| Name | Yellowstone County |
| State | Montana |
| FIPS Code | 30111 |
| County Seat | Billings |
| Timezone | Mountain Daylight Time (MDT) |
| Population (2024) | 170,727 |
| Population Growth Rate(2020-2024) | 3.52% |
| Majority Ethnicity | White 87.72% |
| Public School Majority Ethnicity | White 77% |
| Partisan Voting Index | Republican:+13 |
| Unemployment Rate (May 2026) | 3.7% |
| Sales Tax Rate (2025) | 0% |
| Area Code(s) | 406 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 87.72% |
| African American | 0.89% |
| Hispanic | 6.47% |
| Asian | 0.83% |
| Native American | 4.04% |
| Hawaiin/Pacific Islander | 0.05% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 76.77% |
| African American | 1% |
| Hispanic | 8.06% |
| Asian | 0.57% |
| Native American | 6.63% |
| Hawaiin/Pacific Islander | 0.33% |