ZIP Code 57239

ZIP code 57239 is classified by USPS as a standard delivery area and covers roughly 117.4 square miles in Grenville, Day County, South Dakota. The area is home to 223 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 57239 against South Dakota and the nation.

On the economic side, the median household income for ZIP 57239 sits at $106,389 (39% above the South Dakota average), while per-capita income is $58,270. The poverty rate stands at 5.3% and the unemployment rate at 0.0%. On housing, the median home value is $377,300 (97% above the state average) with median rent at — per month, and 88.7% of occupied units are owner-occupied — a direct signal of whether 57239 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 34.9% of adults hold a bachelor's degree or higher, the median age is 63.2, and the average commute is —. We also surface 1 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Day County, so you can benchmark 57239 against its immediate geography rather than a national average alone. 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.