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Where 21817 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 21817 into a pocket calculator and turn it upside down: LIBIZ — not quite a word, sorry.
- ➕ 21817 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 19, a total 2,454 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101010100111001 - 🏠 Its numerical neighbours: 21814 (Bivalve, MD, 22 mi away) and 21821 (Deal Island, MD, 13 mi away).
- 🔄 Backwards, 21817 becomes 71812, which is not a ZIP code at all.
- 👥 25 other ZIP codes are made of exactly the same digits (11782, 12187, 12781, 12817, 12871, 17128, …). The farthest-flung twin is 87121 in Albuquerque, NM, 1,729 miles away.
- 🧭 Farther south than 58% of all ZIP codes, and farther east than 85%.
- 🎯1,226 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21817 and you would come out at 37.98°S, 104.16°E — 781 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 48m of daylight. Shortest: 9h 31m.
- 📏 At 14.5 square miles of land, 21817 is bigger than 32% of ZIP codes — room for about 11 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 4,417This ZIP4,417 |
|---|---|
| Households | 1,925This ZIP1,925 |
| Housing units | 2,554This ZIP2,554 |
| Median age | 42.1This ZIP42.1Maryland39.4US 38.9 |
| Median household income | $55,720This ZIP$55,720Maryland$103,678US $80,734 |
| Median home value | $161,000This ZIP$161,000Maryland$419,900US $332,700 |
| Median gross rent | $766This ZIP$766Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 25.6%This ZIP25.6% |
| Mean commute | 26.4 minThis ZIP26.4 min |
| Population density | 305.4 / sq miThis ZIP305.4 / sq mi |
Business and tax activity
| Business establishments | 102This ZIP102 |
|---|---|
| Employees | 1,179This ZIP1,179 |
| Annual payroll | $49,500,000This ZIP$49,500,000 |
| Tax returns filed | 2,160This ZIP2,160 |
| Total adjusted gross income | $107,493,000This ZIP$107,493,000 |
Land area
| Land area | 14.46 sq miThis ZIP14.46 sq mi |
|---|---|
| Water area | 3.54 sq miThis ZIP3.54 sq mi |
Other place names in 21817
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21817
| ZIP | City | Distance |
|---|---|---|
21838 | Marion Station, MD | 5.9 mi |
23427 | Saxis, VA | 8.5 mi |
23426 | Sanford, VA | 8.8 mi |
21867 | Upper Fairmount, MD | 9.2 mi |
21871 | Westover, MD | 10.1 mi |
21866 | Tylerton, MD | 10.1 mi |
21857 | Rehobeth, MD | 10.2 mi |
21836 | Manokin, MD | 10.3 mi |
21824 | Ewell, MD | 11.0 mi |
23409 | Mears, VA | 11.4 mi |
Find every ZIP code within 10 miles of 21817 →
Questions about this ZIP code
Where is ZIP code 21817?
21817 is in Crisfield, Maryland, in Somerset County, part of the Salisbury, MD metropolitan area. Its published point location is 37.9810, -75.8361.
What county is 21817 in?
21817 lies in Somerset County.
What area code is 21817?
Crisfield uses area codes 410, 443 and 667, from NANPA's telephone records.
What time zone is 21817 in?
21817 uses America/New_York.
How many people live in 21817?
About 4,417 people live in ZIP code 21817, in 1,925 households, at 305.4 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 21817?
$55,720 a year, against $103,678 across Maryland.
What ZIP codes are near 21817?
The closest are 21838 (5.9 mi), 23427 (8.5 mi), 23426 (8.8 mi), 21867 (9.2 mi) and 21871 (10.1 mi).
Is 21817 a PO Box ZIP code?
21817 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21817 ZIP Code — Crisfield, Maryland (Somerset County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21817
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21817.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.