Yellowstone County, Montana
Yellowstone County is the most populous county in the U.S. state of Montana. As of the 2020 census, the population was 164,731. Its county seat is Billings, 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. The river, in turn, was named for the yellow sandstone cliffs in what is now Yellowstone County. Yellowstone County is included in the Billings, Montana Metropolitan Statistical Area. Geography According to the United States Census Bureau, the county has a total area of , of which is land and (0.6%) is water. Major highways Transit Billings Metropolitan Transit Express Arrow Jefferson Lines Adjacent counties Musselshell County – north Rosebud County – northeast Treasure County – east Big Horn County – southeast Carbon County – southwest Stillwater County – west Golden Valley County – northwest National protected areas Nez Perce National Historical Park (part) Pompeys Pillar National Monument Demographics 2020 census As of the census of 2020 there were 164,731 people. 2010 census As of the census of 2010, there were 147,972 people, 60,672 households, and 38,367 families residing in the county. The population density was . There