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/18105

18105

ZIP 18105 is in Allentown, Pennsylvania, in Lehigh County; area codes 484, 610 and 835; Eastern time. Allentown has 8 ZIP codes in all.

Type
No street area
Time zone
America/New_York
County
Lehigh
Coordinates
40.6084, -75.4902

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 18102, whose figures describe that area — not this ZIP code.

☼ Live from 18105 — Allentown, PA

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Where 18105 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 18105
  • 🔢 Type 18105 into a pocket calculator and turn it upside down: SOIBI — not quite a word, sorry.
  • ➕ As a number, 18,105 = 3 × 5 × 17 × 71. Its digits add up to 15, a total 1,657 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 100011010111001
  • 🏠 Its numerical neighbours: 18104 (Allentown, PA, 3 mi away) and 18106 (Allentown, PA, 5 mi away).
  • 🔄 Backwards, 18105 becomes 50181, which is not a ZIP code at all.
  • 👥 25 other ZIP codes are made of exactly the same digits (01518, 01581, 01815, 01851, 08511, 10158, …). The farthest-flung twin is 85011 in Phoenix, AZ, 2,062 miles away.
  • 🧭 Farther north than 62% of all ZIP codes, and farther east than 86%.
  • 🎯1,216 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 18105 and you would come out at 40.61°S, 104.51°E — 869 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 05m of daylight. Shortest: 9h 16m.
🌙 The sky over 18105 today
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Source: USGS.

Business and tax activity

Business establishments28This ZIP28
Employees690This ZIP690
Annual payroll$66,478,000This ZIP$66,478,000

Land area

ZIP codes near 18105

ZIPCityDistance
18102 Allentown, PA 0.7 mi
18101 Allentown, PA 1.1 mi
18103 Allentown, PA 2.6 mi
18104 Allentown, PA 3.0 mi
18109 Allentown, PA 3.1 mi
18052 Whitehall, PA 3.5 mi
18032 Catasauqua, PA 3.5 mi
18098 Emmaus, PA 4.8 mi
18099 Emmaus, PA 4.8 mi
18106 Allentown, PA 5.0 mi

Find every ZIP code within 10 miles of 18105 →

Questions about this ZIP code

Where is ZIP code 18105?

18105 is in Allentown, Pennsylvania, in Lehigh County, part of the Allentown-Bethlehem-Easton, PA-NJ metropolitan area. Its published point location is 40.6084, -75.4902.

What county is 18105 in?

18105 lies in Lehigh County.

What area code is 18105?

Allentown uses area codes 484, 610 and 835, from NANPA's telephone records.

What time zone is 18105 in?

18105 uses America/New_York.

What ZIP codes are near 18105?

The closest are 18102 (0.7 mi), 18101 (1.1 mi), 18103 (2.6 mi), 18104 (3 mi) and 18109 (3.1 mi).

Is 18105 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. “18105 ZIP Code — Allentown, Pennsylvania (Lehigh County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/18105

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