| ZIP Codes: | 6 ZIP Codes (6 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Codes: | 605 / 701 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:13:43 PM |
| Population: | 168 [See All] |
| FIPS: | 46091 |
| Land Area: | 906 sq mi |
| Water Area: | 45 sq mi |
| Coordinates: | 45.9859, -97.5459 |
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4,261 residents live across 6 ZIPs covering 906 sq mi, served by 6 distinct USPS-recognized cities.
Population moved from 4,263 to 4,261 from 2014 to 2024 — a 0.0% change. 3 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 57232 (Eden, $93,750 median) and poorest ZIP 57247 (Lake City, $50,455) are 6.1 miles apart — a 1.9× income gap across local geography.
Median home values vary 3.5× across this county — from $81,800 in 57270 (Veblen) to $290,200 in 57232 (Eden).
Educational attainment ranges from 20.2% bachelor's+ in 57247 (Lake City) to 28.5% in 57232 (Eden) — the breadth of educational profiles across the area.
Within South Dakota, this is the #64 most populous of 64 counties and ranks #1 for median household income with the #8 fastest decade growth .
On the national stage, Marshall County is ranks #50 for income .
Weighted by population, the typical household earns about $76,294 across the county — reflecting what a typical resident sees, not a simple ZIP average.
24.4% of adults age 25+ hold a bachelor's degree or higher (703 of 2,881 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.