ZIP Code 57520

57520 is one of South Dakota's ZIP codes, delivering to addresses in Agar, Sully County.

City: Agar
County: Sully County
State: South Dakota
Prefix: 575xx

Where this code sits

57520 is part of the 575xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Agar.

Agar South Dakota ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 57520 delivers to without sharing its boundary.

605 Area code 605

ZIP codes nearest 57520

The ZIP codes whose reference points sit closest to 57520.
ZIP code	Distance	Delivers to
ZIP code 57564	8.8 mi	Onida, SD
ZIP code 57442	14 mi	Gettysburg, SD
ZIP code 57455	20 mi	Lebanon, SD
ZIP code 57522	24 mi	Blunt, SD
ZIP code 57536	27 mi	Harrold, SD
ZIP code 57450	31 mi	Hoven, SD
ZIP code 57475	32 mi	Tolstoy, SD
ZIP code 57540	32 mi	Holabird, 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 57520, plotted from its record coordinates.

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

Scope ZIP code 57520. 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.