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Where 21237 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 21237 into a pocket calculator and turn it upside down: LEZIZ — not quite a word, sorry.
- ➕ As a number, 21,237 = 3 × 7079. Its digits add up to 15, a total 1,657 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101001011110101 - 🏠 Its numerical neighbours: 21236 (Nottingham, MD, 3 mi away) and 21239 (Baltimore, MD, 5 mi away).
- 🔄 Backwards, 21237 becomes 73212, which is not a ZIP code at all.
- 👥 31 other ZIP codes are made of exactly the same digits (12237, 12723, 12732, 17223, 17232, 17322, …). The farthest-flung twin is 73122 in Oklahoma City, OK, 1,185 miles away.
- 🧭 Farther north than 51% of all ZIP codes, and farther east than 83%.
- 🎯1,173 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21237 and you would come out at 39.34°S, 103.50°E — 860 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 57m of daylight. Shortest: 9h 23m.
- 📏 At 11.3 square miles of land, 21237 is bigger than 29% of ZIP codes — room for about 8.5 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 31,425This ZIP31,425 |
|---|---|
| Households | 12,417This ZIP12,417 |
| Housing units | 13,121This ZIP13,121 |
| Median age | 41.8This ZIP41.8Maryland39.4US 38.9 |
| Median household income | $91,693This ZIP$91,693Maryland$103,678US $80,734 |
| Median home value | $295,600This ZIP$295,600Maryland$419,900US $332,700 |
| Median gross rent | $1,606This ZIP$1,606Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 26.5%This ZIP26.5% |
| Mean commute | 28.7 minThis ZIP28.7 min |
| Population density | 2,792.6 / sq miThis ZIP2,792.6 / sq mi |
Business and tax activity
| Business establishments | 841This ZIP841 |
|---|---|
| Employees | 18,680This ZIP18,680 |
| Annual payroll | $1,382,395,000This ZIP$1,382,395,000 |
| Tax returns filed | 15,880This ZIP15,880 |
| Total adjusted gross income | $1,002,540,000This ZIP$1,002,540,000 |
Land area
| Land area | 11.25 sq miThis ZIP11.25 sq mi |
|---|---|
| Water area | 0.24 sq miThis ZIP0.24 sq mi |
Counties 21237 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Baltimore County | 93.7% |
| Baltimore city | 6.3% |
Other place names in 21237
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21237
| ZIP | City | Distance |
|---|---|---|
21206 | Baltimore, MD | 2.3 mi |
21236 | Nottingham, MD | 3.3 mi |
21214 | Baltimore, MD | 3.8 mi |
21234 | Parkville, MD | 4.1 mi |
21205 | Baltimore, MD | 4.6 mi |
21251 | Baltimore, MD | 4.6 mi |
21221 | Essex, MD | 4.6 mi |
21213 | Baltimore, MD | 4.8 mi |
21128 | Perry Hall, MD | 5.0 mi |
21239 | Baltimore, MD | 5.2 mi |
Find every ZIP code within 10 miles of 21237 →
Questions about this ZIP code
Where is ZIP code 21237?
21237 is in Rosedale, Maryland, in Baltimore County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.3415, -76.4953.
What county is 21237 in?
21237 spans 2 counties: Baltimore County and Baltimore city. Most of it falls in Baltimore 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 21237?
Rosedale uses area codes 410, 443 and 667, from NANPA's telephone records.
What time zone is 21237 in?
21237 uses America/New_York.
How many people live in 21237?
About 31,425 people live in ZIP code 21237, in 12,417 households, at 2,792.6 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 21237?
$91,693 a year, against $103,678 across Maryland.
What ZIP codes are near 21237?
The closest are 21206 (2.3 mi), 21236 (3.3 mi), 21214 (3.8 mi), 21234 (4.1 mi) and 21205 (4.6 mi).
Is 21237 a PO Box ZIP code?
21237 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21237 ZIP Code — Rosedale, Maryland (Baltimore County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21237
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21237.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.