Every ZIP code in McCook County

570xx–573xx

The complete list of McCook County, SD ZIP codes with the city each one delivers to.
ZIP code	City
57012	Canistota
57048	Montrose
57058	Salem
57319	Bridgewater
57374	Spencer

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in McCook County

Area codes covering McCook County

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

Where McCook County's ZIP codes sit

Each point is the reference point of one McCook 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 McCook 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.