Yellowstone County is in south-central Montana, with Billings as the county seat. Billings is also Montana's largest city. The 2020 population was 164,731, the highest in the state, across 2,649 square miles. The Yellowstone River cuts through the county from southwest to northeast. The river got its name from the yellow sandstone cliffs along its banks here, and that name eventually traveled upstream to the national park 120 miles to the west. The Rimrocks, a long sandstone escarpment, run along the north edge of Billings. Just south of the city, Pictograph Cave has rock art dating back over 2,000 years. The annual MontanaFair in August is the state's largest event.
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Yellowstone County administration contact details
| County seat | Billings |
|---|---|
| Phone number | (406) 256-2701 |
| Official website | https://www.yellowstonecountymt.gov |
| County clerk | Jeff Martin |
| County auditor | Marie Boucher |
| County permits office or building department contact details | (406) 256-2833 |
| County commissioner | Denise Jourdonnais |
Yellowstone County Sheriff's Office and Jail Information
| Number of prisons | 1 |
|---|---|
| Jail names | Yellowstone County Detention Facility |
| Sheriff office address | 2550 3rd Ave North, Billings, MT 59101 |
| Sheriff office phone number | 406-256-2929 |
| Inmate search information | To locate an inmate in Yellowstone County, please visit the detention facility's website or contact the Sheriff's Office directly for assistance. |
| Clerk of Court name | Kristie Lee Boelter |
| Clerk of Court address | 217 N 27th St, Room 414, Billings, MT 59101 |
Yellowstone County Statistics
| Number of cities/towns/villages | 10 |
|---|---|
| Population | 167000 |
| Area | 2635 sq mi |
| Density | 63 /sq mi |
| Altitude | 3600 ft |
| GDP | $9 billion |
| Median Household Income | $62000 |
| Poverty rate | 10% |
| Unemployment rate | 3% |
| Educational Attainment | 32% Bachelor's Degree or higher |
| Crime rate | 400 per 100,000 people |
Environmental risk in Yellowstone County, MT
| Overall risk | Relatively Low |
|---|---|
| Expected Annual Loss | Relatively Low |
| Social Vulnerability | Relatively Low |
| Community Resilience | Very High |
| Avalanche Risk | Not Applicable |
| Coastal Flooding Risk | Not Applicable |
| Cold Wave Risk | Relatively Moderate |
| Drought Risk | Relatively Low |
| Earthquake Risk | Very Low |
List of cities and towns in Montana County by population size
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