Yellowstone County, Montana
Yellowstone County, Montana
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Yellowstone County, Montana

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Yellowstone County, Montana

Yellowstone County is a county in the U.S. state of Montana. As of the 2020 census, the population was 164,731, and was estimated to be 172,692 in 2025, making it the most populous county in Montana. The county seat and the largest city is Billings, the most populous city in Montana and the 253rd-most populous city in the United States. It contains over 15.09% of the state's population. Like the nearby national 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 part of the Billings metropolitan area, which comprises all of Carbon, Stillwater, and Yellowstone Counties.

Yellowstone County was created on February 26, 1883 and organized on May 1, 1883.

According to the United States Census Bureau, the county has a total area of 2,649.035 square miles (6,860.97 km2), of which 2,633.402 square miles (6,820.48 km2) is land and 15.633 square miles (40.49 km2) (0.59%) is water. It is the 23rd largest county in Montana by total area.

As of the fourth quarter of 2025, the median home value in Yellowstone County was $386,158.

As of the 2024 American Community Survey, there are 70,714 estimated households in Yellowstone County with an average of 2.37 persons per household. The county has a median household income of $76,858. Approximately 7.9% of the county's population lives at or below the poverty line. Yellowstone County has an estimated 63.7% employment rate, with 32.2% of the population holding a bachelor's degree or higher and 93.8% holding a high school diploma. There were 75,777 housing units at an average density of 28.78 per square mile (11.1/km2).

The median age in the county was 40.2 years.

As of the 2024 estimate, there were 171,583 people, 70,714 households, and _ families residing in the county. The population density was 65.16 inhabitants per square mile (25.2/km2). There were 75,777 housing units at an average density of 28.78 per square mile (11.1/km2). The racial makeup of the county was 89.60% White, 0.68% African American, 5.36% Native American, 0.82% Asian, 0.10% Pacific Islander, _% from some other races and 3.44% from two or more races. Hispanic or Latino people of any race were 7.05% of the population.

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