| ZIP Codes: | 3 ZIP Codes (3 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Codes: | 605 / 701 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:13:41 PM |
| Population: | 272 [See All] |
| FIPS: | 46021 |
| CBSA: | Aberdeen, SD |
| Land Area: | 482 sq mi |
| Water Area: | 8 sq mi |
| Coordinates: | 45.6972, -100.0556 |
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1,494 residents live across 3 ZIPs covering 482 sq mi, served by 3 distinct USPS-recognized cities.
Population moved from 1,230 to 1,494 from 2014 to 2024 — a +21.5% change. 3 ZIPs gained residents, 0 lost.
The county's wealthiest ZIP 57646 (Mound City, $101,406 median) and poorest ZIP 57648 (Pollock, $61,354) are 14.7 miles apart — a 1.7× income gap across local geography.
Median home values vary 1.1× across this county — from $99,200 in 57648 (Pollock) to $113,300 in 57646 (Mound City).
Density varies 2× across the county — from 2 people/sq mi in 57646 (Mound City) to 4 in 57632 (Herreid).
Educational attainment ranges from 33.7% bachelor's+ in 57648 (Pollock) to 47.0% in 57646 (Mound City) — the breadth of educational profiles across the area.
Within South Dakota, this is the #81 most populous of 82 counties and ranks #3 for median household income .
Weighted by population, the typical household earns about $78,965 across the county — reflecting what a typical resident sees, not a simple ZIP average.
37.4% of adults age 25+ hold a bachelor's degree or higher (419 of 1,120 reporting).
3 Standard delivery, 0 PO Box only, 0 single-entity Unique ZIPs serve this county.