ZIP Code 15664

15664 is one of Pennsylvania's ZIP codes, delivering to addresses in Mammoth, Westmoreland County.

City: Mammoth
County: Westmoreland County
State: Pennsylvania
Prefix: 156xx

Where this code sits

15664 is part of the 156xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Mammoth.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 15664 delivers to without sharing its boundary.

ZIP codes nearest 15664

The ZIP codes whose reference points sit closest to 15664.
ZIP code	Distance	Delivers to
ZIP code 15634	1.1 mi	Grapeville, PA
ZIP code 15644	1.3 mi	Jeannette, PA
ZIP code 15675	1.8 mi	Penn, PA
ZIP code 15611	2.1 mi	Adamsburg, PA
ZIP code 15665	3.2 mi	Manor, PA
ZIP code 15692	3.6 mi	Westmoreland City, PA
ZIP code 15617	3.7 mi	Arona, PA
ZIP code 15691	3.8 mi	Wendel, 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 15664, plotted from its record coordinates.

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

Scope ZIP code 15664. 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.