Yellowstone County, Montana Demographics 2026

Population Overview

Yellowstone County is located in Montana with a total population of 167,340. It is the 1st most populous county out of 56 in Montana.

Age Demographics

The median age in Yellowstone County is 38.7 years. This is 4% lower than the state median of 40.2 years.

Economy, Income & Housing

The median household income in Yellowstone County is $74,400. This is 6% higher than the state median of $69,922. Compared to the national median of $78,538, household income here is 5% lower. The poverty rate stands at 10.2%. This is 15% lower than the state poverty rate of 12.0%. The unemployment rate is 3.4%. This is 9% lower than the state rate of 3.8%. The median home value is $317,600. Housing costs are 6% lower than the state median of $338,100. The home-value-to-income ratio is 4.3x. 69.3% of occupied housing units are owner-occupied.

Race & Ethnicity

The largest racial or ethnic group in Yellowstone County is White (non-Hispanic), making up 83.9% of the population. Hispanic or Latino residents account for 6.4%.

Education

33.9% of residents aged 25 and older hold a bachelor's degree or higher. This is 2% 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 95.3%.