ZIP Code 15621

15621 is one of Pennsylvania's ZIP codes, delivering to addresses in Calumet, Westmoreland County.

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

Where this code sits

15621 is part of the 156xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Calumet.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 15621 delivers to without sharing its boundary.

ZIP codes nearest 15621

The ZIP codes whose reference points sit closest to 15621.
ZIP code	Distance	Delivers to
ZIP code 15674	0.4 mi	Norvelt, PA
ZIP code 15689	0.5 mi	United, PA
ZIP code 15676	2.7 mi	Pleasant Unity, PA
ZIP code 15666	2.9 mi	Mount Pleasant, PA
ZIP code 15616	3.6 mi	Armbrust, PA
ZIP code 15693	4.9 mi	Whitney, PA
ZIP code 15639	5.1 mi	Hunker, PA
ZIP code 15697	5.5 mi	Youngwood, 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 15621, plotted from its record coordinates.

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

Scope ZIP code 15621. 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.