ZIP Code 57645

57645 is one of South Dakota's ZIP codes, delivering to addresses in Morristown, Corson County.

City: Morristown
County: Corson County
State: South Dakota
Prefix: 576xx

Where this code sits

57645 is part of the 576xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Morristown.

Morristown South Dakota ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 57645 delivers to without sharing its boundary.

605 Area code 605

ZIP codes nearest 57645

The ZIP codes whose reference points sit closest to 57645.
ZIP code	Distance	Delivers to
ZIP code 57660	10 mi	Watauga, SD
ZIP code 57634	15 mi	Keldron, SD
ZIP code 57638	23 mi	Lemmon, SD
ZIP code 58569	28 mi	Shields, ND
ZIP code 58568	28 mi	Selfridge, ND
ZIP code 58533	30 mi	Elgin, ND
ZIP code 57659	31 mi	Walker, SD
ZIP code 57641	32 mi	Mc Intosh, 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 57645, plotted from its record coordinates.

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

Scope ZIP code 57645. 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.