| ZIP Codes: | 6 ZIP Codes (6 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Codes: | 605 / 701 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 11:55:02 PM |
| Population: | 3,704 [See All] |
| FIPS: | 46085 |
| Land Area: | 1,530 sq mi |
| Water Area: | 93 sq mi |
| Coordinates: | 43.9195, -99.8101 |
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3,704 residents live across 6 ZIPs covering 1,530 sq mi, served by 6 distinct USPS-recognized cities.
Population moved from 3,713 to 3,704 from 2014 to 2024 — a -0.2% change. 4 ZIPs gained residents, 2 lost.
The county's wealthiest ZIP 57576 (Vivian, $100,208 median) and poorest ZIP 57548 (Lower Brule, $35,750) are 35.5 miles apart — a 2.8× income gap across local geography.
Median home values vary 6.5× across this county — from $33,900 in 57548 (Lower Brule) to $219,600 in 57576 (Vivian).
Density varies 23× across the county — from 1 people/sq mi in 57576 (Vivian) to 19 in 57548 (Lower Brule).
Educational attainment ranges from 9.1% bachelor's+ in 57548 (Lower Brule) to 42.3% in 57576 (Vivian) — the breadth of educational profiles across the area.
Within South Dakota, this is the #42 most populous of 82 counties and ranks #41 for median household income .
Weighted by population, the typical household earns about $62,859 across the county — reflecting what a typical resident sees, not a simple ZIP average.
24.4% of adults age 25+ hold a bachelor's degree or higher (574 of 2,351 reporting).
6 Standard delivery, 0 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.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 57548 | Lower Brule | Standard | 1,442 | $35,750 | 75.5 | 0.1% |
| 57365 | Oacoma | Standard | 599 | $76,000 | 68.4 | 6.4% |
| 57568 | Presho | Standard | 540 | $83,188 | 432.1 | -17.3% |
| 57569 | Reliance | Standard | 497 | $74,722 | 392.5 | 28.4% |
| 57544 | Kennebec | Standard | 421 | $78,750 | 318.7 | -19.7% |
| 57576 | Vivian | Standard | 205 | $100,208 | 242.7 | 41.4% |