| ZIP Codes: | 10 ZIP Codes (9 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Code: | 605 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:55:03 PM |
| Population: | 6,010 [See All] |
| FIPS: | 46115 |
| Land Area: | 1,623 sq mi |
| Water Area: | 9 sq mi |
| Coordinates: | 44.9955, -98.3925 |
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6,010 residents live across 10 ZIPs covering 1,623 sq mi, served by 10 distinct USPS-recognized cities.
Population moved from 6,680 to 6,010 from 2014 to 2024 — a -10.0% change. 4 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 57465 (Northville, $120,250 median) and poorest ZIP 57440 (Frankfort, $54,625) are 28.3 miles apart — a 2.2× income gap across local geography.
Median home values vary 3.8× across this county — from $53,000 in 57477 (Turton) to $200,700 in 57461 (Mellette).
Density varies 8× across the county — from 1 people/sq mi in 57477 (Turton) to 9 in 57469 (Redfield).
Educational attainment ranges from 16.4% bachelor's+ in 57436 (Doland) to 52.3% in 57477 (Turton) — the breadth of educational profiles across the area.
Within South Dakota, this is the #30 most populous of 82 counties and ranks #28 for median household income .
Weighted by population, the typical household earns about $73,516 across the county — reflecting what a typical resident sees, not a simple ZIP average.
28.0% of adults age 25+ hold a bachelor's degree or higher (1,256 of 4,478 reporting).
9 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.
Spink County lost 10.0% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 57469 | Redfield | Standard | 2,866 | $66,111 | 305.7 | -17.6% |
| 57434 | Conde | Standard | 506 | $73,393 | 288.6 | -5.8% |
| 57440 | Frankfort | Standard | 466 | $54,625 | 152.8 | -11.4% |
| 57436 | Doland | Standard | 440 | $73,333 | 194.3 | 10.8% |
| 57465 | Northville | Standard | 438 | $120,250 | 152.3 | 16.8% |
| 57424 | Ashton | Standard | 437 | $75,000 | 152.3 | 33.6% |
| 57476 | Tulare | Standard | 349 | $76,750 | 149.2 | -20.9% |
| 57461 | Mellette | Standard | 299 | $105,536 | 105.9 | -24.3% |
| 57477 | Turton | Standard | 117 | $59,375 | 102.4 | 7.3% |
| 57429 | Brentford | PO Box | 92 | — | 19.1 | -2.1% |