ZIP Code 57420

57420 is one of South Dakota's ZIP codes, delivering to addresses in Akaska, Walworth County.

City: Akaska
County: Walworth County
State: South Dakota
Prefix: 574xx

Where this code sits

57420 is part of the 574xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Akaska.

Akaska South Dakota ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 57420 delivers to without sharing its boundary.

605 Area code 605

ZIP codes nearest 57420

The ZIP codes whose reference points sit closest to 57420.
ZIP code	Distance	Delivers to
ZIP code 57472	11 mi	Selby, SD
ZIP code 57631	16 mi	Glenham, SD
ZIP code 57452	17 mi	Java, SD
ZIP code 57450	18 mi	Hoven, SD
ZIP code 57601	21 mi	Mobridge, SD
ZIP code 57442	22 mi	Gettysburg, SD
ZIP code 57428	24 mi	Bowdle, SD
ZIP code 57646	24 mi	Mound City, 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 57420, plotted from its record coordinates.

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

Scope ZIP code 57420. 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.