ZIP Code 19451

19451 is one of Pennsylvania's ZIP codes, delivering to addresses in Mainland, Montgomery County.

City: Mainland
County: Montgomery County
State: Pennsylvania
Prefix: 194xx

Where this code sits

19451 is part of the 194xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Mainland.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 19451 delivers to without sharing its boundary.

ZIP codes nearest 19451

The ZIP codes whose reference points sit closest to 19451.
ZIP code	Distance	Delivers to
ZIP code 19404	0.0 mi	Norristown, PA
ZIP code 19407	0.0 mi	Audubon, PA
ZIP code 19450	0.0 mi	Lederach, PA
ZIP code 19484	0.0 mi	Valley Forge, PA
ZIP code 19423	0.6 mi	Cedars, PA
ZIP code 19490	1.3 mi	Worcester, PA
ZIP code 19443	2.1 mi	Kulpsville, PA
ZIP code 19474	2.7 mi	Skippack, 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 19451, plotted from its record coordinates.

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

Scope ZIP code 19451. 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.