ZIP Code 18850

18850 is one of Pennsylvania's ZIP codes, delivering to addresses in Ulster, Bradford County.

City: Ulster
County: Bradford County
State: Pennsylvania
Prefix: 188xx

Where this code sits

18850 is part of the 188xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Ulster.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 18850 delivers to without sharing its boundary.

ZIP codes nearest 18850

The ZIP codes whose reference points sit closest to 18850.
ZIP code	Distance	Delivers to
ZIP code 18831	4.5 mi	Milan, PA
ZIP code 18848	5.5 mi	Towanda, PA
ZIP code 18854	6.7 mi	Wysox, PA
ZIP code 18817	7.3 mi	East Smithfield, PA
ZIP code 18814	7.3 mi	Burlington, PA
ZIP code 18810	7.5 mi	Athens, PA
ZIP code 18832	8.8 mi	Monroeton, PA
ZIP code 18837	9.7 mi	Rome, 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 18850, plotted from its record coordinates.

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

Scope ZIP code 18850. 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.