ZIP Code 57551

ZIP code 57551 is classified by USPS as a standard delivery area and covers roughly 1899.2 square miles in Martin, Bennett County, South Dakota. The area is home to 2,279 residents, producing a population density of 1 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 57551 against South Dakota and the nation.

On the economic side, the median household income for ZIP 57551 sits at $70,096 (8% below the South Dakota average), while per-capita income is $25,744. The poverty rate stands at 20.5% and the unemployment rate at 7.1%. On housing, the median home value is $161,900 (16% below the state average) with median rent at $613 per month, and 64.9% of occupied units are owner-occupied — a direct signal of whether 57551 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 25.6% of adults hold a bachelor's degree or higher, the median age is 36, and the average commute is —. Use the benchmarks above to see where 57551 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 →