18991

ZIP 18991 is in Warminster, Pennsylvania, in Bucks County; area codes 267, 215 and 445; Eastern time. Warminster has 2 ZIP codes; the other is 18974.

Type: No street area
Time zone: America/New_York
County: Bucks
Metro area: Philadelphia-Camden-Wilmington, PA-NJ-DE-MD
Coordinates: 40.3286, -75.1028

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 18902, whose figures describe that area — not this ZIP code.

☼ Live from 18991 — Warminster, PA

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Where 18991 is

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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 18991

🔢 Type 18991 into a pocket calculator and turn it upside down: IGGBI — not quite a word, sorry.
➕ As a number, 18,991 = 7 × 2713. Its digits add up to 28, a total 1,520 other ZIP codes share.
💾In binary, the way a computer stores it: 100101000101111
🏠 Its numerical neighbours: 18981 (Zionhill, PA, 19 mi away) and 19001 (Abington, PA, 14 mi away).
🔄 Backwards, 18991 becomes 19981, which is not a ZIP code at all.
👥 9 other ZIP codes are made of exactly the same digits (19891, 89119, 89191, 91189, 98119, 98191, …). The farthest-flung twin is 99811 in Juneau, AK, 2,831 miles away.
🧭 Farther north than 59% of all ZIP codes, and farther east than 87%.
🎯1,238 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
🌏 Dig straight through the Earth from 18991 and you would come out at 40.33°S, 104.90°E — 841 miles from Perth, Australia, the nearest big city to that spot.
☀Longest day of the year: 15h 03m of daylight. Shortest: 9h 17m.

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Land area

ZIP codes near 18991

ZIP	City	Distance
`18931`	Lahaska, PA	0.0 mi
`18902`	Doylestown, PA	1.7 mi
`18912`	Buckingham, PA	2.2 mi
`18934`	Mechanicsville, PA	2.3 mi
`18916`	Danboro, PA	2.4 mi
`18901`	Doylestown, PA	3.0 mi
`18928`	Holicong, PA	3.2 mi
`18922`	Forest Grove, PA	3.4 mi
`18925`	Furlong, PA	3.7 mi
`18923`	Fountainville, PA	3.8 mi

Find every ZIP code within 10 miles of 18991 →

Questions about this ZIP code

Where is ZIP code 18991?

18991 is in Warminster, Pennsylvania, in Bucks County, part of the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD metropolitan area. Its published point location is 40.3286, -75.1028.

What county is 18991 in?

18991 lies in Bucks County.

What area code is 18991?

Warminster uses area codes 267, 215 and 445, from NANPA's telephone records.

What time zone is 18991 in?

18991 uses America/New_York.

What ZIP codes are near 18991?

The closest are 18931 (0 mi), 18902 (1.7 mi), 18912 (2.2 mi), 18934 (2.3 mi) and 18916 (2.4 mi).

Is 18991 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. “18991 ZIP Code — Warminster, Pennsylvania (Bucks County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/18991

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/18991.json

Underlying data is public domain or openly licensed — sources, vintages and licences.