ZIP Code 59231

ZIP code 59231 is classified by USPS as a standard delivery area and covers roughly 5.2 square miles in Saint Marie, Valley County, Montana. The area is home to 264 residents, producing a population density of 51 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 59231 against Montana and the nation.

On the economic side, the median household income for ZIP 59231 sits at $38,971 (44% below the Montana average), while per-capita income is $16,911. The poverty rate stands at 23.9% and the unemployment rate at 18.9%. On housing, the median home value is $18,800 (94% below the state average) with median rent at — per month, and 89.1% of occupied units are owner-occupied, a direct signal of whether 59231 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 23.1% of adults hold a bachelor's degree or higher, the median age is 37.9, and the average commute is —. Use the benchmarks above to see where 59231 sits relative to Montana 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 →