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/21903

21903

ZIP 21903 is Perryville, Maryland, in Cecil County; area codes 443, 667 and 410; Eastern time.

Type
Standard
Time zone
America/New_York
County
Cecil
Population
5,692
Coordinates
39.5741, -76.0452
☼ Live from 21903 — Perryville, MD

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 21903 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 21903
  • 🔢 Type 21903 into a pocket calculator and turn it upside down: EOGIZ — not quite a word, sorry.
  • ➕ As a number, 21,903 = 3 × 7 × 7 × 149. Its digits add up to 15, a total 1,657 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101010110001111
  • 🏠 Its numerical neighbours: 21902 (Perry Point, MD, 2 mi away) and 21904 (Port Deposit, MD, 3 mi away).
  • 🔄 Backwards, 21903 becomes 30912 — and that is a real ZIP code: Augusta, GA, 535 miles away.
  • 👥 65 other ZIP codes are made of exactly the same digits (01923, 02139, 03291, 09123, 09132, 09213, …). The farthest-flung twin is 09213 in APO AE, a military post office, 3,987 miles away.
  • 🧭 Farther north than 53% of all ZIP codes, and farther east than 85%.
  • 🎯1,195 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21903 and you would come out at 39.57°S, 103.95°E — 849 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 58m of daylight. Shortest: 9h 22m.
  • 📏 At 12.7 square miles of land, 21903 is bigger than 30% of ZIP codes — room for about 9.7 Central Parks.
🌙 The sky over 21903 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population5,692This ZIP5,692
Households2,383This ZIP2,383
Housing units2,421This ZIP2,421
Median age43.1This ZIP43.1Maryland39.4US 38.9
Median household income$78,962This ZIP$78,962Maryland$103,678US $80,734
Median home value$299,300This ZIP$299,300Maryland$419,900US $332,700
Median gross rent$916This ZIP$916Maryland$1,705US $1,413
Bachelor's degree or higher20.1%This ZIP20.1%
Mean commute27.3 minThis ZIP27.3 min
Population density447.4 / sq miThis ZIP447.4 / sq mi

Business and tax activity

Business establishments103This ZIP103
Employees2,377This ZIP2,377
Annual payroll$115,615,000This ZIP$115,615,000
Tax returns filed2,820This ZIP2,820
Total adjusted gross income$208,371,000This ZIP$208,371,000

Land area

Land area12.72 sq miThis ZIP12.72 sq mi
Water area1.11 sq miThis ZIP1.11 sq mi

Other place names in 21903

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

ZIP codes near 21903

ZIPCityDistance
21902 Perry Point, MD 1.8 mi
21904 Port Deposit, MD 3.1 mi
21914 Charlestown, MD 3.2 mi
21901 North East, MD 4.2 mi
21078 Havre De Grace, MD 5.2 mi
21917 Colora, MD 7.3 mi
21005 Aberdeen Proving Ground, MD 7.8 mi
21911 Rising Sun, MD 8.4 mi
21001 Aberdeen, MD 9.6 mi
21918 Conowingo, MD 10.0 mi

Find every ZIP code within 10 miles of 21903 →

Questions about this ZIP code

Where is ZIP code 21903?

21903 is in Perryville, Maryland, in Cecil County, part of the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD metropolitan area. Its published point location is 39.5741, -76.0452.

What county is 21903 in?

21903 lies in Cecil County.

What area code is 21903?

Perryville uses area codes 443, 667 and 410, from NANPA's telephone records.

What time zone is 21903 in?

21903 uses America/New_York.

How many people live in 21903?

About 5,692 people live in ZIP code 21903, in 2,383 households, at 447.4 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 21903?

$78,962 a year, against $103,678 across Maryland.

What ZIP codes are near 21903?

The closest are 21902 (1.8 mi), 21904 (3.1 mi), 21914 (3.2 mi), 21901 (4.2 mi) and 21078 (5.2 mi).

Is 21903 a PO Box ZIP code?

21903 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “21903 ZIP Code — Perryville, Maryland (Cecil County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21903

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/21903.json

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