ZIP Code 17878

17878 is one of Pennsylvania's ZIP codes, delivering to addresses in Stillwater, Columbia County.

City: Stillwater
County: Columbia County
State: Pennsylvania
Prefix: 178xx

Where this code sits

17878 is part of the 178xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Stillwater.

Stillwater Pennsylvania ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 17878 delivers to without sharing its boundary.

ZIP codes nearest 17878

The ZIP codes whose reference points sit closest to 17878.
ZIP code	Distance	Delivers to
ZIP code 17859	3.5 mi	Orangeville, PA
ZIP code 18611	4.6 mi	Cambra, PA
ZIP code 17814	5.2 mi	Benton, PA
ZIP code 18622	7.6 mi	Huntington Mills, PA
ZIP code 17846	8.1 mi	Millville, PA
ZIP code 18603	8.8 mi	Berwick, PA
ZIP code 18631	8.8 mi	Mifflinville, PA
ZIP code 17774	10 mi	Unityville, 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 17878, plotted from its record coordinates.

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

Scope ZIP code 17878. 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.