ZIP Code 16603

16603 is one of Pennsylvania's ZIP codes, delivering to addresses in Altoona, Blair County.

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

Where this code sits

16603 is part of the 166xx range, the group of codes handled by one mail processing centre. Altoona is served by 3 ZIP codes in total; the full list, with the county each falls in, is on the Altoona page.

Altoona Pennsylvania ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 16603 delivers to without sharing its boundary.

ZIP codes nearest 16603

The ZIP codes whose reference points sit closest to 16603.
ZIP code	Distance	Delivers to
ZIP code 16602	1.1 mi	Altoona, PA
ZIP code 16601	1.3 mi	Altoona, PA
ZIP code 16648	4.9 mi	Hollidaysburg, PA
ZIP code 16635	5.4 mi	Duncansville, PA
ZIP code 16629	6.3 mi	Coupon, PA
ZIP code 16613	7.4 mi	Ashville, PA
ZIP code 16641	7.6 mi	Gallitzin, PA
ZIP code 16665	7.6 mi	Newry, 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 16603, plotted from its record coordinates.

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

Scope ZIP code 16603. 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.