Jefferson County, Montana
| Jefferson County, Montana | |
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Jefferson County Courthouse in Boulder
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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 2, 1865 |
| Named for | Thomas Jefferson |
| Seat | Boulder |
| Largest town | Boulder |
| Area | |
| • Total | 1,659 sq mi (4,297 km2) |
| • Land | 1,656 sq mi (4,289 km2) |
| • Water | 2.6 sq mi (7 km2), 0.2% |
| Population (est.) | |
| • (2015) | 11,645 |
| • Density | 7.2/sq mi (3/km²) |
| Congressional district | At-large |
| Time zone | Mountain: UTC-7/-6 |
| Website | www |
Jefferson County is a county located in the U.S. state of Montana. As of the 2010 census, the population was 11,406. Its county seat is Boulder. The county was created in 1865 and named for President Thomas Jefferson.
Jefferson County is part of the Helena, MT Micropolitan Statistical Area.
According to the U.S. Census Bureau, the county has a total area of 1,659 square miles (4,300 km2), of which 1,656 square miles (4,290 km2) is land and 2.6 square miles (6.7 km2) (0.2%) is water.
As of the census of 2000, there were 10,049 people, 3,747 households, and 2,847 families residing in the county. The population density was 6 people per square mile (2/km²). There were 4,199 housing units at an average density of 2 per square mile (1/km²). The racial makeup of the county was 96.07% White, 0.14% Black or African American, 1.26% Native American, 0.42% Asian, 0.07% Pacific Islander, 0.38% from other races, and 1.66% from two or more races. 1.48% of the population were Hispanic or Latino of any race. 22.9% were of German, 13.1% English, 12.9% Irish, 7.9% Norwegian and 5.3% American ancestry.
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