ZIP Code 57751

ZIP code 57751 is classified by USPS as a standard delivery area and covers roughly 175.8 square miles in Keystone, Pennington County, South Dakota. The area is home to 844 residents, producing a population density of 5 people per square mile, and falls within the Denver time zone. These USPS and Census boundary values drive every downstream statistic on this page, including the benchmarks that compare 57751 against South Dakota and the nation.

On the economic side, the median household income for ZIP 57751 sits at $97,969 (28% above the South Dakota average), while per-capita income is $43,414. The poverty rate stands at 4.6% and the unemployment rate at 2.9%. On housing, the median home value is $473,500 (147% above the state average) with median rent at $600 per month, and 85.6% of occupied units are owner-occupied — a direct signal of whether 57751 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 43.0% of adults hold a bachelor's degree or higher, the median age is 54.2, and the average commute is —. Use the benchmarks above to see where 57751 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.