Yellowstone County's estimated 2026 population is 173,295 with a growth rate of 0.5% in the past year according to the most recent United States census data. Yellowstone County is the largest county in Montana. The 2010 population was 148,405 and has seen a growth of 16.77% since that time.
Data after 2023 is projected based on recent change
The racial composition of Yellowstone County includes 86.77% White, 4% Native American, and smaller percentages for other race, Black or African American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
White (86.77%)
Two or more races (5.84%)
Native American (4%)
Other race (1.64%)
Black or African American (0.88%)
Asian (0.82%)
Native Hawaiian or Pacific Islander (0.05%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 145,204 | 86.77% |
| Two or more races | 9,781 | 5.84% |
| Native American | 6,694 | 4% |
| Other race | 2,739 | 1.64% |
| Black or African American | 1,466 | 0.88% |
| Asian | 1,380 | 0.82% |
| Native Hawaiian or Pacific Islander | 76 | 0.05% |
Married
Widowed
Divorced
Separated
Never Married
Yellowstone County's average per capita income is $47,924. Household income levels show a median of $74,400. The poverty rate stands at 10.23%.
Name | Median | Mean |
|---|---|---|
| Married Families | $109,602 | $142,312 |
| Families | $94,167 | $123,455 |
| Households | $74,400 | $102,308 |
| Non Families | $45,452 | $63,281 |
Average Income
Median Household Income
Poverty Rate
