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/18001

18001

ZIP 18001 is in Lehigh Valley, Pennsylvania, in Northampton County; area codes 610, 484 and 835; Eastern time. Lehigh Valley has 3 ZIP codes; the others are 18002 and 18003.

Type
No street area
Time zone
America/New_York
County
Northampton
Coordinates
40.6934, -75.4712

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 18067, whose figures describe that area — not this ZIP code.

☼ Live from 18001 — Lehigh Valley, PA

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Where 18001 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 18001
  • 🔢 Type 18001 into a pocket calculator and turn it upside down: IOOBI — not quite a word, sorry.
  • ➕ As a number, 18,001 = 47 × 383. Its digits add up to 10, a total 513 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 100011001010001
  • 🏠 Its numerical neighbours: 17985 (Zion Grove, PA, 43 mi away) and 18002 (Lehigh Valley, PA, 3 mi away).
  • 🔄 Backwards, 18001 becomes 10081 — and that is a real ZIP code: New York, NY, 77 miles away.
  • 👥 16 other ZIP codes are made of exactly the same digits (01081, 01108, 01801, 01810, 08011, 08101, …). The farthest-flung twin is 81010 in Pueblo, CO, 1,555 miles away.
  • 🧭 Farther north than 63% 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 18001 and you would come out at 40.69°S, 104.53°E — 872 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 05m of daylight. Shortest: 9h 15m.
🌙 The sky over 18001 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments6This ZIP6
Employees231This ZIP231
Annual payroll$13,299,000This ZIP$13,299,000

Land area

ZIP codes near 18001

ZIPCityDistance
18003 Lehigh Valley, PA 0.0 mi
18016 Bethlehem, PA 0.0 mi
18067 Northampton, PA 1.7 mi
18032 Catasauqua, PA 2.6 mi
18052 Whitehall, PA 3.0 mi
18002 Lehigh Valley, PA 3.0 mi
18037 Coplay, PA 4.1 mi
18109 Allentown, PA 4.3 mi
18059 Laurys Station, PA 4.3 mi
18017 Bethlehem, PA 5.0 mi

Find every ZIP code within 10 miles of 18001 →

Questions about this ZIP code

Where is ZIP code 18001?

18001 is in Lehigh Valley, Pennsylvania, in Northampton County, part of the Allentown-Bethlehem-Easton, PA-NJ metropolitan area. Its published point location is 40.6934, -75.4712.

What county is 18001 in?

18001 lies in Northampton County.

What area code is 18001?

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

What time zone is 18001 in?

18001 uses America/New_York.

What ZIP codes are near 18001?

The closest are 18003 (0 mi), 18016 (0 mi), 18067 (1.7 mi), 18032 (2.6 mi) and 18052 (3 mi).

Is 18001 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. “18001 ZIP Code — Lehigh Valley, Pennsylvania (Northampton County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/18001

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curl https://zipcodes.pro/zip/18001.json

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