Gallatin County, Montana Demographics 2026

Population Overview

Gallatin County is located in Montana with a total population of 122,194. It is the 2nd most populous county out of 56 in Montana.

Age Demographics

The median age in Gallatin County is 33.8 years. This is 16% lower than the state median of 40.2 years.

Economy, Income & Housing

The median household income in Gallatin County is $87,454. This is 25% higher than the state median of $69,922. Compared to the national median of $78,538, household income here is 11% higher. The poverty rate stands at 10.2%. This is 15% lower than the state poverty rate of 12.0%. The unemployment rate is 2.3%. This is 38% lower than the state rate of 3.8%. The median home value is $604,900. Housing costs are 79% higher than the state median of $338,100. The home-value-to-income ratio of 6.9x suggests that housing affordability is a significant concern for many residents. 61.5% of occupied housing units are owner-occupied. This homeownership rate is 11% lower than the state average of 69.4%.

Race & Ethnicity

Gallatin County has a predominantly White (non-Hispanic) population, comprising 88.3% of all residents. Hispanic or Latino residents account for 5.1%. The Asian population is significantly higher than the state average (1.3% vs 0.8%).

Education

53.1% of residents aged 25 and older hold a bachelor's degree or higher. This places Gallatin County in the top 10% of all cities in the state for educational attainment. This is 54% higher 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 97.2%. Notably, 19.9% of adults hold a graduate or professional degree, indicating a highly educated workforce.