ZIP Code 57720

57720 is one of South Dakota's ZIP codes, delivering to addresses in Buffalo, Harding County.

City: Buffalo
County: Harding County
State: South Dakota
Prefix: 577xx

Where this code sits

57720 is part of the 577xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Buffalo.

Buffalo South Dakota ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 57720 delivers to without sharing its boundary.

605 Area code 605

ZIP codes nearest 57720

The ZIP codes whose reference points sit closest to 57720.
ZIP code	Distance	Delivers to
ZIP code 57776	21 mi	Redig, SD
ZIP code 57755	21 mi	Ludlow, SD
ZIP code 57724	22 mi	Camp Crook, SD
ZIP code 57651	25 mi	Reva, SD
ZIP code 59319	25 mi	Capitol, MT
ZIP code 57650	33 mi	Ralph, SD
ZIP code 58651	41 mi	Rhame, ND
ZIP code 58653	42 mi	Scranton, ND

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 57720, plotted from its record coordinates.

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

Scope ZIP code 57720. 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.