| ZIP Codes: | 8 ZIP Codes (8 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Code: | 605 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:14:55 PM |
| Population: | 7,883 [See All] |
| FIPS: | 46051 |
| Land Area: | 643 sq mi |
| Water Area: | 12 sq mi |
| Coordinates: | 45.1474, -96.7070 |
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7,883 residents live across 8 ZIPs covering 643 sq mi, served by 8 distinct USPS-recognized cities.
Population moved from 7,475 to 7,883 from 2014 to 2024 — a +5.5% change. 4 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 57269 (Twin Brooks, $98,333 median) and poorest ZIP 57265 (Strandburg, $69,519) are 17.1 miles apart — a 1.4× income gap across local geography.
Median home values vary 5.5× across this county — from $75,000 in 57251 (Marvin) to $410,600 in 57269 (Twin Brooks).
Density varies 14× across the county — from 2 people/sq mi in 57269 (Twin Brooks) to 30 in 57252 (Milbank).
Educational attainment ranges from 1.1% bachelor's+ in 57265 (Strandburg) to 54.7% in 57269 (Twin Brooks) — the breadth of educational profiles across the area.
Within South Dakota, this is the #24 most populous of 77 counties and ranks #23 for median household income with the #20 fastest decade growth .
Weighted by population, the typical household earns about $75,578 across the county — reflecting what a typical resident sees, not a simple ZIP average.
25.8% of adults age 25+ hold a bachelor's degree or higher (1,447 of 5,600 reporting).
8 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.
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 |
|---|---|---|---|---|---|---|
| 57252 | Milbank | Standard | 4,883 | $70,479 | 164.7 | 7.9% |
| 57216 | Big Stone City | Standard | 1,584 | $88,203 | 59.5 | 40.2% |
| 57259 | Revillo | Standard | 477 | $80,250 | 121.3 | 2.1% |
| 57251 | Marvin | Standard | 228 | $72,292 | 43.1 | 10.7% |
| 57265 | Strandburg | Standard | 202 | $69,519 | 76.8 | -15.5% |
| 57264 | Stockholm | Standard | 191 | $79,583 | 50.4 | -1.5% |
| 57269 | Twin Brooks | Standard | 186 | $98,333 | 88.4 | -66.7% |
| 57246 | Labolt | Standard | 132 | $72,917 | 39.1 | -14.3% |