ZIP Code 57631

ZIP code 57631 is classified by USPS as a standard delivery area and covers roughly 401.1 square miles in Glenham, Walworth County, South Dakota. The area is home to 361 residents, producing a population density of 1 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 57631 against South Dakota and the nation.

On the economic side, the median household income for ZIP 57631 sits at $56,827 (26% below the South Dakota average), while per-capita income is $52,384. The poverty rate stands at 0.5% and the unemployment rate at 21.6%. On housing, the median home value is $162,500 (15% below the state average) with median rent at — per month, and 90.3% of occupied units are owner-occupied — a direct signal of whether 57631 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 21.6% of adults hold a bachelor's degree or higher, the median age is 60.7, and the average commute is —. Use the benchmarks above to see where 57631 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 →