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/21916

21916

ZIP 21916 is Childs, Maryland, in Cecil County; area codes 443, 410 and 667; Eastern time.

Type
No street area
Time zone
America/New_York
County
Cecil
Coordinates
39.6462, -75.8716

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 21921, whose figures describe that area — not this ZIP code.

☼ Live from 21916 — Childs, MD

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Where 21916 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 21916
  • 🔢 Type 21916 into a pocket calculator and turn it upside down: gIGIZ — not quite a word, sorry.
  • ➕ As a number, 21,916 = 2 × 2 × 5479. Its digits add up to 19, a total 2,454 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101010110011100
  • 🏠 Its numerical neighbours: 21915 (Chesapeake City, MD, 10 mi away) and 21917 (Colora, MD, 12 mi away).
  • 🔄 Backwards, 21916 becomes 61912 — and that is a real ZIP code: Ashmore, IL, 648 miles away.
  • 👥 24 other ZIP codes are made of exactly the same digits (11692, 11962, 12169, 12196, 12916, 12961, …). The farthest-flung twin is 91612 in North Hollywood, CA, 2,356 miles away.
  • 🧭 Farther north than 53% of all ZIP codes, and farther east than 85%.
  • 🎯1,203 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21916 and you would come out at 39.65°S, 104.13°E — 844 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 21916 today
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Source: USGS.

Business and tax activity

Business establishments3This ZIP3
Employees37This ZIP37
Annual payroll$1,298,000This ZIP$1,298,000

Land area

ZIP codes near 21916

ZIPCityDistance
21921 Elkton, MD 1.5 mi
21920 Elk Mills, MD 1.8 mi
21922 Elkton, MD 3.4 mi
19351 Lewisville, PA 5.3 mi
21901 North East, MD 6.7 mi
19716 Newark, DE 6.8 mi
19717 Newark, DE 6.8 mi
19360 New London, PA 7.2 mi
19347 Kemblesville, PA 7.5 mi
21914 Charlestown, MD 7.8 mi

Find every ZIP code within 10 miles of 21916 →

Questions about this ZIP code

Where is ZIP code 21916?

21916 is in Childs, Maryland, in Cecil County, part of the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD metropolitan area. Its published point location is 39.6462, -75.8716.

What county is 21916 in?

21916 lies in Cecil County.

What area code is 21916?

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

What time zone is 21916 in?

21916 uses America/New_York.

What ZIP codes are near 21916?

The closest are 21921 (1.5 mi), 21920 (1.8 mi), 21922 (3.4 mi), 19351 (5.3 mi) and 21901 (6.7 mi).

Is 21916 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. “21916 ZIP Code — Childs, Maryland (Cecil County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21916

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/21916.json

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