ZIP Code 57661

57661 is one of South Dakota's ZIP codes, delivering to addresses in Whitehorse, Dewey County.

City: Whitehorse
County: Dewey County
State: South Dakota
Prefix: 576xx

Where this code sits

57661 is part of the 576xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Whitehorse.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 57661 delivers to without sharing its boundary.

605 Area code 605

ZIP codes nearest 57661

The ZIP codes whose reference points sit closest to 57661.
ZIP code	Distance	Delivers to
ZIP code 57656	11 mi	Timber Lake, SD
ZIP code 57630	12 mi	Glencross, SD
ZIP code 57652	15 mi	Ridgeview, SD
ZIP code 57657	16 mi	Trail City, SD
ZIP code 57625	25 mi	Eagle Butte, SD
ZIP code 57633	28 mi	Isabel, SD
ZIP code 57639	28 mi	Little Eagle, SD
ZIP code 57601	29 mi	Mobridge, 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 57661, plotted from its record coordinates.

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

Scope ZIP code 57661. 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.