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Where 21009 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 21009 into a pocket calculator and turn it upside down: GOOIZ — not quite a word, sorry.
- ➕ As a number, 21,009 = 3 × 47 × 149. Its digits add up to 12, a total 940 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101001000010001 - 🏠 Its numerical neighbours: 21005 (Aberdeen Proving Ground, MD, 9 mi away) and 21010 (Gunpowder, MD, 6 mi away).
- 🔄 Backwards, 21009 becomes 90012 — and that is a real ZIP code: Los Angeles, CA, 2,331 miles away.
- 👥 34 other ZIP codes are made of exactly the same digits (00912, 00921, 01029, 01092, 01902, 02019, …). The farthest-flung twin is 09102 in APO AE, a military post office, 4,022 miles away.
- 🧭 Farther north than 52% of all ZIP codes, and farther east than 84%.
- 🎯1,183 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21009 and you would come out at 39.47°S, 103.72°E — 856 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 57m of daylight. Shortest: 9h 23m.
- 📏 At 11.4 square miles of land, 21009 is bigger than 29% of ZIP codes — room for about 8.7 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 33,679This ZIP33,679 |
|---|---|
| Households | 12,940This ZIP12,940 |
| Housing units | 13,256This ZIP13,256 |
| Median age | 36.2This ZIP36.2Maryland39.4US 38.9 |
| Median household income | $121,660This ZIP$121,660Maryland$103,678US $80,734 |
| Median home value | $357,100This ZIP$357,100Maryland$419,900US $332,700 |
| Median gross rent | $1,838This ZIP$1,838Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 41.3%This ZIP41.3% |
| Mean commute | 30.7 minThis ZIP30.7 min |
| Population density | 2,953.8 / sq miThis ZIP2,953.8 / sq mi |
Business and tax activity
| Business establishments | 431This ZIP431 |
|---|---|
| Employees | 5,969This ZIP5,969 |
| Annual payroll | $301,692,000This ZIP$301,692,000 |
| Tax returns filed | 16,010This ZIP16,010 |
| Total adjusted gross income | $1,354,128,000This ZIP$1,354,128,000 |
Land area
| Land area | 11.40 sq miThis ZIP11.40 sq mi |
|---|---|
| Water area | 0.74 sq miThis ZIP0.74 sq mi |
Other place names in 21009
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21009
| ZIP | City | Distance |
|---|---|---|
21017 | Belcamp, MD | 2.7 mi |
21040 | Edgewood, MD | 2.9 mi |
21085 | Joppa, MD | 4.2 mi |
21001 | Aberdeen, MD | 5.0 mi |
21015 | Bel Air, MD | 5.0 mi |
21130 | Perryman, MD | 5.1 mi |
21010 | Gunpowder, MD | 5.6 mi |
21014 | Bel Air, MD | 5.7 mi |
21018 | Benson, MD | 6.0 mi |
21028 | Churchville, MD | 6.8 mi |
Find every ZIP code within 10 miles of 21009 →
Questions about this ZIP code
Where is ZIP code 21009?
21009 is in Abingdon, Maryland, in Harford County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.4715, -76.2846.
What county is 21009 in?
21009 lies in Harford County.
What area code is 21009?
Abingdon uses area codes 443, 410 and 667, from NANPA's telephone records.
What time zone is 21009 in?
21009 uses America/New_York.
How many people live in 21009?
About 33,679 people live in ZIP code 21009, in 12,940 households, at 2,953.8 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 21009?
$121,660 a year, against $103,678 across Maryland.
What ZIP codes are near 21009?
The closest are 21017 (2.7 mi), 21040 (2.9 mi), 21085 (4.2 mi), 21001 (5 mi) and 21015 (5 mi).
Is 21009 a PO Box ZIP code?
21009 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21009 ZIP Code — Abingdon, Maryland (Harford County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21009
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21009.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.