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Where 21234 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 21234 into a pocket calculator and turn it upside down: hEZIZ — not quite a word, sorry.
- ➕ As a number, 21,234 = 2 × 3 × 3539. Its digits add up to 12, a total 940 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101001011110010 - 🏠 Its numerical neighbours: 21233 (Baltimore, MD, 8 mi away) and 21235 (Baltimore, MD, 9 mi away).
- 🔄 Backwards, 21234 becomes 43212 — and that is a real ZIP code: Columbus, OH, 349 miles away.
- 👥 27 other ZIP codes are made of exactly the same digits (12234, 12243, 12423, 12432, 13224, 14223, …). The farthest-flung twin is 34212 in Bradenton, FL, 889 miles away.
- 🧭 Farther north than 52% of all ZIP codes, and farther east than 83%.
- 🎯1,171 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21234 and you would come out at 39.39°S, 103.47°E — 864 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 57m of daylight. Shortest: 9h 23m.
- 📏 At 13.4 square miles of land, 21234 is bigger than 31% of ZIP codes — room for about 10 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 66,334This ZIP66,334 |
|---|---|
| Households | 27,639This ZIP27,639 |
| Housing units | 29,649This ZIP29,649 |
| Median age | 40.5This ZIP40.5Maryland39.4US 38.9 |
| Median household income | $83,517This ZIP$83,517Maryland$103,678US $80,734 |
| Median home value | $288,100This ZIP$288,100Maryland$419,900US $332,700 |
| Median gross rent | $1,587This ZIP$1,587Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 36.4%This ZIP36.4% |
| Mean commute | 27.4 minThis ZIP27.4 min |
| Population density | 4,967.4 / sq miThis ZIP4,967.4 / sq mi |
Business and tax activity
| Business establishments | 991This ZIP991 |
|---|---|
| Employees | 10,461This ZIP10,461 |
| Annual payroll | $425,615,000This ZIP$425,615,000 |
| Tax returns filed | 33,940This ZIP33,940 |
| Total adjusted gross income | $2,198,296,000This ZIP$2,198,296,000 |
Land area
| Land area | 13.35 sq miThis ZIP13.35 sq mi |
|---|---|
| Water area | 0.00 sq miThis ZIP0.00 sq mi |
Counties 21234 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 | 92.7% |
| Baltimore city | 7.3% |
Other place names in 21234
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21234
| ZIP | City | Distance |
|---|---|---|
21286 | Towson, MD | 2.6 mi |
21236 | Nottingham, MD | 2.6 mi |
21214 | Baltimore, MD | 3.3 mi |
21239 | Baltimore, MD | 3.5 mi |
21284 | Towson, MD | 3.8 mi |
21206 | Baltimore, MD | 3.8 mi |
21251 | Baltimore, MD | 4.0 mi |
21057 | Glen Arm, MD | 4.0 mi |
21237 | Rosedale, MD | 4.1 mi |
21252 | Towson, MD | 4.2 mi |
Find every ZIP code within 10 miles of 21234 →
Questions about this ZIP code
Where is ZIP code 21234?
21234 is in Parkville, Maryland, in Baltimore County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.3933, -76.5318.
What county is 21234 in?
21234 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 21234?
Parkville uses area codes 410, 443 and 667, from NANPA's telephone records.
What time zone is 21234 in?
21234 uses America/New_York.
How many people live in 21234?
About 66,334 people live in ZIP code 21234, in 27,639 households, at 4,967.4 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 21234?
$83,517 a year, against $103,678 across Maryland.
What ZIP codes are near 21234?
The closest are 21286 (2.6 mi), 21236 (2.6 mi), 21214 (3.3 mi), 21239 (3.5 mi) and 21284 (3.8 mi).
Is 21234 a PO Box ZIP code?
21234 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21234 ZIP Code — Parkville, Maryland (Baltimore County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21234
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21234.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.