ZIP Code 18820

18820 is one of Pennsylvania's ZIP codes, delivering to addresses in Gibson, Susquehanna County.

City: Gibson
County: Susquehanna County
State: Pennsylvania
Prefix: 188xx

Where this code sits

18820 is part of the 188xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Gibson.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 18820 delivers to without sharing its boundary.

ZIP codes nearest 18820

The ZIP codes whose reference points sit closest to 18820.
ZIP code	Distance	Delivers to
ZIP code 18823	3.2 mi	Harford, PA
ZIP code 18842	4.8 mi	South Gibson, PA
ZIP code 18834	5.8 mi	New Milford, PA
ZIP code 18465	6.0 mi	Thompson, PA
ZIP code 18826	7.6 mi	Kingsley, PA
ZIP code 18470	8.3 mi	Union Dale, PA
ZIP code 18825	8.3 mi	Jackson, PA
ZIP code 18430	9.0 mi	Herrick Center, 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 18820, plotted from its record coordinates.

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

Scope ZIP code 18820. 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.