Yellowstone County's estimated 2026 population is 173,836 with a growth rate of 0.66% 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 17.14% since that time.
Data after 2023 is projected based on recent change
Overall: 39 years
Female: 40 years
Male: 38.3 years
There are 130,154 adults, (30,892 of whom are seniors) in Yellowstone County.
Female: 85,196 (50.4%)
Male: 83,761 (49.6%)
The racial composition of Yellowstone County includes 85.55% White, 3.95% Native American, and smaller percentages for other race, Asian, Black or African American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 144,550 | 85.55% |
| Two or more races | 12,248 | 7.25% |
| Native American | 6,682 | 3.95% |
| Other race | 2,962 | 1.75% |
| Asian | 1,298 | 0.77% |
| Black or African American | 1,146 | 0.68% |
| Native Hawaiian or Pacific Islander | 71 | 0.04% |
Yellowstone County's average per capita income is $49,616. Household income levels show a median of $76,570. The poverty rate stands at 9.19%.
Name | Median | Mean |
|---|---|---|
| Married Families | $115,288 | $146,459 |
| Families | $99,949 | $128,013 |
| Households | $76,570 | $104,900 |
| Non Families | $46,445 | $64,349 |
Average Income
Median Household Income
Poverty Rate
