21251
ZIP 21251 is in Baltimore, Maryland, 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
- Metro area
- Baltimore-Columbia-Towson, MD
- Population
- 191
- Coordinates
- 39.3499, -76.5802
Weather right now
Asking the National Weather Service…
Where 21251 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 21251 into a pocket calculator and turn it upside down: ISZIZ — not quite a word, sorry.
- ➕ As a number, 21,251 = 79 × 269. Its digits add up to 11, a total 714 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101001100000011 - 🏠 Its numerical neighbours: 21250 (Baltimore, MD, 10 mi away) and 21252 (Towson, MD, 3 mi away).
- 🔄 Backwards, 21251 becomes 15212 — and that is a real ZIP code: Pittsburgh, PA, 196 miles away.
- 👥 17 other ZIP codes are made of exactly the same digits (11225, 11252, 12125, 12512, 12521, 15122, …). The farthest-flung twin is 52211 in Brooklyn, IA, 848 miles away.
- 🧭 Farther north than 51% of all ZIP codes, and farther east than 83%.
- 🎯1,169 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21251 and you would come out at 39.35°S, 103.42°E — 864 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 57m of daylight. Shortest: 9h 23m.
- 📏 At 0.118 square miles of land, 21251 is bigger than 1% of ZIP codes — about 57 football fields.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 191This ZIP191 |
|---|---|
| Households | 0 |
| Housing units | 0 |
| Median age | 19.5This ZIP19.5Maryland39.4US 38.9 |
| Bachelor's degree or higher | 50.0%This ZIP50.0% |
| Mean commute | 19.6 minThis ZIP19.6 min |
| Population density | 1,618.6 / sq miThis ZIP1,618.6 / sq mi |
Business and tax activity
| Business establishments | 14This ZIP14 |
|---|---|
| Employees | 202This ZIP202 |
| Annual payroll | $7,036,000This ZIP$7,036,000 |
Land area
| Land area | 0.12 sq miThis ZIP0.12 sq mi |
|---|---|
| Water area | 0.00 sq mi |
Other place names in 21251
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21251
| ZIP | City | Distance |
|---|---|---|
21214 | Baltimore, MD | 0.9 mi |
21239 | Baltimore, MD | 1.1 mi |
21218 | Baltimore, MD | 1.8 mi |
21212 | Baltimore, MD | 2.2 mi |
21206 | Baltimore, MD | 2.3 mi |
21213 | Baltimore, MD | 2.4 mi |
21210 | Baltimore, MD | 3.0 mi |
21285 | Towson, MD | 3.3 mi |
21205 | Baltimore, MD | 3.4 mi |
21252 | Towson, MD | 3.5 mi |
Find every ZIP code within 10 miles of 21251 →
Questions about this ZIP code
Where is ZIP code 21251?
21251 is in Baltimore, Maryland, in Baltimore city, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.3499, -76.5802.
What county is 21251 in?
21251 lies in Baltimore city.
What area code is 21251?
Baltimore uses area codes 410, 443 and 667, from NANPA's telephone records.
What time zone is 21251 in?
21251 uses America/New_York.
How many people live in 21251?
About 191 people live in ZIP code 21251, at 1,618.6 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.
What ZIP codes are near 21251?
The closest are 21214 (0.9 mi), 21239 (1.1 mi), 21218 (1.8 mi), 21212 (2.2 mi) and 21206 (2.3 mi).
Is 21251 a PO Box ZIP code?
21251 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21251 ZIP Code — Baltimore, Maryland (Baltimore City).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21251
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21251.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.