Granite County's 2026 population is estimated at 3,676, reflecting a 1.02% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Granite County is the 40th largest county in Montana. The 2010 population was 3,073 and has grown 19.62% since 2010.
Data after 2023 is projected based on recent change
Overall: 53 years
Female: 51.7 years
Male: 54.8 years
There are 2,953 adults, (1,082 of whom are seniors) in Granite County.
Female: 1,707 (49.3%)
Male: 1,755 (50.7%)
The racial composition of Granite County includes 90.53% White, and smaller percentages for Native American, Asian, other race, Black or African American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 3,134 | 90.53% |
| Two or more races | 205 | 5.92% |
| Native American | 63 | 1.82% |
| Asian | 32 | 0.92% |
| Other race | 17 | 0.49% |
| Black or African American | 9 | 0.26% |
| Native Hawaiian or Pacific Islander | 2 | 0.06% |
Granite County 's average per capita income is $40,000. Household income levels show a median of $59,265. The poverty rate stands at 10.17%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $77,305 | - |
| Families | $76,650 | $100,557 |
| Households | $59,265 | $83,119 |
| Non Families | $35,543 | $46,944 |
Average Income
Median Household Income
Poverty Rate