Stillwater County's estimated 2026 population is 9,461 with a growth rate of 0.17% in the past year according to the most recent United States census data. Stillwater County is the 25th largest county in Montana. The 2010 population was 9,112 and has seen a growth of 3.83% since that time.
Data after 2023 is projected based on recent change
Overall: 46.7 years
Female: 46.8 years
Male: 46.6 years
There are 7,257 adults, (2,314 of whom are seniors) in Stillwater County.
Female: 4,542 (49.5%)
Male: 4,640 (50.5%)
The racial composition of Stillwater County includes 93.04% White, and smaller percentages for other race, Asian, Native American, Black or African American and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 8,543 | 93.04% |
| Two or more races | 508 | 5.53% |
| Other race | 68 | 0.74% |
| Asian | 34 | 0.37% |
| Native American | 25 | 0.27% |
| Black or African American | 4 | 0.04% |
Stillwater County's average per capita income is $49,848. Household income levels show a median of $84,732. The poverty rate stands at 8.27%.
Name | Median | Mean |
|---|---|---|
| Married Families | $113,156 | - |
| Families | $106,458 | $138,133 |
| Households | $84,732 | $116,762 |
| Non Families | $39,710 | $70,767 |
Average Income
Median Household Income
Poverty Rate
