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Where 21040 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 21040 into a pocket calculator and turn it upside down: OhOIZ — not quite a word, sorry.
- ➕ As a number, 21,040 = 2 × 2 × 2 × 2 × 5 × 263. Its digits add up to 7, a total 150 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101001000110000 - 🏠 Its numerical neighbours: 21037 (Edgewater, MD, 38 mi away) and 21041 (Ellicott City, MD, 38 mi away).
- 🔄 Backwards, 21040 becomes 04012, which is not a ZIP code at all.
- 👥 22 other ZIP codes are made of exactly the same digits (01240, 01420, 02041, 02140, 04021, 04102, …). The farthest-flung twin is 42001 in Paducah, KY, 694 miles away.
- 🧭 Farther north than 52% of all ZIP codes, and farther east than 84%.
- 🎯1,184 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21040 and you would come out at 39.43°S, 103.72°E — 854 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 57m of daylight. Shortest: 9h 23m.
- 📏 At 9.8 square miles of land, 21040 is bigger than 27% of ZIP codes — room for about 7.5 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 24,960This ZIP24,960 |
|---|---|
| Households | 9,795This ZIP9,795 |
| Housing units | 10,241This ZIP10,241 |
| Median age | 36.4This ZIP36.4Maryland39.4US 38.9 |
| Median household income | $81,704This ZIP$81,704Maryland$103,678US $80,734 |
| Median home value | $238,000This ZIP$238,000Maryland$419,900US $332,700 |
| Median gross rent | $1,360This ZIP$1,360Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 22.8%This ZIP22.8% |
| Mean commute | 31.3 minThis ZIP31.3 min |
| Population density | 2,543.3 / sq miThis ZIP2,543.3 / sq mi |
Business and tax activity
| Business establishments | 322This ZIP322 |
|---|---|
| Employees | 5,960This ZIP5,960 |
| Annual payroll | $314,911,000This ZIP$314,911,000 |
| Tax returns filed | 12,020This ZIP12,020 |
| Total adjusted gross income | $623,579,000This ZIP$623,579,000 |
Land area
| Land area | 9.81 sq miThis ZIP9.81 sq mi |
|---|---|
| Water area | 1.16 sq miThis ZIP1.16 sq mi |
Other place names in 21040
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21040
| ZIP | City | Distance |
|---|---|---|
21010 | Gunpowder, MD | 2.7 mi |
21009 | Abingdon, MD | 2.9 mi |
21017 | Belcamp, MD | 4.1 mi |
21085 | Joppa, MD | 4.1 mi |
21130 | Perryman, MD | 5.9 mi |
21156 | Upper Falls, MD | 6.4 mi |
21027 | Chase, MD | 6.6 mi |
21001 | Aberdeen, MD | 6.8 mi |
21087 | Kingsville, MD | 7.0 mi |
21162 | White Marsh, MD | 7.1 mi |
Find every ZIP code within 10 miles of 21040 →
Questions about this ZIP code
Where is ZIP code 21040?
21040 is in Edgewood, Maryland, in Harford County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.4299, -76.2836.
What county is 21040 in?
21040 lies in Harford County.
What area code is 21040?
Edgewood uses area codes 443, 410 and 667, from NANPA's telephone records.
What time zone is 21040 in?
21040 uses America/New_York.
How many people live in 21040?
About 24,960 people live in ZIP code 21040, in 9,795 households, at 2,543.3 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 21040?
$81,704 a year, against $103,678 across Maryland.
What ZIP codes are near 21040?
The closest are 21010 (2.7 mi), 21009 (2.9 mi), 21017 (4.1 mi), 21085 (4.1 mi) and 21130 (5.9 mi).
Is 21040 a PO Box ZIP code?
21040 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21040 ZIP Code — Edgewood, Maryland (Harford County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21040
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21040.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.