Brown County ZIP Codes

Brown County is a county of South Dakota.

ZIP codes: 14
Cities & towns: 13
Area codes: 1
Land area: 1,713 sq mi

Every ZIP code in Brown County

574xx

The complete list of Brown County, SD ZIP codes with the city each one delivers to.
ZIP code	City
57401	Aberdeen
57402	Aberdeen
57426	Barnard
57427	Bath
57432	Claremont
57433	Columbia
57439	Ferney
57441	Frederick
57445	Groton
57446	Hecla
57449	Houghton
57474	Stratford
57479	Warner
57481	Westport

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Brown County

A further 4 places in Brown 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 Brown County

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

605 Area code 605

Where Brown County's ZIP codes sit

Each point is the reference point of one Brown 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 Brown 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.