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Where 21013 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 21013 into a pocket calculator and turn it upside down: EIOIZ — not quite a word, sorry.
- ➕ 21013 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 7, a total 150 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101001000010101 - 🏠 Its numerical neighbours: 21012 (Arnold, MD, 32 mi away) and 21014 (Bel Air, MD, 8 mi away).
- 🔄 Backwards, 21013 becomes 31012 — and that is a real ZIP code: Chester, GA, 617 miles away.
- 👥 31 other ZIP codes are made of exactly the same digits (02113, 02131, 10123, 10132, 10213, 10312, …). The farthest-flung twin is 32110 in Bunnell, FL, 748 miles away.
- 🧭 Farther north than 52% of all ZIP codes, and farther east than 83%.
- 🎯1,172 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21013 and you would come out at 39.51°S, 103.51°E — 866 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 58m of daylight. Shortest: 9h 22m.
- 📏 At 15.0 square miles of land, 21013 is bigger than 33% of ZIP codes — room for about 11 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 5,610This ZIP5,610 |
|---|---|
| Households | 1,843This ZIP1,843 |
| Housing units | 1,894This ZIP1,894 |
| Median age | 40.7This ZIP40.7Maryland39.4US 38.9 |
| Median household income | $171,354This ZIP$171,354Maryland$103,678US $80,734 |
| Median home value | $572,100This ZIP$572,100Maryland$419,900US $332,700 |
| Median gross rent | $1,183This ZIP$1,183Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 56.0%This ZIP56.0% |
| Mean commute | 35.1 minThis ZIP35.1 min |
| Population density | 374.0 / sq miThis ZIP374.0 / sq mi |
Business and tax activity
| Business establishments | 78This ZIP78 |
|---|---|
| Employees | 332This ZIP332 |
| Annual payroll | $19,452,000This ZIP$19,452,000 |
| Tax returns filed | 2,400This ZIP2,400 |
| Total adjusted gross income | $388,867,000This ZIP$388,867,000 |
Land area
| Land area | 15.00 sq miThis ZIP15.00 sq mi |
|---|---|
| Water area | 0.02 sq miThis ZIP0.02 sq mi |
Counties 21013 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 | 71.1% |
| Harford County | 28.9% |
Other place names in 21013
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21013
| ZIP | City | Distance |
|---|---|---|
21082 | Hydes, MD | 2.5 mi |
21047 | Fallston, MD | 3.0 mi |
21092 | Long Green, MD | 3.2 mi |
21051 | Fork, MD | 3.3 mi |
21057 | Glen Arm, MD | 4.5 mi |
21131 | Phoenix, MD | 5.3 mi |
21018 | Benson, MD | 5.6 mi |
21087 | Kingsville, MD | 6.0 mi |
21111 | Monkton, MD | 6.9 mi |
21084 | Jarrettsville, MD | 7.2 mi |
Find every ZIP code within 10 miles of 21013 →
Questions about this ZIP code
Where is ZIP code 21013?
21013 is in Baldwin, Maryland, in Baltimore County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.5115, -76.4908.
What county is 21013 in?
21013 spans 2 counties: Baltimore County and Harford County. 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 21013?
Baldwin uses area codes 443, 410 and 667, from NANPA's telephone records.
What time zone is 21013 in?
21013 uses America/New_York.
How many people live in 21013?
About 5,610 people live in ZIP code 21013, in 1,843 households, at 374.0 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 21013?
$171,354 a year, against $103,678 across Maryland.
What ZIP codes are near 21013?
The closest are 21082 (2.5 mi), 21047 (3 mi), 21092 (3.2 mi), 21051 (3.3 mi) and 21057 (4.5 mi).
Is 21013 a PO Box ZIP code?
21013 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21013 ZIP Code — Baldwin, Maryland (Baltimore County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21013
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21013.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.