Grassland Colony ZIP codes, South Dakota
No ZIP code is named for Grassland Colony, SD; addresses there use a neighbouring town's name. The ZIP code covering it is 57481. Its area code is 605.
- USPS city name
- 0 ZIP codes
- Overlapping the city
- 1 more
- Population
- 15
- Area code
- 605
- County
- Brown County
- State
- South Dakota
NANPA lists no telephone rate centre for Grassland Colony itself, so these are the area codes of the nearest one, Frederick (14.0 miles). A town on an area-code boundary can differ from its neighbour.
ZIP codes covering Grassland Colony
These ZIP codes cover part of Grassland Colony but are addressed as somewhere else.
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
57481 | Westport , SD | Standard | 271 | $68,125 | $215,600 |
Map of Grassland Colony ZIP codes
The ZIP codes of Grassland Colony, SD, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.
Towns near Grassland Colony
The nearest larger towns are Leola (381 people, 7.8 mi), Westport (93 people, 14 mi) and Mina (767 people, 15 mi).
| Town | Population | Distance |
|---|---|---|
| Aberdeen | 28,189 | 21.2 mi |
More nearby: every ZIP code in Brown County · South Dakota ZIP codes
Cite this page
zipcodes.pro. “Grassland Colony, SD ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/sd/grassland-colony
Underlying data is public domain or openly licensed — sources, vintages and licences.