ZIP Code 59231 — St. Marie CDP, MT Demographics & Data

ZIP code 59231 covers St. Marie, MT in Valley County with a population of about 319.

At a glance, the area shows median age of 39.3 (near the U.S. median).

It sits in telephone area code 406; U.S. House district MT-2; the GREAT FALLS media market.

Median household income in ZIP 59231 is about $38,125 — about 49% below the U.S. median ($75,149).

On socioeconomic markers, US5 shows a poverty rate of 27.9%; unemployment rate near 17.4%; 21.8% of adults with a bachelor’s degree or higher (about 11.9 points below the national share (33.7%)).

Labor and commute patterns include leading industry context around Retail trade, Healthcare, and Information; a mean commute of about 56.0 minutes (U.S. average near 26.8).

Housing tenure and rents show owner-occupancy near 91.7% (about 26.3 points above the national owner-occupancy rate (65.4%)).

FEMA’s National Risk Index rates natural-hazard risk for St. Marie CDP, MT as Very Low (composite score 35.9), which is relatively lower than many U.S. communities. The strongest component scores on US5 are wildfire (49.5) and flood (34.2). These scores are county-linked NRI values published for planning context — all ZIP codes in the same county share the same composite score on US5. Useful when comparing insurance and disaster exposure across areas, not a substitute for a parcel-level flood or fire determination.

Climate normals for St. Marie CDP, MT show little to no average snow and around 11.8 inches of annual precipitation.

IRS migration statistics show a net inflow of about 17 for ZIP 59231 (St. Marie CDP, MT) on US5’s published series — a signal of people/tax filers moving in relative to those leaving. Inflows often track job growth, housing demand, or lifestyle migration; treat the figure as a directional indicator rather than a precise headcount.