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Where 21071 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 21071 into a pocket calculator and turn it upside down: ILOIZ — not quite a word, sorry.
- ➕ As a number, 21,071 = 19 × 1109. Its digits add up to 11, a total 714 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101001001001111 - 🏠 Its numerical neighbours: 21065 (Hunt Valley, MD, 8 mi away) and 21074 (Hampstead, MD, 10 mi away).
- 🔄 Backwards, 21071 becomes 17012 — and that is a real ZIP code: Camp Hill, PA, 53 miles away.
- 👥 40 other ZIP codes are made of exactly the same digits (01721, 02117, 02171, 07112, 10172, 10271, …). The farthest-flung twin is 71102 in Shreveport, LA, 1,057 miles away.
- 🧭 Farther north than 52% of all ZIP codes, and farther east than 82%.
- 🎯1,155 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21071 and you would come out at 39.48°S, 103.19°E — 880 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 58m of daylight. Shortest: 9h 23m.
- 📏 At 1.5 square miles of land, 21071 is bigger than 10% of ZIP codes — room for about 1.1 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 404This ZIP404 |
|---|---|
| Households | 130This ZIP130 |
| Housing units | 130This ZIP130 |
| Median age | 33.0This ZIP33.0Maryland39.4US 38.9 |
| Median household income | $213,500This ZIP$213,500Maryland$103,678US $80,734 |
| Median home value | $450,500This ZIP$450,500Maryland$419,900US $332,700 |
| Bachelor's degree or higher | 83.3%This ZIP83.3% |
| Population density | 269.2 / sq miThis ZIP269.2 / sq mi |
Business and tax activity
| Business establishments | 32This ZIP32 |
|---|---|
| Employees | 606This ZIP606 |
| Annual payroll | $35,119,000This ZIP$35,119,000 |
Land area
| Land area | 1.50 sq miThis ZIP1.50 sq mi |
|---|---|
| Water area | 0.00 sq miThis ZIP0.00 sq mi |
ZIP codes near 21071
| ZIP | City | Distance |
|---|---|---|
21020 | Boring, MD | 2.6 mi |
21136 | Reisterstown, MD | 3.6 mi |
21117 | Owings Mills, MD | 4.3 mi |
21023 | Butler, MD | 4.6 mi |
21048 | Finksburg, MD | 6.2 mi |
21155 | Upperco, MD | 6.2 mi |
21030 | Cockeysville, MD | 6.3 mi |
21133 | Randallstown, MD | 7.3 mi |
21153 | Stevenson, MD | 7.4 mi |
21031 | Hunt Valley, MD | 8.1 mi |
Find every ZIP code within 10 miles of 21071 →
Questions about this ZIP code
Where is ZIP code 21071?
21071 is in Glyndon, Maryland, in Baltimore County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.4838, -76.8104.
What county is 21071 in?
21071 lies in Baltimore County.
What area code is 21071?
Glyndon uses area codes 443, 410 and 667, from NANPA's telephone records.
What time zone is 21071 in?
21071 uses America/New_York.
How many people live in 21071?
About 404 people live in ZIP code 21071, in 130 households, at 269.2 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 21071?
$213,500 a year, against $103,678 across Maryland.
What ZIP codes are near 21071?
The closest are 21020 (2.6 mi), 21136 (3.6 mi), 21117 (4.3 mi), 21023 (4.6 mi) and 21048 (6.2 mi).
Is 21071 a PO Box ZIP code?
21071 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21071 ZIP Code — Glyndon, Maryland (Baltimore County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21071
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21071.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.