Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — ZIP/21631

21631

ZIP 21631 is East New Market, Maryland, in Dorchester County; area codes 667 and 410; Eastern time.

Type
Standard
Time zone
America/New_York
County
Dorchester
Metro area
Cambridge, MD
Population
2,429
Coordinates
38.5824, -75.9390
☼ Live from 21631 — East New Market, MD

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 21631 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.

★ Weird and wonderful facts about 21631
  • 🔢 Type 21631 into a pocket calculator and turn it upside down: IEgIZ — not quite a word, sorry.
  • ➕ As a number, 21,631 = 97 × 223. Its digits add up to 13, a total 1,179 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101010001111111
  • 🏠 Its numerical neighbours: 21629 (Denton, MD, 20 mi away) and 21632 (Federalsburg, MD, 14 mi away).
  • 🔄 Backwards, 21631 becomes 13612 — and that is a real ZIP code: Black River, NY, 373 miles away.
  • 👥 31 other ZIP codes are made of exactly the same digits (11236, 11362, 12136, 13126, 13162, 13261, …). The farthest-flung twin is 62311 in Augusta, IL, 808 miles away.
  • 🧭 Farther south than 54% of all ZIP codes, and farther east than 85%.
  • 🎯1,212 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21631 and you would come out at 38.58°S, 104.06°E — 807 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 52m of daylight. Shortest: 9h 28m.
  • 📏 At 24.1 square miles of land, 21631 is bigger than 41% of ZIP codes — room for about 18 Central Parks.
🌙 The sky over 21631 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population2,429This ZIP2,429
Households942This ZIP942
Housing units1,020This ZIP1,020
Median age48.3This ZIP48.3Maryland39.4US 38.9
Median household income$73,864This ZIP$73,864Maryland$103,678US $80,734
Median home value$306,700This ZIP$306,700Maryland$419,900US $332,700
Median gross rent$1,541This ZIP$1,541Maryland$1,705US $1,413
Bachelor's degree or higher23.8%This ZIP23.8%
Mean commute18.4 minThis ZIP18.4 min
Population density100.6 / sq miThis ZIP100.6 / sq mi

Business and tax activity

Business establishments37This ZIP37
Employees290This ZIP290
Annual payroll$12,843,000This ZIP$12,843,000
Tax returns filed1,350This ZIP1,350
Total adjusted gross income$106,349,000This ZIP$106,349,000

Land area

Land area24.15 sq miThis ZIP24.15 sq mi
Water area3.83 sq miThis ZIP3.83 sq mi

Other place names in 21631

Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.

ZIP codes near 21631

ZIPCityDistance
21664 Secretary, MD 1.8 mi
21835 Linkwood, MD 3.3 mi
21643 Hurlock, MD 5.7 mi
21673 Trappe, MD 7.0 mi
21659 Rhodesdale, MD 7.5 mi
21613 Cambridge, MD 9.3 mi
21609 Bethlehem, MD 11.0 mi
21655 Preston, MD 11.3 mi
21861 Sharptown, MD 11.9 mi
21654 Oxford, MD 12.8 mi

Find every ZIP code within 10 miles of 21631 →

Questions about this ZIP code

Where is ZIP code 21631?

21631 is in East New Market, Maryland, in Dorchester County, part of the Cambridge, MD micropolitan area. Its published point location is 38.5824, -75.9390.

What county is 21631 in?

21631 lies in Dorchester County.

What area code is 21631?

East New Market uses area codes 667 and 410, from NANPA's telephone records.

What time zone is 21631 in?

21631 uses America/New_York.

How many people live in 21631?

About 2,429 people live in ZIP code 21631, in 942 households, at 100.6 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 21631?

$73,864 a year, against $103,678 across Maryland.

What ZIP codes are near 21631?

The closest are 21664 (1.8 mi), 21835 (3.3 mi), 21643 (5.7 mi), 21673 (7 mi) and 21659 (7.5 mi).

Is 21631 a PO Box ZIP code?

21631 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “21631 ZIP Code — East New Market, Maryland (Dorchester County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21631

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/21631.json

Underlying data is public domain or openly licensed — sources, vintages and licences.