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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/17521

17521

ZIP 17521 is Elm, Pennsylvania, in Lancaster County; area codes 717 and 223; Eastern time.

Type
No street area
Time zone
America/New_York
County
Lancaster
Metro area
Lancaster, PA
Coordinates
40.2044, -76.3464

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 17543, whose figures describe that area — not this ZIP code.

☼ Live from 17521 — Elm, PA

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Local time: —

Where 17521 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 17521
  • 🔢 Type 17521 into a pocket calculator and turn it upside down: IZSLI — not quite a word, sorry.
  • ➕ As a number, 17,521 = 7 × 2503. Its digits add up to 16, a total 1,922 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 100010001110001
  • 🏠 Its numerical neighbours: 17520 (East Petersburg, PA, 7 mi away) and 17522 (Ephrata, PA, 10 mi away).
  • 🔄 Backwards, 17521 becomes 12571 — and that is a real ZIP code: Red Hook, NY, 181 miles away.
  • 👥 27 other ZIP codes are made of exactly the same digits (11572, 11725, 11752, 12157, 12175, 12517, …). The farthest-flung twin is 75211 in Dallas, TX, 1,250 miles away.
  • 🧭 Farther north than 58% of all ZIP codes, and farther east than 84%.
  • 🎯1,174 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 17521 and you would come out at 40.20°S, 103.65°E — 887 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 02m of daylight. Shortest: 9h 18m.
🌙 The sky over 17521 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments3This ZIP3
Employees26This ZIP26
Annual payroll$1,134,000This ZIP$1,134,000

Land area

ZIP codes near 17521

ZIPCityDistance
17543 Lititz, PA 3.1 mi
17545 Manheim, PA 4.6 mi
17533 Hopeland, PA 5.0 mi
17085 Rexmont, PA 5.4 mi
17016 Cornwall, PA 5.7 mi
17606 Lancaster, PA 6.7 mi
17083 Quentin, PA 7.2 mi
17088 Schaefferstown, PA 7.2 mi
17064 Mount Gretna, PA 7.3 mi
17520 East Petersburg, PA 7.4 mi

Find every ZIP code within 10 miles of 17521 →

Questions about this ZIP code

Where is ZIP code 17521?

17521 is in Elm, Pennsylvania, in Lancaster County, part of the Lancaster, PA metropolitan area. Its published point location is 40.2044, -76.3464.

What county is 17521 in?

17521 lies in Lancaster County.

What area code is 17521?

Elm uses area codes 717 and 223, from NANPA's telephone records.

What time zone is 17521 in?

17521 uses America/New_York.

What ZIP codes are near 17521?

The closest are 17543 (3.1 mi), 17545 (4.6 mi), 17533 (5 mi), 17085 (5.4 mi) and 17016 (5.7 mi).

Is 17521 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. “17521 ZIP Code — Elm, Pennsylvania (Lancaster County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/17521

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curl https://zipcodes.pro/zip/17521.json

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