ZIP Code 18421

18421 is one of Pennsylvania's ZIP codes, delivering to addresses in Forest City, Susquehanna County.

City: Forest City
County: Susquehanna County
State: Pennsylvania
Prefix: 184xx

Where this code sits

18421 is part of the 184xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Forest City.

Forest City Pennsylvania ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 18421 delivers to without sharing its boundary.

ZIP codes nearest 18421

The ZIP codes whose reference points sit closest to 18421.
ZIP code	Distance	Delivers to
ZIP code 18407	5.1 mi	Carbondale, PA
ZIP code 18470	5.7 mi	Union Dale, PA
ZIP code 18430	6.4 mi	Herrick Center, PA
ZIP code 18472	6.4 mi	Waymart, PA
ZIP code 18453	6.6 mi	Pleasant Mount, PA
ZIP code 18413	6.8 mi	Clifford, PA
ZIP code 18433	8.2 mi	Jermyn, PA
ZIP code 18441	8.4 mi	Lenoxville, 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 18421, plotted from its record coordinates.

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

Scope ZIP code 18421. 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.