21210
ZIP 21210 is in Baltimore, Maryland, mostly in Baltimore City; area codes 410, 443 and 667; Eastern time. Baltimore has 42 ZIP codes in all.
- Type
- Standard
- Time zone
- America/New_York
- County
- Baltimore city +1 more
- Metro area
- Baltimore-Columbia-Towson, MD
- Population
- 14,134
- Coordinates
- 39.3576, -76.6350
Weather right now
Asking the National Weather Service…
Where 21210 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 21210 into a pocket calculator and turn it upside down: OIZIZ — not quite a word, sorry.
- ➕ As a number, 21,210 = 2 × 3 × 5 × 7 × 101. Its digits add up to 6, a total 90 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101001011011010 - 🏠 Its numerical neighbours: 21209 (Baltimore, MD, 2 mi away) and 21211 (Baltimore, MD, 2 mi away).
- 🔄 Backwards, 21210 becomes 01212, which is not a ZIP code at all.
- 👥 19 other ZIP codes are made of exactly the same digits (02112, 02121, 02211, 10122, 10212, 11022, …). The farthest-flung twin is 02112 in Boston, MA, 357 miles away.
- 🧭 Farther north than 51% of all ZIP codes, and farther east than 83%.
- 🎯1,166 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21210 and you would come out at 39.36°S, 103.37°E — 867 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 57m of daylight. Shortest: 9h 23m.
- 📏 At 3.4 square miles of land, 21210 is bigger than 15% of ZIP codes — room for about 2.6 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 14,134This ZIP14,134 |
|---|---|
| Households | 5,202This ZIP5,202 |
| Housing units | 5,595This ZIP5,595 |
| Median age | 32.0This ZIP32.0Maryland39.4US 38.9 |
| Median household income | $112,428This ZIP$112,428Maryland$103,678US $80,734 |
| Median home value | $547,300This ZIP$547,300Maryland$419,900US $332,700 |
| Median gross rent | $1,535This ZIP$1,535Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 83.6%This ZIP83.6% |
| Mean commute | 23.4 minThis ZIP23.4 min |
| Population density | 4,100.4 / sq miThis ZIP4,100.4 / sq mi |
Business and tax activity
| Business establishments | 301This ZIP301 |
|---|---|
| Employees | 6,438This ZIP6,438 |
| Annual payroll | $297,927,000This ZIP$297,927,000 |
| Tax returns filed | 5,410This ZIP5,410 |
| Total adjusted gross income | $1,118,273,000This ZIP$1,118,273,000 |
Land area
| Land area | 3.45 sq miThis ZIP3.45 sq mi |
|---|---|
| Water area | 0.04 sq miThis ZIP0.04 sq mi |
Counties 21210 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Baltimore city | 84.4% |
| Baltimore County | 15.6% |
Other place names in 21210
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21210
| ZIP | City | Distance |
|---|---|---|
21212 | Baltimore, MD | 1.3 mi |
21209 | Baltimore, MD | 1.9 mi |
21211 | Baltimore, MD | 2.0 mi |
21285 | Towson, MD | 2.3 mi |
21239 | Baltimore, MD | 2.6 mi |
21218 | Baltimore, MD | 2.6 mi |
21215 | Baltimore, MD | 2.6 mi |
21252 | Towson, MD | 2.8 mi |
21251 | Baltimore, MD | 3.0 mi |
21204 | Towson, MD | 3.4 mi |
Find every ZIP code within 10 miles of 21210 →
Questions about this ZIP code
Where is ZIP code 21210?
21210 is in Baltimore, Maryland, in Baltimore city, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.3576, -76.6350.
What county is 21210 in?
21210 spans 2 counties: Baltimore city and Baltimore County. Most of it falls in Baltimore city, 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 21210?
Baltimore uses area codes 410, 443 and 667, from NANPA's telephone records.
What time zone is 21210 in?
21210 uses America/New_York.
How many people live in 21210?
About 14,134 people live in ZIP code 21210, in 5,202 households, at 4,100.4 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 21210?
$112,428 a year, against $103,678 across Maryland.
What ZIP codes are near 21210?
The closest are 21212 (1.3 mi), 21209 (1.9 mi), 21211 (2 mi), 21285 (2.3 mi) and 21239 (2.6 mi).
Is 21210 a PO Box ZIP code?
21210 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21210 ZIP Code — Baltimore, Maryland (Baltimore City).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21210
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21210.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.