| ZIP Codes: | 2 ZIP Codes (2 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Code: | 605 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:13:41 PM |
| Population: | 1,469 [See All] |
| FIPS: | 46017 |
| Land Area: | 324 sq mi |
| Water Area: | 11 sq mi |
| Coordinates: | 44.0807, -99.2999 |
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1,469 residents live across 2 ZIPs covering 324 sq mi, served by 2 distinct USPS-recognized cities.
Population moved from 1,713 to 1,469 from 2014 to 2024 — a -14.2% change. 0 ZIPs gained residents, 2 lost.
The county's wealthiest ZIP 57339 (Fort Thompson, $46,136 median) and poorest ZIP 57339 (Fort Thompson, $46,136) are 0.0 miles apart — a 1.0× income gap across local geography.
Density varies 67× across the county — from 0 people/sq mi in 57341 (Gann Valley) to 21 in 57339 (Fort Thompson).
Within South Dakota, this is the #65 most populous of 82 counties and ranks #80 for median household income .
Weighted by population, the typical household earns about $46,136 across the county — reflecting what a typical resident sees, not a simple ZIP average.
10.2% of adults age 25+ hold a bachelor's degree or higher (68 of 668 reporting).
2 Standard delivery, 0 PO Box only, 0 single-entity Unique ZIPs serve this county.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
Buffalo County lost 14.2% of residents between 2014 and 2024. ZIPs that shed the largest share: