Yellowstone County, Montana
| Yellowstone County, Montana | ||
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 Location in the U.S. state of Montana |
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 Montana's location in the U.S. |
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| Founded | February 26, 1883 | |
| Named for | Yellowstone River | |
| Seat | Billings | |
| Largest city | Billings | |
| Area | ||
| • Total | 2,649 sq mi (6,861 km2) | |
| • Land | 2,633 sq mi (6,819 km2) | |
| • Water | 16 sq mi (41 km2), 0.6% | |
| Population (est.) | ||
| • (2015) | 157,048 | |
| • Density | 59/sq mi (23/km²) | |
| Congressional district | At-large | |
| Time zone | Mountain: UTC-7/-6 | |
| Website | www |
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Yellowstone County is the most populous county in the U.S. state of Montana. As of the 2010 census, the population was 147,972, and a 2014 estimate put the population at 155,634. 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 U.S. Census Bureau, the county has a total area of 2,649 square miles (6,860 km2), of which 2,633 square miles (6,820 km2) is land and 16 square miles (41 km2) (0.6%) is water.
As of the census of 2000, there were 129,352 people, 52,084 households, and 34,219 families residing in the county. The population density was 49 people per square mile (19/km²). There were 54,563 housing units at an average density of 21 per square mile (8/km²). The racial makeup of the county was 92.78% White, 0.45% Black or African American, 3.05% Native American, 0.54% Asian, 0.04% Pacific Islander, 1.26% from other races, and 1.87% from two or more races. 3.70% of the population were Hispanic or Latino of any race. 31.1% were of German, 10.4% Norwegian, 9.7% Irish, 9.3% English and 5.4% American ancestry.
There were 52,084 households out of which 31.60% had children under the age of 18 living with them, 51.80% were married couples living together, 10.10% had a female householder with no husband present, and 34.30% were non-families. 27.90% of all households were made up of individuals and 10.10% had someone living alone who was 65 years of age or older. The average household size was 2.43 and the average family size was 2.98.
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