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Yellowstone County is a county located in the State of Montana. Based on the 2010 census, the population was 147,972, and a 2014 estimate put
the population at 155,634. It is the most populous county in Montana. Its county seat is Billings. Yellowstone County is named for the
Yellowstone River which roughly bisects the county from southwest to northeast. The river in turn was named after the yellow Sandstone cliffs
in what is now Yellowstone County.
Yellowstone County is included in the Billings, MT Metropolitan Statistical Area.
According to the Montana Almanac, by authors Andrea Merrill and Judy Jacobson. The Yellowstone River, the authors say, was called by early French trappers, Roche Jaune for "yellow rock."
County QuickFacts: CensusBureau Quick Facts
Yellowstone County was created 26 February 1883 from Gallatin, Meagher, Custer, and Carbon Counties. County seat: Billings
As reported by the Census Bureau, the county has a total area of 2,649 square miles (6,861 km2), of which,
2,635 square miles (6,825 km2) of it is land and 14 square miles (36 km2) of it (0.52%) is water.
Bordering counties are as follows: