ZIP Code 57657

57657 is one of South Dakota's ZIP codes, delivering to addresses in Trail City, Corson County.

City: Trail City
County: Corson County
State: South Dakota
Prefix: 576xx

Where this code sits

57657 is part of the 576xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Trail City.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 57657 delivers to without sharing its boundary.

605 Area code 605

ZIP codes nearest 57657

The ZIP codes whose reference points sit closest to 57657.
ZIP code	Distance	Delivers to
ZIP code 57630	9.6 mi	Glencross, SD
ZIP code 57639	15 mi	Little Eagle, SD
ZIP code 57601	15 mi	Mobridge, SD
ZIP code 57656	16 mi	Timber Lake, SD
ZIP code 57661	16 mi	Whitehorse, SD
ZIP code 57658	18 mi	Wakpala, SD
ZIP code 57652	20 mi	Ridgeview, SD
ZIP code 57631	22 mi	Glenham, 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 57657, plotted from its record coordinates.

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

Scope ZIP code 57657. 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.