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Where 21830 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 21830 into a pocket calculator and turn it upside down: OEBIZ — not quite a word, sorry.
- ➕ As a number, 21,830 = 2 × 5 × 37 × 59. Its digits add up to 14, a total 1,416 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101010101000110 - 🏠 Its numerical neighbours: 21829 (Girdletree, MD, 29 mi away) and 21835 (Linkwood, MD, 14 mi away).
- 🔄 Backwards, 21830 becomes 03812 — and that is a real ZIP code: Bartlett, NH, 455 miles away.
- 👥 70 other ZIP codes are made of exactly the same digits (01238, 01832, 02138, 02381, 02813, 02831, …). The farthest-flung twin is 83210 in Aberdeen, ID, 1,955 miles away.
- 🧭 Farther south than 56% of all ZIP codes, and farther east than 85%.
- 🎯1,225 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21830 and you would come out at 38.40°S, 104.27°E — 791 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 51m of daylight. Shortest: 9h 29m.
- 📏 At 32.9 square miles of land, 21830 is bigger than 48% of ZIP codes — room for about 25 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 5,200This ZIP5,200 |
|---|---|
| Households | 1,805This ZIP1,805 |
| Housing units | 1,880This ZIP1,880 |
| Median age | 36.0This ZIP36.0Maryland39.4US 38.9 |
| Median household income | $112,991This ZIP$112,991Maryland$103,678US $80,734 |
| Median home value | $282,300This ZIP$282,300Maryland$419,900US $332,700 |
| Median gross rent | $1,599This ZIP$1,599Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 42.6%This ZIP42.6% |
| Mean commute | 27.2 minThis ZIP27.2 min |
| Population density | 158.1 / sq miThis ZIP158.1 / sq mi |
Business and tax activity
| Business establishments | 71This ZIP71 |
|---|---|
| Employees | 443This ZIP443 |
| Annual payroll | $23,353,000This ZIP$23,353,000 |
| Tax returns filed | 2,030This ZIP2,030 |
| Total adjusted gross income | $153,196,000This ZIP$153,196,000 |
Land area
| Land area | 32.89 sq miThis ZIP32.89 sq mi |
|---|---|
| Water area | 0.86 sq miThis ZIP0.86 sq mi |
Other place names in 21830
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21830
| ZIP | City | Distance |
|---|---|---|
21837 | Mardela Springs, MD | 4.3 mi |
21801 | Salisbury, MD | 4.5 mi |
21856 | Quantico, MD | 5.6 mi |
21802 | Salisbury, MD | 5.8 mi |
21803 | Salisbury, MD | 5.8 mi |
21810 | Allen, MD | 7.8 mi |
21826 | Fruitland, MD | 7.9 mi |
21822 | Eden, MD | 8.5 mi |
21865 | Tyaskin, MD | 9.4 mi |
21861 | Sharptown, MD | 9.6 mi |
Find every ZIP code within 10 miles of 21830 →
Questions about this ZIP code
Where is ZIP code 21830?
21830 is in Hebron, Maryland, in Wicomico County, part of the Salisbury, MD metropolitan area. Its published point location is 38.3974, -75.7348.
What county is 21830 in?
21830 lies in Wicomico County.
What area code is 21830?
Hebron uses area codes 410, 667 and 443, from NANPA's telephone records.
What time zone is 21830 in?
21830 uses America/New_York.
How many people live in 21830?
About 5,200 people live in ZIP code 21830, in 1,805 households, at 158.1 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 21830?
$112,991 a year, against $103,678 across Maryland.
What ZIP codes are near 21830?
The closest are 21837 (4.3 mi), 21801 (4.5 mi), 21856 (5.6 mi), 21802 (5.8 mi) and 21803 (5.8 mi).
Is 21830 a PO Box ZIP code?
21830 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21830 ZIP Code — Hebron, Maryland (Wicomico County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21830
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21830.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.