ZIP Code 57278

57278 is one of South Dakota's ZIP codes, delivering to addresses in Willow Lake, Clark County.

City: Willow Lake
County: Clark County
State: South Dakota
Prefix: 572xx

Where this code sits

57278 is part of the 572xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Willow Lake.

Willow Lake South Dakota ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 57278 delivers to without sharing its boundary.

605 Area code 605

ZIP codes nearest 57278

The ZIP codes whose reference points sit closest to 57278.
ZIP code	Distance	Delivers to
ZIP code 57271	10 mi	Vienna, SD
ZIP code 57221	11 mi	Bryant, SD
ZIP code 57322	12 mi	Carpenter, SD
ZIP code 57233	16 mi	Erwin, SD
ZIP code 57225	18 mi	Clark, SD
ZIP code 57231	18 mi	De Smet, SD
ZIP code 57386	19 mi	Yale, SD
ZIP code 57242	20 mi	Hazel, 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 57278, plotted from its record coordinates.

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

Scope ZIP code 57278. 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.