ZIP Code 18991

18991 is one of Pennsylvania's ZIP codes, delivering to addresses in Warminster, Bucks County.

City: Warminster
County: Bucks County
State: Pennsylvania
Prefix: 189xx

Where this code sits

18991 is part of the 189xx range, the group of codes handled by one mail processing centre. Warminster is served by 2 ZIP codes in total.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 18991 delivers to without sharing its boundary.

ZIP codes nearest 18991

The ZIP codes whose reference points sit closest to 18991.
ZIP code	Distance	Delivers to
ZIP code 18931	0.0 mi	Lahaska, PA
ZIP code 18933	0.0 mi	Lumberville, PA
ZIP code 18902	1.4 mi	Doylestown, PA
ZIP code 18912	2.3 mi	Buckingham, PA
ZIP code 18934	2.3 mi	Mechanicsville, PA
ZIP code 18916	2.4 mi	Danboro, PA
ZIP code 18901	2.9 mi	Doylestown, PA
ZIP code 18925	3.1 mi	Furlong, PA

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 18991, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 18991. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.