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Where 21085 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 21085 into a pocket calculator and turn it upside down: SBOIZ — not quite a word, sorry.
- ➕ As a number, 21,085 = 5 × 4217. Its digits add up to 16, a total 1,922 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101001001011101 - 🏠 Its numerical neighbours: 21084 (Jarrettsville, MD, 13 mi away) and 21087 (Kingsville, MD, 3 mi away).
- 🔄 Backwards, 21085 becomes 58012 — and that is a real ZIP code: Casselton, ND, 1,164 miles away.
- 👥 65 other ZIP codes are made of exactly the same digits (01258, 01825, 01852, 02185, 02815, 05821, …). The farthest-flung twin is 85012 in Phoenix, AZ, 2,012 miles away.
- 🧭 Farther north than 52% of all ZIP codes, and farther east than 84%.
- 🎯1,180 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21085 and you would come out at 39.45°S, 103.64°E — 858 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 57m of daylight. Shortest: 9h 23m.
- 📏 At 19.0 square miles of land, 21085 is bigger than 37% of ZIP codes — room for about 14 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 17,307This ZIP17,307 |
|---|---|
| Households | 6,801This ZIP6,801 |
| Housing units | 7,169This ZIP7,169 |
| Median age | 42.3This ZIP42.3Maryland39.4US 38.9 |
| Median household income | $113,714This ZIP$113,714Maryland$103,678US $80,734 |
| Median home value | $348,600This ZIP$348,600Maryland$419,900US $332,700 |
| Median gross rent | $1,734This ZIP$1,734Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 31.2%This ZIP31.2% |
| Mean commute | 34.2 minThis ZIP34.2 min |
| Population density | 912.2 / sq miThis ZIP912.2 / sq mi |
Business and tax activity
| Business establishments | 294This ZIP294 |
|---|---|
| Employees | 3,148This ZIP3,148 |
| Annual payroll | $160,456,000This ZIP$160,456,000 |
| Tax returns filed | 9,010This ZIP9,010 |
| Total adjusted gross income | $705,708,000This ZIP$705,708,000 |
Land area
| Land area | 18.97 sq miThis ZIP18.97 sq mi |
|---|---|
| Water area | 0.89 sq miThis ZIP0.89 sq mi |
Counties 21085 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Harford County | 94.3% |
| Baltimore County | 5.7% |
Other place names in 21085
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21085
| ZIP | City | Distance |
|---|---|---|
21156 | Upper Falls, MD | 2.8 mi |
21087 | Kingsville, MD | 3.0 mi |
21040 | Edgewood, MD | 4.1 mi |
21009 | Abingdon, MD | 4.2 mi |
21018 | Benson, MD | 4.6 mi |
21162 | White Marsh, MD | 4.6 mi |
21010 | Gunpowder, MD | 5.1 mi |
21051 | Fork, MD | 5.6 mi |
21128 | Perry Hall, MD | 5.6 mi |
21027 | Chase, MD | 5.7 mi |
Find every ZIP code within 10 miles of 21085 →
Questions about this ZIP code
Where is ZIP code 21085?
21085 is in Joppa, Maryland, in Harford County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.4459, -76.3570.
What county is 21085 in?
21085 spans 2 counties: Harford County and Baltimore County. Most of it falls in Harford 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 21085?
Joppa uses area codes 443, 410 and 667, from NANPA's telephone records.
What time zone is 21085 in?
21085 uses America/New_York.
How many people live in 21085?
About 17,307 people live in ZIP code 21085, in 6,801 households, at 912.2 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 21085?
$113,714 a year, against $103,678 across Maryland.
What ZIP codes are near 21085?
The closest are 21156 (2.8 mi), 21087 (3 mi), 21040 (4.1 mi), 21009 (4.2 mi) and 21018 (4.6 mi).
Is 21085 a PO Box ZIP code?
21085 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21085 ZIP Code — Joppa, Maryland (Harford County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21085
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21085.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.