Yellowstone County, Montana
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Postcard. Pompeys Pillar National Monument.
Location within the U.S. state of Montana
Montana's location within the U.S.
|Named for||Yellowstone River|
|• Total||2,649 sq mi (6,860 km2)|
|• Land||2,633 sq mi (6,820 km2)|
|• Water||16 sq mi (40 km2) 0.6%%|
| • Estimate |
|• Density||60.4/sq mi (23.3/km2)|
|Time zone||UTC−7 (Mountain)|
|• Summer (DST)||UTC−6 (MDT)|
Yellowstone County is the most populous county in the U.S. state of Montana. As of the 2010 United States Census, 147,972 people lived there, and a 2017 estimate put the population at 158,980. Its county seat is Billings.