Granite County, Montana Demographics 2026

Population Overview

Granite County is located in Montana with a total population of 3,419. It is the 41st most populous county out of 56 in Montana. The county encompasses 4 Census-designated places.

Age Demographics

The median age in Granite County is 53.9 years. This is 34% higher than the state median of 40.2 years. 12.6% 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 Granite County is $54,646. This is 22% lower than the state median of $69,922. It is also 30% lower than the national median of $78,538. The poverty rate stands at 10.4%. This is 13% lower than the state poverty rate of 12.0%. The unemployment rate is 6.5%. This is 72% higher than the state rate of 3.8%. The median home value is $339,500. Housing costs are about the same as the state median of $338,100. The home-value-to-income ratio of 6.2x suggests that housing affordability is a significant concern for many residents. 76.4% of occupied housing units are owner-occupied. This homeownership rate is 10% higher than the state average of 69.4%.

Race & Ethnicity

Granite County has a predominantly White (non-Hispanic) population, comprising 92.5% of all residents. Hispanic or Latino residents account for 1.9%. The Black or African American population is significantly higher than the state average (0.7% vs 0.5%). The Hispanic or Latino population (1.9%) is well below the state average of 4.4%.

Education

31.2% of residents aged 25 and older hold a bachelor's degree or higher. This is 10% 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 93.0%.

Data Sources & Methodology

All figures for Granite County come from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates (2019-2023), 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.