| ZIP Codes: | 5 ZIP Codes (4 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Code: | 308 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 11:14:55 PM |
| Population: | 1,727 [See All] |
| FIPS: | 31165 |
| Land Area: | 2,176 sq mi |
| Water Area: | 1 sq mi |
| Coordinates: | 43.4262, -103.8964 |
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8,156 residents live across 5 ZIPs covering 2,176 sq mi, served by 5 distinct USPS-recognized cities.
Population moved from 7,708 to 8,156 from 2014 to 2024 — a +5.8% change. 4 ZIPs gained residents, 1 lost.
The county's wealthiest ZIP 57766 (Oral, $96,146 median) and poorest ZIP 57782 (Smithwick, $65,500) are 9.2 miles apart — a 1.5× income gap across local geography.
Median home values vary 2.2× across this county — from $122,700 in 57763 (Oelrichs) to $270,500 in 57782 (Smithwick).
Density varies 15× across the county — from 1 people/sq mi in 57763 (Oelrichs) to 11 in 57747 (Hot Springs).
Educational attainment ranges from 22.9% bachelor's+ in 57735 (Edgemont) to 40.4% in 57763 (Oelrichs) — the breadth of educational profiles across the area.
Within South Dakota, this is the #60 most populous of 77 counties and ranks #45 for median household income with the #4 fastest decade growth .
Weighted by population, the typical household earns about $69,940 across the county — reflecting what a typical resident sees, not a simple ZIP average.
28.9% of adults age 25+ hold a bachelor's degree or higher (1,899 of 6,565 reporting).
4 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.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.