Yellowstone County | |
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![]() Yellowstone County Courthouse in Billings, 2024 | |
![]() Location within the U.S. state of Montana | |
![]() Montana's location within the U.S. | |
Coordinates: 45°56′N 108°16′W / 45.94°N 108.27°W | |
Country | ![]() |
State | ![]() |
Founded | February 26, 1883 |
Named for | Yellowstone River |
Seat | Billings |
Largest city | Billings |
Area | |
• Total | 2,649 sq mi (6,860 km2) |
• Land | 2,633 sq mi (6,820 km2) |
• Water | 16 sq mi (40 km2) 0.6% |
Population (2020) | |
• Total | 164,731 |
• Estimate (2022) | 169,852 ![]() |
• Density | 62/sq mi (24/km2) |
Time zone | UTC−7 (Mountain) |
• Summer (DST) | UTC−6 (MDT) |
Congressional district | 2nd |
Website | www |
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Yellowstone County is the most populous county in the U.S. state of Montana. As of the 2020 census, the population was 164,731.[1] Its county seat is Billings,[2] the state's most populous city. Like the nearby park, Yellowstone County is named after the Yellowstone River which roughly bisects the county, flowing southwest to northeast.[3] The river, in turn, was named for the yellow sandstone cliffs in what is now Yellowstone County.[4]
Yellowstone County is included in the Billings, Montana Metropolitan Statistical Area.