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/21106

21106

ZIP 21106 is Mayo, Maryland, in Anne Arundel County; area codes 443, 410 and 667; Eastern time.

Type
No street area
Time zone
America/New_York
County
Anne Arundel
Coordinates
38.8876, -76.5119

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 21037, whose figures describe that area — not this ZIP code.

☼ Live from 21106 — Mayo, MD

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Where 21106 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 21106
  • 🔢 Type 21106 into a pocket calculator and turn it upside down: gOIIZ — not quite a word, sorry.
  • ➕ As a number, 21,106 = 2 × 61 × 173. Its digits add up to 10, a total 513 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101001001110010
  • 🏠 Its numerical neighbours: 21105 (Maryland Line, MD, 58 mi away) and 21108 (Millersville, MD, 15 mi away).
  • 🔄 Backwards, 21106 becomes 60112 — and that is a real ZIP code: Cortland, IL, 673 miles away.
  • 👥 32 other ZIP codes are made of exactly the same digits (01612, 02116, 06112, 10126, 10162, 10261, …). The farthest-flung twin is 61201 in Rock Island, IL, 763 miles away.
  • 🧭 Farther south than 52% of all ZIP codes, and farther east than 83%.
  • 🎯1,178 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21106 and you would come out at 38.89°S, 103.49°E — 844 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 54m of daylight. Shortest: 9h 26m.
🌙 The sky over 21106 today
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Source: USGS.

Business and tax activity

Business establishments5This ZIP5
Employees52This ZIP52
Annual payroll$3,109,000This ZIP$3,109,000

Land area

ZIP codes near 21106

ZIPCityDistance
21037 Edgewater, MD 2.8 mi
20765 Galesville, MD 3.4 mi
20764 Shady Side, MD 3.9 mi
21403 Annapolis, MD 4.0 mi
20776 Harwood, MD 4.4 mi
20778 West River, MD 5.2 mi
20733 Churchton, MD 5.8 mi
21140 Riva, MD 5.9 mi
21404 Annapolis, MD 6.4 mi
20751 Deale, MD 7.0 mi

Find every ZIP code within 10 miles of 21106 →

Questions about this ZIP code

Where is ZIP code 21106?

21106 is in Mayo, Maryland, in Anne Arundel County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 38.8876, -76.5119.

What county is 21106 in?

21106 lies in Anne Arundel County.

What area code is 21106?

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

What time zone is 21106 in?

21106 uses America/New_York.

What ZIP codes are near 21106?

The closest are 21037 (2.8 mi), 20765 (3.4 mi), 20764 (3.9 mi), 21403 (4 mi) and 20776 (4.4 mi).

Is 21106 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. “21106 ZIP Code — Mayo, Maryland (Anne Arundel County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21106

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/21106.json

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