ZIP Code 16821

16821 is one of Pennsylvania's ZIP codes, delivering to addresses in Allport, Clearfield County.

City: Allport
County: Clearfield County
State: Pennsylvania
Prefix: 168xx

Where this code sits

16821 is part of the 168xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Allport.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 16821 delivers to without sharing its boundary.

ZIP codes nearest 16821

The ZIP codes whose reference points sit closest to 16821.
ZIP code	Distance	Delivers to
ZIP code 16860	2.1 mi	Munson, PA
ZIP code 16847	2.6 mi	Kylertown, PA
ZIP code 16879	2.6 mi	Winburne, PA
ZIP code 16858	2.9 mi	Morrisdale, PA
ZIP code 16840	3.0 mi	Hawk Run, PA
ZIP code 16849	4.6 mi	Lanse, PA
ZIP code 16876	4.8 mi	Wallaceton, PA
ZIP code 16839	5.4 mi	Grassflat, 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 16821, plotted from its record coordinates.

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

Scope ZIP code 16821. 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.