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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/19451

19451

ZIP 19451 is Mainland, Pennsylvania, in Montgomery County; Eastern time.

Type
No street area
Time zone
America/New_York
County
Montgomery
Coordinates
40.2119, -75.3559

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 19446, whose figures describe that area — not this ZIP code.

☼ Live from 19451 — Mainland, PA

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Where 19451 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 19451
  • 🔢 Type 19451 into a pocket calculator and turn it upside down: IShGI — not quite a word, sorry.
  • ➕ As a number, 19,451 = 53 × 367. Its digits add up to 20, a total 2,586 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 100101111111011
  • 🏠 Its numerical neighbours: 19450 (Lederach, PA, 0 mi away) and 19453 (Mont Clare, PA, 9 mi away).
  • 🔄 Backwards, 19451 becomes 15491, which is not a ZIP code at all.
  • 👥 21 other ZIP codes are made of exactly the same digits (11549, 11954, 14519, 14591, 15419, 19145, …). The farthest-flung twin is 94115 in San Francisco, CA, 2,504 miles away.
  • 🧭 Farther north than 58% of all ZIP codes, and farther east than 87%.
  • 🎯1,226 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 19451 and you would come out at 40.21°S, 104.64°E — 846 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 19451 today
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Source: USGS.

Land area

ZIP codes near 19451

ZIPCityDistance
19404 Norristown, PA 0.0 mi
19407 Audubon, PA 0.0 mi
19450 Lederach, PA 0.0 mi
19484 Valley Forge, PA 0.0 mi
19423 Cedars, PA 0.6 mi
19490 Worcester, PA 1.1 mi
19443 Kulpsville, PA 2.1 mi
19474 Skippack, PA 2.7 mi
19486 West Point, PA 2.9 mi
19446 Lansdale, PA 3.0 mi

Find every ZIP code within 10 miles of 19451 →

Questions about this ZIP code

Where is ZIP code 19451?

19451 is in Mainland, Pennsylvania, in Montgomery County, part of the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD metropolitan area. Its published point location is 40.2119, -75.3559.

What county is 19451 in?

19451 lies in Montgomery County.

What time zone is 19451 in?

19451 uses America/New_York.

What ZIP codes are near 19451?

The closest are 19404 (0 mi), 19407 (0 mi), 19450 (0 mi), 19484 (0 mi) and 19423 (0.6 mi).

Is 19451 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. “19451 ZIP Code — Mainland, Pennsylvania (Montgomery County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/19451

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/19451.json

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