ZIP Code 16635

16635 is one of Pennsylvania's ZIP codes, delivering to addresses in Duncansville, Blair County.

City: Duncansville
County: Blair County
State: Pennsylvania
Prefix: 166xx

Where this code sits

16635 is part of the 166xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Duncansville.

Duncansville Pennsylvania ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 16635 delivers to without sharing its boundary.

ZIP codes nearest 16635

The ZIP codes whose reference points sit closest to 16635.
ZIP code	Distance	Delivers to
ZIP code 16665	2.3 mi	Newry, PA
ZIP code 16648	3.8 mi	Hollidaysburg, PA
ZIP code 16603	5.4 mi	Altoona, PA
ZIP code 16602	6.0 mi	Altoona, PA
ZIP code 16601	6.7 mi	Altoona, PA
ZIP code 16637	6.8 mi	East Freedom, PA
ZIP code 16641	7.1 mi	Gallitzin, PA
ZIP code 16673	7.2 mi	Roaring Spring, 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 16635, plotted from its record coordinates.

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

Scope ZIP code 16635. 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.