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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/16221

16221

ZIP 16221 is Curllsville, Pennsylvania, in Clarion County; area code 814; Eastern time.

Type
No street area
Time zone
America/New_York
County
Clarion
Metro area
none
Coordinates
41.2023, -79.4538

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 16254, whose figures describe that area — not this ZIP code.

☼ Live from 16221 — Curllsville, PA

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Where 16221 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 16221
  • 🔢 Type 16221 into a pocket calculator and turn it upside down: IZZgI — not quite a word, sorry.
  • ➕ As a number, 16,221 = 3 × 5407. Its digits add up to 12, a total 940 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 11111101011101
  • 🏠 Its numerical neighbours: 16220 (Crown, PA, 18 mi away) and 16222 (Dayton, PA, 25 mi away).
  • 🔄 Backwards, 16221 becomes 12261 — and that is a real ZIP code: Albany, NY, 309 miles away.
  • 👥 10 other ZIP codes are made of exactly the same digits (11226, 12261, 16212, 21162, 21216, 21612, …). The farthest-flung twin is 12261 in Albany, NY, 309 miles away.
  • 🧭 Farther north than 68% of all ZIP codes, and farther east than 75%.
  • 🎯1,007 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 16221 and you would come out at 41.20°S, 100.55°E — 1,061 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 09m of daylight. Shortest: 9h 12m.
🌙 The sky over 16221 today
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Source: USGS.

Land area

ZIP codes near 16221

ZIPCityDistance
16234 Limestone, PA 0.0 mi
16254 Shippenville, PA 3.6 mi
16255 Sligo, PA 5.1 mi
16232 Knox, PA 5.1 mi
16214 Clarion, PA 5.2 mi
16334 Marble, PA 7.1 mi
16213 Callensburg, PA 7.6 mi
16331 Kossuth, PA 8.0 mi
16058 Turkey City, PA 8.4 mi
16235 Lucinda, PA 9.0 mi

Find every ZIP code within 10 miles of 16221 →

Questions about this ZIP code

Where is ZIP code 16221?

16221 is in Curllsville, Pennsylvania, in Clarion County. Its published point location is 41.2023, -79.4538.

What county is 16221 in?

16221 lies in Clarion County.

What area code is 16221?

Curllsville uses area code 814, from NANPA's telephone records.

What time zone is 16221 in?

16221 uses America/New_York.

What ZIP codes are near 16221?

The closest are 16234 (0 mi), 16254 (3.6 mi), 16255 (5.1 mi), 16232 (5.1 mi) and 16214 (5.2 mi).

Is 16221 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. “16221 ZIP Code — Curllsville, Pennsylvania (Clarion County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/16221

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/16221.json

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