ZIP Code 57751

57751 is one of South Dakota's ZIP codes, delivering to addresses in Keystone, Pennington County.

City: Keystone
County: Pennington County
State: South Dakota
Prefix: 577xx

Where this code sits

57751 is part of the 577xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Keystone.

Keystone South Dakota ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 57751 delivers to without sharing its boundary.

605 Area code 605

ZIP codes nearest 57751

The ZIP codes whose reference points sit closest to 57751.
ZIP code	Distance	Delivers to
ZIP code 57702	8.5 mi	Rapid City, SD
ZIP code 57745	9.6 mi	Hill City, SD
ZIP code 57744	11 mi	Hermosa, SD
ZIP code 57709	14 mi	Rapid City, SD
ZIP code 57730	16 mi	Custer, SD
ZIP code 57703	16 mi	Rapid City, SD
ZIP code 57738	18 mi	Fairburn, SD
ZIP code 57718	19 mi	Black Hawk, 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 57751, plotted from its record coordinates.

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

Scope ZIP code 57751. 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.