Stillwater County, Montana Demographics 2026

Population Overview

Stillwater County is located in Montana with a total population of 9,182. It is the 25th most populous county out of 56 in Montana. The county encompasses 7 Census-designated places.

Age Demographics

The median age in Stillwater County is 46.7 years. This is 16% higher than the state median of 40.4 years.

Economy, Income & Housing

The median household income in Stillwater County is $84,732. This is 17% higher than the state median of $72,509. It is also 5% higher than the national median of $80,734. The poverty rate stands at 8.3%. This is 28% lower than the state poverty rate of 11.5%. The unemployment rate is 3.1%. This is 15% lower than the state rate of 3.6%. The median home value is $405,800. Housing costs are 8% higher than the state median of $375,800. The home-value-to-income ratio is 4.8x. 82.9% of occupied housing units are owner-occupied. This homeownership rate is 20% higher than the state average of 69.2%.

Race & Ethnicity

Stillwater County has a predominantly White (non-Hispanic) population, comprising 92.0% of all residents. Hispanic or Latino residents account for 3.5%. The Black or African American population (0.0%) is well below the state average of 0.4%. The Asian population (0.4%) is well below the state average of 0.8%.

Education

32.3% of residents aged 25 and older hold a bachelor's degree or higher. This is 8% 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 95.6%.

Data Sources & Methodology

All figures for Stillwater County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against Montana and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.