| ZIP Codes: | 3 ZIP Codes (3 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Code: | 605 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 11:55:00 PM |
| Population: | 3,301 [See All] |
| FIPS: | 46007 |
| Land Area: | 1,144 sq mi |
| Water Area: | 6 sq mi |
| Coordinates: | 43.2319, -101.6334 |
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3,301 residents live across 3 ZIPs covering 1,144 sq mi, served by 3 distinct USPS-recognized cities.
Population moved from 3,189 to 3,301 from 2014 to 2024 — a +3.5% change. 2 ZIPs gained residents, 1 lost.
The county's wealthiest ZIP 57551 (Martin, $70,096 median) and poorest ZIP 57574 (Tuthill, $2,499) are 8.2 miles apart — a 28.0× income gap across local geography.
Median home values vary 2.3× across this county — from $111,600 in 57714 (Allen) to $261,900 in 57574 (Tuthill).
Density varies 23× across the county — from 1 people/sq mi in 57574 (Tuthill) to 18 in 57714 (Allen).
Educational attainment ranges from 16.4% bachelor's+ in 57574 (Tuthill) to 25.6% in 57551 (Martin) — the breadth of educational profiles across the area.
Within South Dakota, this is the #43 most populous of 82 counties and ranks #82 for median household income .
Weighted by population, the typical household earns about $67,808 across the county — reflecting what a typical resident sees, not a simple ZIP average.
18.8% of adults age 25+ hold a bachelor's degree or higher (317 of 1,690 reporting).
3 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.