ZIP Code 17866

17866 is one of Pennsylvania's ZIP codes, delivering to addresses in Coal Township, Northumberland County.

City: Coal Township
County: Northumberland County
State: Pennsylvania
Prefix: 178xx

Where this code sits

17866 is part of the 178xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Coal Township.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 17866 delivers to without sharing its boundary.

ZIP codes nearest 17866

The ZIP codes whose reference points sit closest to 17866.
ZIP code	Distance	Delivers to
ZIP code 17872	0.4 mi	Shamokin, PA
ZIP code 17834	4.1 mi	Kulpmont, PA
ZIP code 17832	4.6 mi	Marion Heights, PA
ZIP code 17824	5.0 mi	Elysburg, PA
ZIP code 17860	5.7 mi	Paxinos, PA
ZIP code 17840	6.1 mi	Locust Gap, PA
ZIP code 17964	6.2 mi	Pitman, PA
ZIP code 17881	6.2 mi	Trevorton, 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 17866, plotted from its record coordinates.

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

Scope ZIP code 17866. 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.