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Where 21655 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 21655 into a pocket calculator and turn it upside down: SSgIZ — not quite a word, sorry.
- ➕ As a number, 21,655 = 5 × 61 × 71. Its digits add up to 19, a total 2,454 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101010010010111 - 🏠 Its numerical neighbours: 21654 (Oxford, MD, 12 mi away) and 21656 (Price, MD, 22 mi away).
- 🔄 Backwards, 21655 becomes 55612 — and that is a real ZIP code: Lutsen, MN, 969 miles away.
- 👥 30 other ZIP codes are made of exactly the same digits (12565, 15265, 15562, 15625, 16255, 21556, …). The farthest-flung twin is 56521 in Callaway, MN, 1,157 miles away.
- 🧭 Farther south than 53% of all ZIP codes, and farther east than 85%.
- 🎯1,211 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21655 and you would come out at 38.74°S, 104.09°E — 812 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 53m of daylight. Shortest: 9h 27m.
- 📏 At 52.7 square miles of land, 21655 is bigger than 61% of ZIP codes — room for about 40 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 5,053This ZIP5,053 |
|---|---|
| Households | 1,862This ZIP1,862 |
| Housing units | 1,989This ZIP1,989 |
| Median age | 42.2This ZIP42.2Maryland39.4US 38.9 |
| Median household income | $90,385This ZIP$90,385Maryland$103,678US $80,734 |
| Median home value | $289,200This ZIP$289,200Maryland$419,900US $332,700 |
| Median gross rent | $1,380This ZIP$1,380Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 24.0%This ZIP24.0% |
| Mean commute | 29.2 minThis ZIP29.2 min |
| Population density | 95.8 / sq miThis ZIP95.8 / sq mi |
Business and tax activity
| Business establishments | 91This ZIP91 |
|---|---|
| Employees | 614This ZIP614 |
| Annual payroll | $45,260,000This ZIP$45,260,000 |
| Tax returns filed | 2,370This ZIP2,370 |
| Total adjusted gross income | $163,872,000This ZIP$163,872,000 |
Land area
| Land area | 52.72 sq miThis ZIP52.72 sq mi |
|---|---|
| Water area | 3.34 sq miThis ZIP3.34 sq mi |
Counties 21655 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Caroline County | 100.0% |
| Dorchester County | 0.0% |
Other place names in 21655
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21655
| ZIP | City | Distance |
|---|---|---|
21609 | Bethlehem, MD | 2.5 mi |
21643 | Hurlock, MD | 7.2 mi |
21632 | Federalsburg, MD | 7.6 mi |
21625 | Cordova, MD | 9.0 mi |
21629 | Denton, MD | 9.2 mi |
21664 | Secretary, MD | 9.7 mi |
21601 | Easton, MD | 10.0 mi |
21673 | Trappe, MD | 10.0 mi |
21631 | East New Market, MD | 11.3 mi |
21641 | Hillsboro, MD | 12.0 mi |
Find every ZIP code within 10 miles of 21655 →
Questions about this ZIP code
Where is ZIP code 21655?
21655 is in Preston, Maryland, in Caroline County. Its published point location is 38.7450, -75.9128.
What county is 21655 in?
21655 spans 2 counties: Caroline County and Dorchester County. Most of it falls in Caroline 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 21655?
Preston uses area codes 667 and 410, from NANPA's telephone records.
What time zone is 21655 in?
21655 uses America/New_York.
How many people live in 21655?
About 5,053 people live in ZIP code 21655, in 1,862 households, at 95.8 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 21655?
$90,385 a year, against $103,678 across Maryland.
What ZIP codes are near 21655?
The closest are 21609 (2.5 mi), 21643 (7.2 mi), 21632 (7.6 mi), 21625 (9 mi) and 21629 (9.2 mi).
Is 21655 a PO Box ZIP code?
21655 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21655 ZIP Code — Preston, Maryland (Caroline County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21655
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21655.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.