | 4.51 sq miThis ZIP4.51 sq mi |
|---|---|
| Water area | 0.00 sq mi |
ZIP codes near 21240
| ZIP | City | Distance |
|---|---|---|
21077 | Harmans, MD | 1.9 mi |
21061 | Glen Burnie, MD | 2.3 mi |
21090 | Linthicum Heights, MD | 2.4 mi |
21076 | Hanover, MD | 2.8 mi |
21144 | Severn, MD | 3.8 mi |
21227 | Halethorpe, MD | 4.5 mi |
21225 | Brooklyn, MD | 4.6 mi |
21075 | Elkridge, MD | 4.7 mi |
21060 | Glen Burnie, MD | 5.0 mi |
21250 | Baltimore, MD | 6.0 mi |
Find every ZIP code within 10 miles of 21240 →
Questions about this ZIP code
Where is ZIP code 21240?
21240 is in Baltimore, Maryland, in Anne Arundel County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.1748, -76.6718.
What county is 21240 in?
21240 lies in Anne Arundel County.
What area code is 21240?
Baltimore uses area codes 410, 443 and 667, from NANPA's telephone records.
What time zone is 21240 in?
21240 uses America/New_York.
How many people live in 21240?
About 0 people live in ZIP code 21240. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.
What ZIP codes are near 21240?
The closest are 21077 (1.9 mi), 21061 (2.3 mi), 21090 (2.4 mi), 21076 (2.8 mi) and 21144 (3.8 mi).
Is 21240 a PO Box ZIP code?
21240 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21240 ZIP Code — Baltimore, Maryland (Anne Arundel County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21240
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21240.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.