| ZIP Codes: | 4 ZIP Codes (4 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Code: | 605 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:13:42 PM |
| Population: | 4,002 [See All] |
| FIPS: | 46045 |
| CBSA: | Aberdeen, SD |
| Land Area: | 1,144 sq mi |
| Water Area: | 22 sq mi |
| Coordinates: | 45.4720, -99.3018 |
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4,002 residents live across 4 ZIPs covering 1,144 sq mi, served by 4 distinct USPS-recognized cities.
Population moved from 3,996 to 4,002 from 2014 to 2024 — a +0.2% change. 2 ZIPs gained residents, 2 lost.
The county's wealthiest ZIP 57451 (Ipswich, $86,000 median) and poorest ZIP 57428 (Bowdle, $64,375) are 36.6 miles apart — a 1.3× income gap across local geography.
Median home values vary 3.0× across this county — from $64,300 in 57448 (Hosmer) to $195,700 in 57451 (Ipswich).
Density varies 4× across the county — from 1 people/sq mi in 57471 (Roscoe) to 6 in 57451 (Ipswich).
Educational attainment ranges from 20.9% bachelor's+ in 57471 (Roscoe) to 32.6% in 57448 (Hosmer) — the breadth of educational profiles across the area.
Within South Dakota, this is the #41 most populous of 82 counties and ranks #53 for median household income .
Weighted by population, the typical household earns about $78,448 across the county — reflecting what a typical resident sees, not a simple ZIP average.
29.1% of adults age 25+ hold a bachelor's degree or higher (830 of 2,854 reporting).
4 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.