| ZIP Codes: | 10 ZIP Codes (8 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Code: | 605 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 11:14:55 PM |
| Population: | 1,297 [See All] |
| FIPS: | 46031 |
| Land Area: | 1,851 sq mi |
| Water Area: | 13 sq mi |
| Coordinates: | 45.7066, -101.0307 |
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3,776 residents live across 10 ZIPs covering 1,851 sq mi, served by 10 distinct USPS-recognized cities.
Population moved from 4,063 to 3,760 from 2014 to 2024 — a -7.5% change. 4 ZIPs gained residents, 5 lost.
The county's wealthiest ZIP 57634 (Keldron, $88,125 median) and poorest ZIP 57639 (Little Eagle, $21,250) are 52.5 miles apart — a 4.1× income gap across local geography.
Median home values vary 2.9× across this county — from $52,100 in 57645 (Morristown) to $151,600 in 57634 (Keldron).
Density varies 303× across the county — from 1 people/sq mi in 57634 (Keldron) to 205 in 57639 (Little Eagle).
Educational attainment ranges from 8.9% bachelor's+ in 57621 (Bullhead) to 45.9% in 57634 (Keldron) — the breadth of educational profiles across the area.
Within South Dakota, this is the #64 most populous of 77 counties and ranks #72 for median household income .
Weighted by population, the typical household earns about $53,233 across the county — reflecting what a typical resident sees, not a simple ZIP average.
19.2% of adults age 25+ hold a bachelor's degree or higher (396 of 2,066 reporting).
8 Standard delivery, 2 PO Box only, 0 single-entity Unique ZIPs serve this county.
Median household income spans 4.1× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
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.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 57642 | Mc Laughlin | Standard | 1,969 | $58,750 | 628.7 | -7.4% |
| 57658 | Wakpala | Standard | 319 | $23,000 | 118.7 | 10.8% |
| 57621 | Bullhead | PO Box | 294 | $32,589 | 12.8 | -23.4% |
| 57639 | Little Eagle | PO Box | 290 | $21,250 | 1.4 | -17.4% |
| 57657 | Trail City | Standard | 247 | — | 319.0 | 11.8% |
| 57641 | Mc Intosh | Standard | 215 | $83,750 | 240.0 | -26.6% |
| 57645 | Morristown | Standard | 184 | $56,667 | 158.2 | -8.9% |
| 57634 | Keldron | Standard | 131 | $88,125 | 194.2 | 8.3% |
| 57660 | Cross State | Standard | 111 | $67,292 | 160.7 | 44.2% |
| 57659 | Walker | Standard | 16 | $103,333 | 17.6 | — |