| ZIP Codes: | 7 ZIP Codes (6 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Code: | 605 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:13:42 PM |
| Population: | 7,643 [See All] |
| FIPS: | 46067 |
| Land Area: | 845 sq mi |
| Water Area: | 1 sq mi |
| Coordinates: | 43.2995, -97.7932 |
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7,643 residents live across 7 ZIPs covering 845 sq mi, served by 7 distinct USPS-recognized cities.
Population moved from 7,234 to 7,557 from 2014 to 2024 — a +4.5% change. 5 ZIPs gained residents, 1 lost.
The county's wealthiest ZIP 57052 (Olivet, $118,750 median) and poorest ZIP 57376 (Tripp, $61,538) are 12.6 miles apart — a 1.9× income gap across local geography.
Median home values vary 3.9× across this county — from $74,400 in 57354 (Kaylor) to $292,500 in 57331 (Dimock).
Density varies 6× across the county — from 3 people/sq mi in 57331 (Dimock) to 20 in 57354 (Kaylor).
Educational attainment ranges from 16.3% bachelor's+ in 57331 (Dimock) to 50.6% in 57052 (Olivet) — the breadth of educational profiles across the area.
Within South Dakota, this is the #25 most populous of 82 counties and ranks #18 for median household income with the #21 fastest decade growth .
Weighted by population, the typical household earns about $77,780 across the county — reflecting what a typical resident sees, not a simple ZIP average.
26.7% of adults age 25+ hold a bachelor's degree or higher (1,350 of 5,059 reporting).
6 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.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 57366 | Parkston | Standard | 2,598 | $78,155 | 222.8 | 7.5% |
| 57029 | Freeman | Standard | 2,155 | $73,750 | 199.1 | 7.8% |
| 57045 | Menno | Standard | 1,151 | $76,042 | 121.7 | 20.0% |
| 57376 | Tripp | Standard | 944 | $61,538 | 155.1 | 0.2% |
| 57052 | Olivet | Standard | 478 | $118,750 | 73.3 | 15.2% |
| 57331 | Dimock | Standard | 231 | $101,406 | 69.4 | -54.0% |
| 57354 | Kaylor | PO Box | 86 | — | 4.2 | — |