St. Regis, Montana Demographics & Population 2026

A note before these figures: with a population of 406, St. Regis's ACS estimates come from a small number of survey responses and carry wide margins of error. Individual percentages below — particularly rates that round to 0% or 100% — are approximations, not precise measurements. See data.census.gov for the published margins of error.

Population Overview

St. Regis is a small community located in Montana, within Mineral County. The total population is 406. It ranks as the 170th most populous out of 475 Census-designated places in Montana.

Age Demographics

The median age in St. Regis is 36.5 years. This is 10% lower than the state median of 40.4 years. With 35.0% of the population under 18, St. Regis has a notably young demographic profile, suggesting a family-oriented community.

Economy, Income & Housing

The median household income in St. Regis is $61,000. This is 16% lower than the state median of $72,509. It is also 24% lower than the national median of $80,734. The poverty rate stands at 16.0%. This is 39% higher than the state poverty rate of 11.5%. The unemployment rate is 2.5%. This is 31% lower than the state rate of 3.6%. The median home value is $208,600. Housing costs are 44% lower than the state median of $375,800. The home-value-to-income ratio is 3.4x. 72.4% of occupied housing units are owner-occupied. This homeownership rate is 5% higher than the state average of 69.2%.

Race & Ethnicity

The largest racial or ethnic group in St. Regis is White (non-Hispanic), making up 83.5% of the population. Hispanic or Latino residents account for 3.5%.

Education

11.7% of residents aged 25 and older hold a bachelor's degree or higher. This is 67% lower than the state rate of 35.2%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 90.0%.

Data Sources & Methodology

All demographic data for St. Regis, Montana is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Montana state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 475 Census-designated places in Montana. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.