21012
ZIP 21012 is Arnold, Maryland, in Anne Arundel County; area codes 443, 410 and 667; Eastern time.
- Type
- Standard
- Time zone
- America/New_York
- County
- Anne Arundel
- Metro area
- Baltimore-Columbia-Towson, MD
- Population
- 22,570
- Coordinates
- 39.0466, -76.4956
Weather right now
Asking the National Weather Service…
Where 21012 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 21012 into a pocket calculator and turn it upside down: ZIOIZ — not quite a word, sorry.
- ⇆21012 reads the same backwards. It is one of only 412 palindromic ZIP codes.
- ➕ As a number, 21,012 = 2 × 2 × 3 × 17 × 103. Its digits add up to 6, a total 90 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101001000010100 - 🏠 Its numerical neighbours: 21010 (Gunpowder, MD, 26 mi away) and 21013 (Baldwin, MD, 32 mi 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, 365 miles away.
- 🧭 Farther south than 50% of all ZIP codes, and farther east than 83%.
- 🎯1,177 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21012 and you would come out at 39.05°S, 103.50°E — 849 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 55m of daylight. Shortest: 9h 25m.
- 📏 At 9.8 square miles of land, 21012 is bigger than 27% of ZIP codes — room for about 7.4 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 22,570This ZIP22,570 |
|---|---|
| Households | 8,275This ZIP8,275 |
| Housing units | 8,542This ZIP8,542 |
| Median age | 38.0This ZIP38.0Maryland39.4US 38.9 |
| Median household income | $139,432This ZIP$139,432Maryland$103,678US $80,734 |
| Median home value | $563,800This ZIP$563,800Maryland$419,900US $332,700 |
| Median gross rent | $2,166This ZIP$2,166Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 57.5%This ZIP57.5% |
| Mean commute | 28.2 minThis ZIP28.2 min |
| Population density | 2,308.0 / sq miThis ZIP2,308.0 / sq mi |
Business and tax activity
| Business establishments | 404This ZIP404 |
|---|---|
| Employees | 3,428This ZIP3,428 |
| Annual payroll | $151,689,000This ZIP$151,689,000 |
| Tax returns filed | 10,980This ZIP10,980 |
| Total adjusted gross income | $1,529,404,000This ZIP$1,529,404,000 |
Land area
| Land area | 9.78 sq miThis ZIP9.78 sq mi |
|---|---|
| Water area | 2.79 sq miThis ZIP2.79 sq mi |
Other place names in 21012
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21012
| ZIP | City | Distance |
|---|---|---|
21405 | Annapolis, MD | 3.1 mi |
21409 | Annapolis, MD | 3.4 mi |
21056 | Gibson Island, MD | 3.9 mi |
21146 | Severna Park, MD | 4.1 mi |
21402 | Annapolis, MD | 4.2 mi |
21122 | Pasadena, MD | 4.7 mi |
21404 | Annapolis, MD | 4.7 mi |
21401 | Annapolis, MD | 5.1 mi |
21032 | Crownsville, MD | 6.0 mi |
21403 | Annapolis, MD | 7.2 mi |
Find every ZIP code within 10 miles of 21012 →
Questions about this ZIP code
Where is ZIP code 21012?
21012 is in Arnold, Maryland, in Anne Arundel County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.0466, -76.4956.
What county is 21012 in?
21012 lies in Anne Arundel County.
What area code is 21012?
Arnold uses area codes 443, 410 and 667, from NANPA's telephone records.
What time zone is 21012 in?
21012 uses America/New_York.
How many people live in 21012?
About 22,570 people live in ZIP code 21012, in 8,275 households, at 2,308.0 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 21012?
$139,432 a year, against $103,678 across Maryland.
What ZIP codes are near 21012?
The closest are 21405 (3.1 mi), 21409 (3.4 mi), 21056 (3.9 mi), 21146 (4.1 mi) and 21402 (4.2 mi).
Is 21012 a PO Box ZIP code?
21012 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21012 ZIP Code — Arnold, Maryland (Anne Arundel County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21012
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21012.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.