Stillwater County's estimated 2026 population is 9,876 with a growth rate of 2.2% 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 8.38% since that time.
Data after 2023 is projected based on recent change
The racial composition of Stillwater County includes 93.28% White, and smaller percentages for other race, Asian, Native American, Black or African American and multiracial populations.
White (93.28%)
Two or more races (4.78%)
Other race (1.12%)
Asian (0.36%)
Native American (0.35%)
Black or African American (0.1%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 8,444 | 93.28% |
| Two or more races | 433 | 4.78% |
| Other race | 101 | 1.12% |
| Asian | 33 | 0.36% |
| Native American | 32 | 0.35% |
| Black or African American | 9 | 0.1% |
Married
Widowed
Divorced
Separated
Never Married
Stillwater County's average per capita income is $50,430. Household income levels show a median of $81,503. The poverty rate stands at 8.25%.
Name | Median | Mean |
|---|---|---|
| Married Families | $107,557 | - |
| Families | $101,688 | $130,282 |
| Households | $81,503 | $111,489 |
| Non Families | $43,409 | $72,182 |
Average Income
Median Household Income
Poverty Rate
