ZIP Code 57231

57231 is one of South Dakota's ZIP codes, delivering to addresses in De Smet, Kingsbury County.

City: De Smet
County: Kingsbury County
State: South Dakota
Prefix: 572xx

Where this code sits

57231 is part of the 572xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to De Smet.

De Smet South Dakota ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 57231 delivers to without sharing its boundary.

605 Area code 605

ZIP codes nearest 57231

The ZIP codes whose reference points sit closest to 57231.
ZIP code	Distance	Delivers to
ZIP code 57249	9.0 mi	Lake Preston, SD
ZIP code 57233	11 mi	Erwin, SD
ZIP code 57353	15 mi	Iroquois, SD
ZIP code 57221	16 mi	Bryant, SD
ZIP code 57051	17 mi	Oldham, SD
ZIP code 57278	18 mi	Willow Lake, SD
ZIP code 57323	18 mi	Carthage, SD
ZIP code 57214	19 mi	Badger, SD

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 57231, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 57231. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.