| ZIP Codes: | 5 ZIP Codes (4 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Code: | 605 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:55:04 PM |
| Population: | 5,347 [See All] |
| FIPS: | 46129 |
| Land Area: | 822 sq mi |
| Water Area: | 90 sq mi |
| Coordinates: | 45.4649, -100.1463 |
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5,347 residents live across 5 ZIPs covering 822 sq mi, served by 5 distinct USPS-recognized cities.
Population moved from 5,665 to 5,347 from 2014 to 2024 — a -5.6% change. 3 ZIPs gained residents, 2 lost.
The county's wealthiest ZIP 57601 (Mobridge, $66,003 median) and poorest ZIP 57420 (Akaska, $40,469) are 18.2 miles apart — a 1.6× income gap across local geography.
Median home values vary 2.1× across this county — from $79,000 in 57420 (Akaska) to $162,500 in 57631 (Glenham).
Density varies 37× across the county — from 1 people/sq mi in 57452 (Java) to 23 in 57601 (Mobridge).
Educational attainment ranges from 13.3% bachelor's+ in 57452 (Java) to 36.9% in 57420 (Akaska) — the breadth of educational profiles across the area.
Within South Dakota, this is the #37 most populous of 82 counties and ranks #76 for median household income .
Weighted by population, the typical household earns about $62,885 across the county — reflecting what a typical resident sees, not a simple ZIP average.
28.8% of adults age 25+ hold a bachelor's degree or higher (1,113 of 3,868 reporting).
4 Standard delivery, 1 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.
Walworth County lost 5.6% of residents between 2014 and 2024. ZIPs that shed the largest share: