| ZIP Codes: | 7 ZIP Codes (6 Standard, 0 PO Box, 1 Unique) [See All] |
| Area Codes: | 507 / 605 / 924 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 2:13:43 PM |
| Population: | 26,197 [See All] |
| FIPS: | 46081 |
| CBSA: | Spearfish, SD |
| Land Area: | 862 sq mi |
| Water Area: | 5 sq mi |
| Coordinates: | 44.3950, -103.7503 |
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26,197 residents live across 7 ZIPs covering 862 sq mi, served by 6 distinct USPS-recognized cities.
Population moved from 23,981 to 26,197 from 2014 to 2024 — a +9.2% change. 4 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 57793 (Whitewood, $87,351 median) and poorest ZIP 57732 (Deadwood, $43,636) are 20.3 miles apart — a 2.0× income gap across local geography.
Median home values vary 2.5× across this county — from $218,000 in 57754 (Lead) to $555,600 in 57759 (Nemo).
Density varies 480× across the county — from 6 people/sq mi in 57759 (Nemo) to 3,012 in 57799 (Spearfish).
Educational attainment ranges from 18.8% bachelor's+ in 57793 (Whitewood) to 67.4% in 57779 (Saint Onge) — the breadth of educational profiles across the area.
Within South Dakota, this is the #8 most populous of 82 counties and ranks #55 for median household income with the #15 fastest decade growth .
Hosts 1 single-entity Unique ZIP: 57799Black Hills State University .
Weighted by population, the typical household earns about $72,539 across the county — reflecting what a typical resident sees, not a simple ZIP average.
33.0% of adults age 25+ hold a bachelor's degree or higher (6,283 of 19,049 reporting). The most-educated ZIPs cluster around Spearfish.
6 Standard delivery, 0 PO Box only, 1 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.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 57783 | Spearfish | Standard | 17,248 | $74,844 | 206.9 | 18.8% |
| 57754 | Lead | Standard | 3,749 | $66,250 | 296.6 | 10.0% |
| 57793 | Whitewood | Standard | 2,173 | $87,351 | 136.6 | -3.5% |
| 57732 | Deadwood | Standard | 1,714 | $43,636 | 120.5 | -25.4% |
| 57799 | Spearfish | Unique | 568 | — | 0.2 | 6.4% |
| 57759 | Nemo | Standard | 398 | $75,500 | 63.4 | -47.8% |
| 57779 | Saint Onge | Standard | 347 | — | 37.9 | 62.9% |