Yellowstone County, Montana

Yellowstone County
Yellowstone County
County
	Yellowstone County Courthouse in Billings, 2024
	Seal
	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	United States
State	Montana
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.co.yellowstone.mt.gov
	Montana county number 03;

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.

^ "State & County QuickFacts". United States Census Bureau. Archived from the original on August 25, 2023. Retrieved April 5, 2023.
^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
^ "Montana Digital Atlas – Montana Natural Resources Information System". Montana State Library, State of Montana. Archived from the original on July 15, 2007. Retrieved September 27, 2007.
^ "History of Yellowstone as a Place Name". www.yellowstone-online.com. Archived from the original on October 23, 2018. Retrieved April 2, 2018.