| ZIP Codes: | 6 ZIP Codes (5 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Code: | 406 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 2:13:42 PM |
| Population: | 1,115 [See All] |
| FIPS: | 30011 |
| Land Area: | 2,407 sq mi |
| Water Area: | 4 sq mi |
| Coordinates: | 45.4508, -104.5590 |
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994 residents live across 6 ZIPs covering 2,407 sq mi, served by 6 distinct USPS-recognized cities.
Population moved from 1,116 to 994 from 2014 to 2024 — a -10.9% change. 2 ZIPs gained residents, 3 lost (and 1 held flat).
The county's wealthiest ZIP 57651 (Reva, $94,559 median) and poorest ZIP 57724 (Camp Crook, $61,146) are 47.0 miles apart — a 1.5× income gap across local geography.
Median home values vary 1.4× across this county — from $157,000 in 57720 (Buffalo) to $212,500 in 57651 (Reva).
Density varies 2× across the county — from 0 people/sq mi in 57755 (Ludlow) to 1 in 57724 (Camp Crook).
Educational attainment ranges from 25.0% bachelor's+ in 57720 (Buffalo) to 40.1% in 57724 (Camp Crook) — the breadth of educational profiles across the area.
Within South Dakota, this is the #52 most populous of 56 counties and ranks #48 for median household income .
Weighted by population, the typical household earns about $77,914 across the county — reflecting what a typical resident sees, not a simple ZIP average.
30.2% of adults age 25+ hold a bachelor's degree or higher (222 of 734 reporting).
5 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.