Cass County ZIP Codes

Cass County is a county of North Dakota.

ZIP codes: 34
Cities & towns: 22
Area codes: 1
Land area: 1,765 sq mi

Every ZIP code in Cass County

580xx–581xx

The complete list of Cass County, ND ZIP codes with the city each one delivers to.
ZIP code	City
58002	Absaraka
58004	Amenia
58005	Argusville
58006	Arthur
58007	Ayr
58011	Buffalo
58012	Casselton
58021	Davenport
58029	Erie
58036	Gardner
58038	Grandin
58042	Harwood
58047	Horace
58048	Hunter
58051	Kindred
58052	Leonard
58059	Mapleton
58064	Page
58071	Tower City
58078	West Fargo
58079	Wheatland
58102	Fargo
58103	Fargo
58104	Fargo
58105	Fargo
58106	Fargo
58107	Fargo
58108	Fargo
58109	Fargo
58121	Fargo
58122	Fargo
58124	Fargo
58125	Fargo
58126	Fargo

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Cass County codes above are listed without a column we would have to invent.

Cities and towns in Cass County

A further 3 places in Cass 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 Cass County

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

701 Area code 701

Where Cass County's ZIP codes sit

Each point is the reference point of one Cass 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 Cass 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.