| ZIP Codes: | 6 ZIP Codes (6 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Code: | 605 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:13:42 PM |
| Population: | 6,477 [See All] |
| FIPS: | 46057 |
| Land Area: | 628 sq mi |
| Water Area: | 24 sq mi |
| Coordinates: | 44.6646, -97.1903 |
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6,477 residents live across 6 ZIPs covering 628 sq mi, served by 6 distinct USPS-recognized cities.
Population moved from 5,934 to 6,477 from 2014 to 2024 — a +9.2% change. 4 ZIPs gained residents, 2 lost.
The county's wealthiest ZIP 57242 (Hazel, $113,958 median) and poorest ZIP 57221 (Bryant, $73,988) are 12.0 miles apart — a 1.5× income gap across local geography.
Median home values vary 2.4× across this county — from $123,000 in 57241 (Hayti) to $293,200 in 57248 (Lake Norden).
Density varies 4× across the county — from 4 people/sq mi in 57242 (Hazel) to 16 in 57248 (Lake Norden).
Educational attainment ranges from 17.2% bachelor's+ in 57221 (Bryant) to 29.7% in 57234 (Estelline) — the breadth of educational profiles across the area.
Within South Dakota, this is the #27 most populous of 82 counties and ranks #10 for median household income with the #16 fastest decade growth .
Weighted by population, the typical household earns about $87,946 across the county — reflecting what a typical resident sees, not a simple ZIP average.
26.3% of adults age 25+ hold a bachelor's degree or higher (1,004 of 3,818 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 |
|---|---|---|---|---|---|---|
| 57223 | Castlewood | Standard | 1,429 | $92,424 | 126.1 | 7.4% |
| 57234 | Estelline | Standard | 1,339 | $82,358 | 104.8 | -6.4% |
| 57248 | Lake Norden | Standard | 1,295 | $96,364 | 79.6 | 11.2% |
| 57221 | Bryant | Standard | 1,158 | $73,988 | 127.5 | 62.6% |
| 57241 | Hayti | Standard | 936 | $85,833 | 108.0 | -7.8% |
| 57242 | Hazel | Standard | 320 | $113,958 | 82.1 | 13.5% |