St. Marie CDP, Montana Demographics & Population 2026

Population Overview

St. Marie CDP is a small community located in Montana. The total population is 319. It ranks as the 195th most populous out of 470 cities and towns in Montana.

Age Demographics

The median age in St. Marie CDP is 39.3 years. This is 2% lower than the state median of 40.2 years. Only 3.1% of residents are under 18, indicating fewer families with children. 28.5% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The median household income in St. Marie CDP is $38,125. This is 45% lower than the state median of $69,922. Compared to the national median of $78,538, household income here is 51% lower. The poverty rate stands at 27.9%. This is 132% higher than the state poverty rate of 12.0%. With more than one in five residents living below the poverty line, economic hardship is a significant challenge for the community. The unemployment rate is 17.4%. This is 364% higher than the state rate of 3.8%. 91.7% of occupied housing units are owner-occupied. This homeownership rate is 32% higher than the state average of 69.4%.

Race & Ethnicity

The largest racial or ethnic group in St. Marie CDP is White (non-Hispanic), making up 55.8% of the population.

Education

21.8% of residents aged 25 and older hold a bachelor's degree or higher. This is 37% lower than the state rate of 34.5%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 65.1%.

Data Sources & Methodology

All demographic data for St. Marie CDP, Montana is sourced from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates (2019-2023). The ACS collects data from approximately 3.5 million households annually, providing reliable estimates for communities of all sizes. Comparisons are made against Montana state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 470 Census-designated places in Montana. For official data, visit data.census.gov.