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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/21556

21556

ZIP 21556 is Pinto, Maryland, in Allegany County; area codes 240, 301 and 227; Eastern time.

Type
No street area
Time zone
America/New_York
County
Allegany
Metro area
Cumberland, MD-WV
Coordinates
39.5725, -78.8440

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 21556 — Pinto, MD

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Local time: —

Where 21556 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 21556
  • 🔢 Type 21556 into a pocket calculator and turn it upside down: gSSIZ — not quite a word, sorry.
  • ➕ As a number, 21,556 = 2 × 2 × 17 × 317. Its digits add up to 19, a total 2,454 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101010000110100
  • 🏠 Its numerical neighbours: 21555 (Oldtown, MD, 15 mi away) and 21557 (Rawlings, MD, 6 mi away).
  • 🔄 Backwards, 21556 becomes 65512, which is not a ZIP code at all.
  • 👥 30 other ZIP codes are made of exactly the same digits (12565, 15265, 15562, 15625, 16255, 21655, …). The farthest-flung twin is 56521 in Callaway, MN, 997 miles away.
  • 🧭 Farther north than 53% of all ZIP codes, and farther east than 77%.
  • 🎯1,047 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21556 and you would come out at 39.57°S, 101.16°E — 976 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 58m of daylight. Shortest: 9h 22m.
🌙 The sky over 21556 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

Land area

ZIP codes near 21556

ZIPCityDistance
21505 Cumberland, MD 1.5 mi
26753 Ridgeley, WV 4.1 mi
26767 Wiley Ford, WV 5.5 mi
21557 Rawlings, MD 5.6 mi
21542 Midland, MD 5.8 mi
21528 Eckhart Mines, MD 6.3 mi
26719 Fort Ashby, WV 6.6 mi
21502 Cumberland, MD 6.7 mi
21501 Cumberland, MD 7.0 mi
21503 Cumberland, MD 7.0 mi

Find every ZIP code within 10 miles of 21556 →

Questions about this ZIP code

Where is ZIP code 21556?

21556 is in Pinto, Maryland, in Allegany County, part of the Cumberland, MD-WV micropolitan area. Its published point location is 39.5725, -78.8440.

What county is 21556 in?

21556 lies in Allegany County.

What area code is 21556?

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

What time zone is 21556 in?

21556 uses America/New_York.

What ZIP codes are near 21556?

The closest are 21505 (1.5 mi), 26753 (4.1 mi), 26767 (5.5 mi), 21557 (5.6 mi) and 21542 (5.8 mi).

Is 21556 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. “21556 ZIP Code — Pinto, Maryland (Allegany County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21556

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/21556.json

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