ZIP Code 57042

ZIP code 57042 is classified by USPS as a standard delivery area and covers roughly 532.6 square miles in Madison, Lake County, South Dakota. The area is home to 8,415 residents, producing a population density of 16 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 57042 against South Dakota and the nation.

On the economic side, the median household income for ZIP 57042 sits at $71,868 (6% below the South Dakota average), while per-capita income is $39,812. The poverty rate stands at 8.1% and the unemployment rate at 3.8%. On housing, the median home value is $228,200 (19% above the state average) with median rent at $963 per month, and 67.4% of occupied units are owner-occupied — a direct signal of whether 57042 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 36.6% of adults hold a bachelor's degree or higher, the median age is 43.1, and the average commute is 13 minutes. We also surface 1 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Lake County, so you can benchmark 57042 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.