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/21503

21503

ZIP 21503 is in Cumberland, Maryland, in Allegany County; area codes 240, 301 and 227; Eastern time. Cumberland has 5 ZIP codes; the others are 21501, 21502, 21504 and 21505.

Type
No street area
Time zone
America/New_York
County
Allegany
Metro area
Cumberland, MD-WV
Coordinates
39.6529, -78.7625

The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

This ZIP code has no Census tabulation area of its own. Its point falls inside ZCTA 21502, whose figures describe that area — not this ZIP code.

☼ Live from 21503 — Cumberland, MD

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Where 21503 is

This ZIP code has no Census tabulation area, so there is no boundary to draw — the marker is its published point location.

★ Weird and wonderful facts about 21503
  • 🔢 Type 21503 into a pocket calculator and turn it upside down: EOSIZ — not quite a word, sorry.
  • ➕ 21503 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 11, a total 714 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101001111111111
  • 🏠 Its numerical neighbours: 21502 (Cumberland, MD, 1 mi away) and 21504 (Cumberland, MD, 6 mi away).
  • 🔄 Backwards, 21503 becomes 30512 — and that is a real ZIP code: Blairsville, GA, 438 miles away.
  • 👥 73 other ZIP codes are made of exactly the same digits (01235, 01253, 01523, 01532, 02135, 02153, …). The farthest-flung twin is 51023 in Hawarden, IA, 945 miles away.
  • 🧭 Farther north than 53% of all ZIP codes, and farther east than 77%.
  • 🎯1,051 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21503 and you would come out at 39.65°S, 101.24°E — 975 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 59m of daylight. Shortest: 9h 22m.
🌙 The sky over 21503 today
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Source: USGS.

Land area

ZIP codes near 21503

ZIPCityDistance
21501 Cumberland, MD 0.0 mi
21502 Cumberland, MD 0.9 mi
26767 Wiley Ford, WV 2.6 mi
21529 Ellerslie, MD 4.3 mi
21524 Corriganville, MD 4.3 mi
21505 Cumberland, MD 5.9 mi
21545 Mount Savage, MD 6.0 mi
21504 Cumberland, MD 6.3 mi
26753 Ridgeley, WV 6.3 mi
21560 Spring Gap, MD 6.8 mi

Find every ZIP code within 10 miles of 21503 →

Questions about this ZIP code

Where is ZIP code 21503?

21503 is in Cumberland, Maryland, in Allegany County, part of the Cumberland, MD-WV micropolitan area. Its published point location is 39.6529, -78.7625.

What county is 21503 in?

21503 lies in Allegany County.

What area code is 21503?

Cumberland uses area codes 240, 301 and 227, from NANPA's telephone records.

What time zone is 21503 in?

21503 uses America/New_York.

What ZIP codes are near 21503?

The closest are 21501 (0 mi), 21502 (0.9 mi), 26767 (2.6 mi), 21529 (4.3 mi) and 21524 (4.3 mi).

Is 21503 a PO Box ZIP code?

Possibly. The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

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Cite this page

zipcodes.pro. “21503 ZIP Code — Cumberland, Maryland (Allegany County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21503

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/21503.json

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