ZIP Code 18031

18031 is one of Pennsylvania's ZIP codes, delivering to addresses in Breinigsville, Lehigh County.

City: Breinigsville
County: Lehigh County
State: Pennsylvania
Prefix: 180xx

Where this code sits

18031 is part of the 180xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Breinigsville.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 18031 delivers to without sharing its boundary.

ZIP codes nearest 18031

The ZIP codes whose reference points sit closest to 18031.
ZIP code	Distance	Delivers to
ZIP code 19538	1.9 mi	Maxatawny, PA
ZIP code 18195	2.7 mi	Allentown, PA
ZIP code 18051	2.8 mi	Fogelsville, PA
ZIP code 18087	3.1 mi	Trexlertown, PA
ZIP code 18011	3.8 mi	Alburtis, PA
ZIP code 18106	3.9 mi	Allentown, PA
ZIP code 19539	4.1 mi	Mertztown, PA
ZIP code 19562	4.2 mi	Topton, 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 18031, plotted from its record coordinates.

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

Scope ZIP code 18031. 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.