ZIP Code 16623

16623 is one of Pennsylvania's ZIP codes, delivering to addresses in Cassville, Huntingdon County.

City: Cassville
County: Huntingdon County
State: Pennsylvania
Prefix: 166xx

Where this code sits

16623 is part of the 166xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Cassville.

Cassville Pennsylvania ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 16623 delivers to without sharing its boundary.

ZIP codes nearest 16623

The ZIP codes whose reference points sit closest to 16623.
ZIP code	Distance	Delivers to
ZIP code 16622	3.0 mi	Calvin, PA
ZIP code 16685	3.1 mi	Todd, PA
ZIP code 17253	5.7 mi	Saltillo, PA
ZIP code 17052	7.3 mi	Mapleton Depot, PA
ZIP code 17243	7.4 mi	Orbisonia, PA
ZIP code 17249	7.7 mi	Rockhill Furnace, PA
ZIP code 17264	7.8 mi	Three Springs, PA
ZIP code 17260	8.1 mi	Shirleysburg, 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 16623, plotted from its record coordinates.

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

Scope ZIP code 16623. 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.