Foster County ZIP Codes

Foster County is a county of North Dakota.

ZIP codes: 4
Cities & towns: 4
Area codes: 1
Land area: 634 sq mi

Every ZIP code in Foster County

584xx

The complete list of Foster County, ND ZIP codes with the city each one delivers to.
ZIP code	City
58421	Carrington
58443	Glenfield
58445	Grace City
58464	Mchenry

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Foster County

Area codes covering Foster 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 Foster County's ZIP codes sit

Each point is the reference point of one Foster 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 Foster 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.