ZIP Code 57231

ZIP code 57231 is classified by USPS as a standard delivery area and covers roughly 706.3 square miles in De Smet, Kingsbury County, South Dakota. The area is home to 1,695 residents, producing a population density of 2 people per square mile, and falls within the Chicago time zone. These USPS and Census boundary values drive every downstream statistic on this page, including the benchmarks that compare 57231 against South Dakota and the nation.

On the economic side, the median household income for ZIP 57231 sits at $78,646 (3% above the South Dakota average), while per-capita income is $41,058. The poverty rate stands at 8.8% and the unemployment rate at 0.0%. On housing, the median home value is $212,200 (11% above the state average) with median rent at $725 per month, and 86.7% of occupied units are owner-occupied — a direct signal of whether 57231 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 24.8% of adults hold a bachelor's degree or higher, the median age is 44.2, and the average commute is —. Use the benchmarks above to see where 57231 sits relative to South Dakota and the national baseline rather than viewing the numbers in isolation. Every figure is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates, HUD Fair Market Rents, and FHFA Home Price Index data — no estimates, no proprietary scoring. Verify with HUD →