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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/17604

17604

ZIP 17604 is in Lancaster, Pennsylvania, in Lancaster County; area codes 717 and 223; Eastern time. Lancaster has 11 ZIP codes in all.

Type
No street area
Time zone
America/New_York
County
Lancaster
Metro area
Lancaster, PA
Coordinates
40.0651, -76.3356

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 17601, whose figures describe that area — not this ZIP code.

☼ Live from 17604 — Lancaster, PA

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Where 17604 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 17604
  • 🔢 Type 17604 into a pocket calculator and turn it upside down: hOgLI — not quite a word, sorry.
  • ➕ As a number, 17,604 = 2 × 2 × 3 × 3 × 3 × 163. Its digits add up to 18, a total 2,332 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 100010011000100
  • 🏠 Its numerical neighbours: 17603 (Lancaster, PA, 2 mi away) and 17605 (Lancaster, PA, 4 mi away).
  • 🔄 Backwards, 17604 becomes 40671, which is not a ZIP code at all.
  • 👥 72 other ZIP codes are made of exactly the same digits (01467, 01746, 04617, 04671, 04761, 06147, …). The farthest-flung twin is 76401 in Stephenville, TX, 1,329 miles away.
  • 🧭 Farther north than 57% of all ZIP codes, and farther east than 84%.
  • 🎯1,175 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 17604 and you would come out at 40.07°S, 103.66°E — 881 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 01m of daylight. Shortest: 9h 19m.
🌙 The sky over 17604 today
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Source: USGS.

Business and tax activity

Business establishments49This ZIP49
Employees11,243This ZIP11,243
Annual payroll$871,100,000This ZIP$871,100,000

Land area

ZIP codes near 17604

ZIPCityDistance
17601 Lancaster, PA 1.3 mi
17520 East Petersburg, PA 2.4 mi
17603 Lancaster, PA 2.4 mi
17622 Lancaster, PA 2.4 mi
17611 Lancaster, PA 2.5 mi
17504 Bausman, PA 2.8 mi
17606 Lancaster, PA 3.7 mi
17503 Bart, PA 3.8 mi
17564 Penryn, PA 3.8 mi
17605 Lancaster, PA 3.8 mi

Find every ZIP code within 10 miles of 17604 →

Questions about this ZIP code

Where is ZIP code 17604?

17604 is in Lancaster, Pennsylvania, in Lancaster County, part of the Lancaster, PA metropolitan area. Its published point location is 40.0651, -76.3356.

What county is 17604 in?

17604 lies in Lancaster County.

What area code is 17604?

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

What time zone is 17604 in?

17604 uses America/New_York.

What ZIP codes are near 17604?

The closest are 17601 (1.3 mi), 17520 (2.4 mi), 17603 (2.4 mi), 17622 (2.4 mi) and 17611 (2.5 mi).

Is 17604 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. “17604 ZIP Code — Lancaster, Pennsylvania (Lancaster County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/17604

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