Every ZIP code in Yankton County

570xx

The complete list of Yankton County, SD ZIP codes with the city each one delivers to.
ZIP code	City
57031	Gayville
57040	Lesterville
57046	Mission Hill
57067	Utica
57072	Volin
57078	Yankton

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Yankton County

Area codes covering Yankton County

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

Where Yankton County's ZIP codes sit

Each point is the reference point of one Yankton 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 Yankton 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.