| Name | Yellowstone County |
| State | Montana |
| FIPS Code | 30111 |
| County Seat | Billings |
| Timezone | Mountain Standard Time (MST) |
| Population (2022) | 148,191 |
| Population Growth Rate(2000-2022) | 11.33% |
| Majority Ethnicity | White 93.84% |
| Public School Majority Ethnicity | White 77% |
| Partisan Voting Index | Republican:+10 |
| Unemployment Rate (January 2025) | 2.5% |
| Area Code(s) | 406 |
| Race/Ethnicity | Percentage of Population (2022) |
|---|---|
| White | 93.84% |
| African American | 0.89% |
| Hispanic | 4.14% |
| Asian | 0.83% |
| Native American | 0.15% |
| Hawaiin/Pacific Islander | 0.15% |
| 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% |