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Where 21120 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 21120 into a pocket calculator and turn it upside down: OZIIZ — not quite a word, sorry.
- ➕ As a number, 21,120 = 2 × 2 × 2 × 2 × 2 × 2 × 2 × 3 × 5 × 11. Its digits add up to 6, a total 90 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101001010000000 - 🏠 Its numerical neighbours: 21117 (Owings Mills, MD, 16 mi away) and 21122 (Pasadena, MD, 38 mi away).
- 🔄 Backwards, 21120 becomes 02112 — and that is a real ZIP code: Boston, MA, 348 miles away.
- 👥 19 other ZIP codes are made of exactly the same digits (02112, 02121, 02211, 10122, 10212, 11022, …). The farthest-flung twin is 02112 in Boston, MA, 348 miles away.
- 🧭 Farther north than 53% of all ZIP codes, and farther east than 83%.
- 🎯1,161 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21120 and you would come out at 39.65°S, 103.33°E — 880 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 59m of daylight. Shortest: 9h 22m.
- 📏 At 42.0 square miles of land, 21120 is bigger than 55% of ZIP codes — room for about 32 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 7,440This ZIP7,440 |
|---|---|
| Households | 2,599This ZIP2,599 |
| Housing units | 2,622This ZIP2,622 |
| Median age | 40.8This ZIP40.8Maryland39.4US 38.9 |
| Median household income | $162,052This ZIP$162,052Maryland$103,678US $80,734 |
| Median home value | $580,900This ZIP$580,900Maryland$419,900US $332,700 |
| Median gross rent | $1,271This ZIP$1,271Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 64.2%This ZIP64.2% |
| Mean commute | 36.9 minThis ZIP36.9 min |
| Population density | 177.2 / sq miThis ZIP177.2 / sq mi |
Business and tax activity
| Business establishments | 174This ZIP174 |
|---|---|
| Employees | 1,026This ZIP1,026 |
| Annual payroll | $55,113,000This ZIP$55,113,000 |
| Tax returns filed | 3,570This ZIP3,570 |
| Total adjusted gross income | $519,431,000This ZIP$519,431,000 |
Land area
| Land area | 42.00 sq miThis ZIP42.00 sq mi |
|---|---|
| Water area | 0.72 sq miThis ZIP0.72 sq mi |
ZIP codes near 21120
| ZIP | City | Distance |
|---|---|---|
21053 | Freeland, MD | 4.1 mi |
21105 | Maryland Line, MD | 4.9 mi |
21161 | White Hall, MD | 5.9 mi |
21152 | Sparks Glencoe, MD | 6.3 mi |
21111 | Monkton, MD | 6.7 mi |
17349 | New Freedom, PA | 6.9 mi |
17355 | Railroad, PA | 7.9 mi |
17361 | Shrewsbury, PA | 8.3 mi |
21155 | Upperco, MD | 8.6 mi |
21074 | Hampstead, MD | 8.9 mi |
Find every ZIP code within 10 miles of 21120 →
Questions about this ZIP code
Where is ZIP code 21120?
21120 is in Parkton, Maryland, in Baltimore County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.6462, -76.6749.
What county is 21120 in?
21120 lies in Baltimore County.
What area code is 21120?
Parkton uses area codes 443, 667 and 410, from NANPA's telephone records.
What time zone is 21120 in?
21120 uses America/New_York.
How many people live in 21120?
About 7,440 people live in ZIP code 21120, in 2,599 households, at 177.2 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 21120?
$162,052 a year, against $103,678 across Maryland.
What ZIP codes are near 21120?
The closest are 21053 (4.1 mi), 21105 (4.9 mi), 21161 (5.9 mi), 21152 (6.3 mi) and 21111 (6.7 mi).
Is 21120 a PO Box ZIP code?
21120 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21120 ZIP Code — Parkton, Maryland (Baltimore County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21120
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21120.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.