Yellowstone County is the most populous county in the U.S. state of Montana. As of the 2010 United States Census, the population was 147,972, and a 2019 estimate put the population at 161,300. Its county seat is Billings. Yellowstone County is named for the Yellowstone River which roughly bisects the county, flowing southwest to northeast. The river in turn was named after the yellow Sandstone cliffs in what is now Yellowstone County.
According to the US Census Bureau, the county has a total area of 2,649 square miles , of which 2,633 square miles is land and 16 square miles is water.
Source: Wikipedia.org
Copyright: Creative Commons 3.0
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