Jefferson County's estimated 2025 population is 13,482 with a growth rate of 1.64% in the past year according to the most recent United States census data. Jefferson County is the 15th largest county in Montana. The 2010 population was 11,406 and has seen a growth of 18.2% since that time.
Data after 2023 is projected based on recent change
The racial composition of Jefferson County includes 92.81% White, and smaller percentages for Native American, other race, Asian, Black or African American, Native Hawaiian or Pacific Islander and multiracial populations.
White
Two or more races
Native American
Other race
Asian
Black or African American
Native Hawaiian or Pacific Islander
Race | Population | Percentage (of total) |
|---|---|---|
| White | 11,602 | 92.81% |
| Two or more races | 596 | 4.77% |
| Native American | 165 | 1.32% |
| Other race | 73 | 0.58% |
| Asian | 51 | 0.41% |
| Black or African American | 14 | 0.11% |
| Native Hawaiian or Pacific Islander | 0 | 0% |
Married
Widowed
Divorced
Separated
Never Married
Jefferson County's average per capita income is $44,682. Household income levels show a median of $76,576. The poverty rate stands at 6.29%.
Name | Median | Mean |
|---|---|---|
| Married Families | $105,382 | - |
| Families | $97,578 | $123,542 |
| Households | $76,576 | $107,580 |
| Non Families | $46,147 | $58,288 |
Average Income
Median Household Income
Poverty Rate
