ZIP Code 16421

16421 is one of Pennsylvania's ZIP codes, delivering to addresses in Harborcreek, Erie County.

City: Harborcreek
County: Erie County
State: Pennsylvania
Prefix: 164xx

Where this code sits

16421 is part of the 164xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Harborcreek.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 16421 delivers to without sharing its boundary.

ZIP codes nearest 16421

The ZIP codes whose reference points sit closest to 16421.
ZIP code	Distance	Delivers to
ZIP code 16511	4.2 mi	Erie, PA
ZIP code 16563	4.6 mi	Erie, PA
ZIP code 16510	4.7 mi	Erie, PA
ZIP code 16428	5.8 mi	North East, PA
ZIP code 16514	6.3 mi	Erie, PA
ZIP code 16515	6.3 mi	Erie, PA
ZIP code 16531	6.3 mi	Erie, PA
ZIP code 16544	6.3 mi	Erie, 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 16421, plotted from its record coordinates.

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

Scope ZIP code 16421. 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.