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Where 21075 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 21075 into a pocket calculator and turn it upside down: SLOIZ — not quite a word, sorry.
- ➕ As a number, 21,075 = 3 × 5 × 5 × 281. Its digits add up to 15, a total 1,657 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101001001010011 - 🏠 Its numerical neighbours: 21074 (Hampstead, MD, 29 mi away) and 21076 (Hanover, MD, 3 mi away).
- 🔄 Backwards, 21075 becomes 57012 — and that is a real ZIP code: Canistota, SD, 1,103 miles away.
- 👥 65 other ZIP codes are made of exactly the same digits (01257, 01527, 01752, 02571, 02715, 07512, …). The farthest-flung twin is 75102 in Barry, TX, 1,217 miles away.
- 🧭 Farther north than 50% 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 21075 and you would come out at 39.20°S, 103.25°E — 867 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 56m of daylight. Shortest: 9h 24m.
- 📏 At 13.9 square miles of land, 21075 is bigger than 32% of ZIP codes — room for about 11 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 37,363This ZIP37,363 |
|---|---|
| Households | 13,038This ZIP13,038 |
| Housing units | 13,443This ZIP13,443 |
| Median age | 34.1This ZIP34.1Maryland39.4US 38.9 |
| Median household income | $135,303This ZIP$135,303Maryland$103,678US $80,734 |
| Median home value | $455,300This ZIP$455,300Maryland$419,900US $332,700 |
| Median gross rent | $2,183This ZIP$2,183Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 59.9%This ZIP59.9% |
| Mean commute | 28.1 minThis ZIP28.1 min |
| Population density | 2,682.0 / sq miThis ZIP2,682.0 / sq mi |
Business and tax activity
| Business establishments | 919This ZIP919 |
|---|---|
| Employees | 17,627This ZIP17,627 |
| Annual payroll | $1,346,245,000This ZIP$1,346,245,000 |
| Tax returns filed | 17,660This ZIP17,660 |
| Total adjusted gross income | $1,719,757,000This ZIP$1,719,757,000 |
Land area
| Land area | 13.93 sq miThis ZIP13.93 sq mi |
|---|---|
| Water area | 0.06 sq miThis ZIP0.06 sq mi |
Other place names in 21075
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21075
| ZIP | City | Distance |
|---|---|---|
21076 | Hanover, MD | 2.6 mi |
21077 | Harmans, MD | 4.1 mi |
21045 | Columbia, MD | 4.2 mi |
21250 | Baltimore, MD | 4.2 mi |
20794 | Jessup, MD | 4.3 mi |
21043 | Ellicott City, MD | 4.5 mi |
21227 | Halethorpe, MD | 4.6 mi |
21090 | Linthicum Heights, MD | 4.6 mi |
21240 | Baltimore, MD | 4.7 mi |
21228 | Catonsville, MD | 4.8 mi |
Find every ZIP code within 10 miles of 21075 →
Questions about this ZIP code
Where is ZIP code 21075?
21075 is in Elkridge, Maryland, in Howard County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.2031, -76.7507.
What county is 21075 in?
21075 lies in Howard County.
What area code is 21075?
Elkridge uses area codes 410, 443 and 667, from NANPA's telephone records.
What time zone is 21075 in?
21075 uses America/New_York.
How many people live in 21075?
About 37,363 people live in ZIP code 21075, in 13,038 households, at 2,682.0 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 21075?
$135,303 a year, against $103,678 across Maryland.
What ZIP codes are near 21075?
The closest are 21076 (2.6 mi), 21077 (4.1 mi), 21045 (4.2 mi), 21250 (4.2 mi) and 20794 (4.3 mi).
Is 21075 a PO Box ZIP code?
21075 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21075 ZIP Code — Elkridge, Maryland (Howard County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21075
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21075.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.