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Where 21207 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 21207 into a pocket calculator and turn it upside down: LOZIZ — not quite a word, sorry.
- ➕ As a number, 21,207 = 3 × 7069. Its digits add up to 12, a total 940 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101001011010111 - 🏠 Its numerical neighbours: 21206 (Baltimore, MD, 10 mi away) and 21208 (Pikesville, MD, 4 mi away).
- 🔄 Backwards, 21207 becomes 70212, which is not a ZIP code at all.
- 👥 37 other ZIP codes are made of exactly the same digits (01227, 02127, 02217, 02712, 02721, 10272, …). The farthest-flung twin is 70122 in New Orleans, LA, 993 miles away.
- 🧭 Farther north than 51% of all ZIP codes, and farther east than 83%.
- 🎯1,162 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21207 and you would come out at 39.32°S, 103.28°E — 870 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 57m of daylight. Shortest: 9h 24m.
- 📏 At 10.3 square miles of land, 21207 is bigger than 28% of ZIP codes — room for about 7.9 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 47,099This ZIP47,099 |
|---|---|
| Households | 18,976This ZIP18,976 |
| Housing units | 20,199This ZIP20,199 |
| Median age | 39.5This ZIP39.5Maryland39.4US 38.9 |
| Median household income | $67,060This ZIP$67,060Maryland$103,678US $80,734 |
| Median home value | $260,300This ZIP$260,300Maryland$419,900US $332,700 |
| Median gross rent | $1,432This ZIP$1,432Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 29.3%This ZIP29.3% |
| Mean commute | 29.7 minThis ZIP29.7 min |
| Population density | 4,552.8 / sq miThis ZIP4,552.8 / sq mi |
Business and tax activity
| Business establishments | 498This ZIP498 |
|---|---|
| Employees | 6,909This ZIP6,909 |
| Annual payroll | $334,088,000This ZIP$334,088,000 |
| Tax returns filed | 23,120This ZIP23,120 |
| Total adjusted gross income | $1,220,853,000This ZIP$1,220,853,000 |
Land area
| Land area | 10.35 sq miThis ZIP10.35 sq mi |
|---|---|
| Water area | 0.04 sq miThis ZIP0.04 sq mi |
Counties 21207 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Baltimore County | 72.0% |
| Baltimore city | 28.0% |
Other place names in 21207
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21207
| ZIP | City | Distance |
|---|---|---|
21215 | Baltimore, MD | 2.5 mi |
21216 | Baltimore, MD | 2.7 mi |
21229 | Baltimore, MD | 3.1 mi |
21244 | Windsor Mill, MD | 3.1 mi |
21282 | Pikesville, MD | 3.5 mi |
21228 | Catonsville, MD | 3.9 mi |
21208 | Pikesville, MD | 4.1 mi |
21211 | Baltimore, MD | 4.3 mi |
21217 | Baltimore, MD | 4.5 mi |
21223 | Baltimore, MD | 4.5 mi |
Find every ZIP code within 10 miles of 21207 →
Questions about this ZIP code
Where is ZIP code 21207?
21207 is in Gwynn Oak, Maryland, in Baltimore County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.3242, -76.7195.
What county is 21207 in?
21207 spans 2 counties: Baltimore County and Baltimore city. Most of it falls in Baltimore County, measured by overlapping land area — the county holding the most land in a ZIP code is not always the one holding the most residents.
What area code is 21207?
Gwynn Oak uses area codes 410, 443 and 667, from NANPA's telephone records.
What time zone is 21207 in?
21207 uses America/New_York.
How many people live in 21207?
About 47,099 people live in ZIP code 21207, in 18,976 households, at 4,552.8 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 21207?
$67,060 a year, against $103,678 across Maryland.
What ZIP codes are near 21207?
The closest are 21215 (2.5 mi), 21216 (2.7 mi), 21229 (3.1 mi), 21244 (3.1 mi) and 21282 (3.5 mi).
Is 21207 a PO Box ZIP code?
21207 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21207 ZIP Code — Gwynn Oak, Maryland (Baltimore County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21207
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21207.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.