Jefferson County, Montana

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Jefferson County, Montana
Jeffersoncourthouse.jpg
Jefferson County Courthouse in Boulder
Map of Montana highlighting Jefferson County
Location in the state of Montana
Map of the United States highlighting Montana
Montana's location in the U.S.
Founded 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
 • (2010) 11,406
 • Density 6.9/sq mi (3/km²)
Congressional district At-large
Time zone Mountain: UTC-7/-6
Website www.jeffco.mt.gov

Jefferson County is a county located in the U.S. state of Montana. As of the 2010 census, the population was 11,406.[1] Its county seat is Boulder.[2] The county was created in 1865[3] and named for President Thomas Jefferson.[4]

Jefferson County is part of the Helena, MT Micropolitan Statistical Area.

Geography[edit]

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.[5]

Major highways[edit]

Adjacent counties[edit]

National protected areas[edit]

Demographics[edit]

Historical population
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%
Est. 2013 11,512 0.9%
U.S. Decennial Census[6]
1790-1960[7] 1900-1990[8]
1990-2000[9] 2010-2013[1]

As of the census[10] 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 according to Census 2000.

There were 3,747 households out of which 35.60% had children under the age of 18 living with them, 67.10% were married couples living together, 5.90% had a female householder with no husband present, and 24.00% were non-families. 20.20% of all households were made up of individuals and 7.30% had someone living alone who was 65 years of age or older. The average household size was 2.62 and the average family size was 3.03.

In the county the population was spread out with 27.80% under the age of 18, 5.20% from 18 to 24, 26.80% from 25 to 44, 29.90% from 45 to 64, and 10.30% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 100.80 males. For every 100 females age 18 and over, there were 100.40 males.

The median income for a household in the county was $41,506, and the median income for a family was $48,912. Males had a median income of $34,753 versus $25,011 for females. The per capita income for the county was $18,250. About 6.70% of families and 9.00% of the population were below the poverty line, including 10.40% of those under age 18 and 9.60% of those age 65 or over.

Communities[edit]

Towns[edit]

Census-designated places[edit]

Ghost towns[edit]

See also[edit]

References[edit]

  1. ^ a b "State & County QuickFacts". United States Census Bureau. Retrieved September 15, 2013. 
  2. ^ "Find a County". National Association of Counties. Retrieved 2011-06-07. 
  3. ^ "Montana Place Names Companion". Montana Place Names From Alzada to Zortman. Montana Historical Society Research Center. Retrieved December 1, 2014. 
  4. ^ Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Govt. Print. Off. p. 168. 
  5. ^ "2010 Census Gazetteer Files". United States Census Bureau. August 22, 2012. Retrieved November 28, 2014. 
  6. ^ "U.S. Decennial Census". United States Census Bureau. Retrieved November 28, 2014. 
  7. ^ "Historical Census Browser". University of Virginia Library. Retrieved November 28, 2014. 
  8. ^ "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved November 28, 2014. 
  9. ^ "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000". United States Census Bureau. Retrieved November 28, 2014. 
  10. ^ "American FactFinder". United States Census Bureau. Retrieved 2008-01-31. 

Coordinates: 46°11′N 112°07′W / 46.18°N 112.11°W / 46.18; -112.11