Columbia County ZIP Codes

Columbia County is a county of Pennsylvania.

ZIP codes: 11
Cities & towns: 11
Area codes: 2
Land area: 483 sq mi

Every ZIP code in Columbia County

178xx–186xx

The complete list of Columbia County, PA ZIP codes with the city each one delivers to.
ZIP code	City
17814	Benton
17815	Bloomsburg
17820	Catawissa
17846	Millville
17858	Numidia
17859	Orangeville
17878	Stillwater
17888	Wilburton
17920	Aristes
18603	Berwick
18631	Mifflinville

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Columbia County codes above are listed without a column we would have to invent.

Cities and towns in Columbia County

A further 4 places in Columbia County appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.

Area codes covering Columbia County

Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.

Where Columbia County's ZIP codes sit

Each point is the reference point of one Columbia County ZIP code, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.

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

Scope every ZIP code recorded in Columbia County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated 16 July 2026. The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.