ZIP Code 15661

15661 is one of Pennsylvania's ZIP codes, delivering to addresses in Loyalhanna, Westmoreland County.

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

Where this code sits

15661 is part of the 156xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Loyalhanna.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 15661 delivers to without sharing its boundary.

ZIP codes nearest 15661

The ZIP codes whose reference points sit closest to 15661.
ZIP code	Distance	Delivers to
ZIP code 15620	0.9 mi	Bradenville, PA
ZIP code 15627	1.7 mi	Derry, PA
ZIP code 15671	2.7 mi	New Derry, PA
ZIP code 15696	3.0 mi	Youngstown, PA
ZIP code 15650	3.3 mi	Latrobe, PA
ZIP code 15638	4.4 mi	Hostetter, PA
ZIP code 15605	5.0 mi	Greensburg, PA
ZIP code 15685	5.0 mi	Southwest, 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 15661, plotted from its record coordinates.

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

Scope ZIP code 15661. 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.