Jefferson County, Montana facts for kids
Quick facts for kids
Jefferson County
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_-_Jefferson_County,_Montana.png)
Jefferson County Courthouse in Boulder
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Location within the U.S. state of Montana
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 Montana's location within the U.S. |
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| Country |  United States |
| State |  Montana |
| Founded | February 2, 1865 |
| Named for | Thomas Jefferson |
| Seat | Boulder |
| Largest town | Clancy |
| Area | |
| • Total | 1,659 sq mi (4,300 km2) |
| • Land | 1,656 sq mi (4,290 km2) |
| • Water | 2.6 sq mi (7 km2) 0.2% |
| Population
(2020)
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| • Total | 12,085 |
| • Density | 7/sq mi (3/km2) |
| Time zone | UTC−7 (Mountain) |
| • Summer (DST) | UTC−6 (MDT) |
| Congressional district | At-large |
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Jefferson County is a county in Montana, United States. As of the 2020 United States Census, the population was 12,085. 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.
Contents
Geography
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.
Major highways
Interstate 90
Interstate 15
U.S. Highway 12
U.S. Highway 287
Montana Highway 2
Montana Highway 41
Montana Highway 55
Montana Highway 69
Adjacent counties
- Lewis and Clark County, Montana - north
- Broadwater County, Montana - east
- Gallatin County, Montana - southeast
- Madison County, Montana - south
- Silver Bow County, Montana - west
- Deer Lodge County, Montana - west
- Powell County, Montana - northwest
National protected areas
- Deerlodge National Forest (part)
- Helena National Forest (part)
Demographics
| Historical population | |||
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| Census | Pop. | %± | |
| 1870 | 1,531 | — | |
| 1880 | 2,464 | 60.9% | |
| 1890 | 6,026 | 144.6% | |
| 1900 | 5,330 | −11.5% | |
| 1910 | 5,601 | 5.1% | |
| 1920 | 5,203 | −7.1% | |
| 1930 | 4,133 | −20.6% | |
| 1940 | 4,664 | 12.8% | |
| 1950 | 4,014 | −13.9% | |
| 1960 | 4,297 | 7.1% | |
| 1970 | 5,238 | 21.9% | |
| 1980 | 7,029 | 34.2% | |
| 1990 | 7,939 | 12.9% | |
| 2000 | 10,049 | 26.6% | |
| 2010 | 11,406 | 13.5% | |
| 2020 | 12,085 | 6.0% | |
| US Decennial Census 1790-1960 1900-1990 1990-2000 2010-2020 |
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2010 census
As of the 2010 United States Census, there were 11,406 people, 4,512 households, and 3,301 families residing in the county. The population density was 6.9 inhabitants per square mile (2.7/km2). There were 5,055 housing units at an average density of 3.1 per square mile (1.2/km2). The racial makeup of the county was 95.5% white, 1.4% American Indian, 0.4% Asian, 0.1% black or African American, 0.4% from other races, and 2.2% from two or more races. Those of Hispanic or Latino origin made up 2.0% of the population. In terms of ancestry, 31.3% were German, 19.1% were Irish, 17.2% were English, 10.8% were Norwegian, and 4.2% were American.
Of the 4,512 households, 28.8% had children under the age of 18 living with them, 63.7% were married couples living together, 5.4% had a female householder with no husband present, 26.8% were non-families, and 22.6% of all households were made up of individuals. The average household size was 2.48 and the average family size was 2.90. The median age was 46.2 years.
The median income for a household in the county was $56,695 and the median income for a family was $67,195. Males had a median income of $50,978 versus $34,148 for females. The per capita income for the county was $26,437. About 2.7% of families and 12.8% of the population were below the poverty line, including 5.1% of those under age 18 and 8.6% of those age 65 or over.
Communities
Towns
Census-designated places
Ghost towns
See also
In Spanish: Condado de Jefferson (Montana) para niños
