ZIP Code 57766

57766 is one of South Dakota's ZIP codes, delivering to addresses in Oral, Fall River County.

City: Oral
County: Fall River County
State: South Dakota
Prefix: 577xx

Where this code sits

57766 is part of the 577xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Oral.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 57766 delivers to without sharing its boundary.

605 Area code 605

ZIP codes nearest 57766

The ZIP codes whose reference points sit closest to 57766.
ZIP code	Distance	Delivers to
ZIP code 57782	6.2 mi	Smithwick, SD
ZIP code 57722	10 mi	Buffalo Gap, SD
ZIP code 57747	15 mi	Hot Springs, SD
ZIP code 57763	16 mi	Oelrichs, SD
ZIP code 57738	19 mi	Fairburn, SD
ZIP code 57730	22 mi	Custer, SD
ZIP code 57773	26 mi	Pringle, SD
ZIP code 57764	26 mi	Oglala, 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 57766, plotted from its record coordinates.

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

Scope ZIP code 57766. 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.