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Where 21221 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 21221 into a pocket calculator and turn it upside down: IZZIZ — not quite a word, sorry.
- ➕ 21221 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 8, a total 251 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101001011100101 - 🏠 Its numerical neighbours: 21220 (Middle River, MD, 4 mi away) and 21222 (Dundalk, MD, 4 mi away).
- 🔄 Backwards, 21221 becomes 12212 — and that is a real ZIP code: Albany, NY, 273 miles away.
- 👥 7 other ZIP codes are made of exactly the same digits (11222, 12122, 12212, 21122, 21212, 22121, …). The farthest-flung twin is 12212 in Albany, NY, 273 miles away.
- 🧭 Farther north than 51% of all ZIP codes, and farther east than 84%.
- 🎯1,177 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21221 and you would come out at 39.29°S, 103.56°E — 856 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 56m of daylight. Shortest: 9h 24m.
- 📏 At 15.0 square miles of land, 21221 is bigger than 33% of ZIP codes — room for about 11 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 43,487This ZIP43,487 |
|---|---|
| Households | 17,286This ZIP17,286 |
| Housing units | 18,442This ZIP18,442 |
| Median age | 42.4This ZIP42.4Maryland39.4US 38.9 |
| Median household income | $67,340This ZIP$67,340Maryland$103,678US $80,734 |
| Median home value | $271,500This ZIP$271,500Maryland$419,900US $332,700 |
| Median gross rent | $1,310This ZIP$1,310Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 21.0%This ZIP21.0% |
| Mean commute | 29.5 minThis ZIP29.5 min |
| Population density | 2,893.0 / sq miThis ZIP2,893.0 / sq mi |
Business and tax activity
| Business establishments | 623This ZIP623 |
|---|---|
| Employees | 6,064This ZIP6,064 |
| Annual payroll | $284,596,000This ZIP$284,596,000 |
| Tax returns filed | 20,920This ZIP20,920 |
| Total adjusted gross income | $1,221,816,000This ZIP$1,221,816,000 |
Land area
| Land area | 15.03 sq miThis ZIP15.03 sq mi |
|---|---|
| Water area | 6.30 sq miThis ZIP6.30 sq mi |
Other place names in 21221
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21221
| ZIP | City | Distance |
|---|---|---|
21222 | Dundalk, MD | 3.7 mi |
21219 | Sparrows Point, MD | 4.3 mi |
21220 | Middle River, MD | 4.3 mi |
21237 | Rosedale, MD | 4.6 mi |
21224 | Baltimore, MD | 5.7 mi |
21052 | Fort Howard, MD | 6.0 mi |
21027 | Chase, MD | 6.1 mi |
21206 | Baltimore, MD | 6.3 mi |
21205 | Baltimore, MD | 6.8 mi |
21162 | White Marsh, MD | 7.0 mi |
Find every ZIP code within 10 miles of 21221 →
Questions about this ZIP code
Where is ZIP code 21221?
21221 is in Essex, Maryland, in Baltimore County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.2921, -76.4370.
What county is 21221 in?
21221 lies in Baltimore County.
What area code is 21221?
Essex uses area codes 443, 410 and 667, from NANPA's telephone records.
What time zone is 21221 in?
21221 uses America/New_York.
How many people live in 21221?
About 43,487 people live in ZIP code 21221, in 17,286 households, at 2,893.0 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 21221?
$67,340 a year, against $103,678 across Maryland.
What ZIP codes are near 21221?
The closest are 21222 (3.7 mi), 21219 (4.3 mi), 21220 (4.3 mi), 21237 (4.6 mi) and 21224 (5.7 mi).
Is 21221 a PO Box ZIP code?
21221 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21221 ZIP Code — Essex, Maryland (Baltimore County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21221
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21221.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.