Jefferson County, Montana

Jefferson County is a county located in the U.S. state of Montana. As of the 2010 United States Census, the population was 11,406.[2] Its county seat is Boulder.[3] The county was created in 1865[4] and named for President Thomas Jefferson.[5]

Jefferson County
U.S. county
Jefferson County Courthouse in Boulder
Location within the U.S. state of Montana
Montana's location within the U.S.
Coordinates: 46°11′N 112°07′W
Country United States
State Montana
FoundedFebruary 2, 1865[1]
Named forThomas Jefferson
SeatBoulder
Largest townClancy
Area
 • Total1,659 sq mi (4,300 km2)
 • Land1,656 sq mi (4,290 km2)
 • Water2.6 sq mi (7 km2)  0.2%
Population
 (2010)
 • Total11,406
 • Estimate 
(2019)
12,221
 • Density7/sq mi (3/km2)
Time zoneUTC−7 (Mountain)
 • Summer (DST)UTC−6 (MDT)
Congressional districtAt-large
Websitewww.jeffersoncounty-mt.gov
 
  • Montana county number 51

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

Geography

According to the US 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.[6]

Major highways

Adjacent counties

National protected areas

Politics
Presidential elections results
Presidential elections results[7]
Year Republican Democratic Third parties
2016 62.2% 4,177 29.8% 1,998 8.0% 539
2012 62.2% 4,055 34.8% 2,272 3.0% 194
2008 55.8% 3,538 40.7% 2,582 3.5% 221
2004 65.5% 3,844 32.1% 1,881 2.4% 143
2000 64.1% 3,308 29.3% 1,513 6.6% 342
1996 46.8% 2,248 37.0% 1,775 16.2% 778
1992 36.5% 1,541 33.5% 1,415 30.0% 1,269
1988 52.3% 2,007 45.5% 1,746 2.2% 84
1984 61.5% 2,226 36.6% 1,324 1.9% 68
1980 57.1% 1,841 32.7% 1,055 10.1% 327
1976 52.3% 1,387 45.6% 1,210 2.2% 57
1972 56.1% 1,281 39.6% 904 4.4% 100
1968 45.1% 798 46.3% 820 8.6% 153
1964 40.6% 662 59.3% 967 0.1% 2
1960 51.4% 817 48.4% 769 0.3% 4
1956 61.4% 1,049 38.6% 660 0.0% 0
1952 60.8% 1,084 38.5% 687 0.7% 13
1948 45.6% 750 50.9% 836 3.5% 58
1944 49.7% 797 50.1% 803 0.2% 3
1940 39.6% 830 60.0% 1,259 0.4% 8
1936 27.8% 573 68.3% 1,409 3.9% 81
1932 37.1% 784 58.9% 1,246 4.0% 84
1928 57.0% 1,013 42.2% 751 0.8% 14
1924 36.5% 648 24.4% 434 39.1% 694
1920 54.5% 969 38.7% 688 6.9% 122
1916 36.6% 712 57.8% 1,124 5.6% 108
1912 20.0% 239 40.2% 479 39.8% 475
1908 39.2% 546 51.3% 714 9.5% 132
1904 45.5% 663 39.8% 580 14.6% 213

Demographics
Historical population
CensusPop.%±
18701,531—
18802,46460.9%
18906,026144.6%
19005,330−11.5%
19105,6015.1%
19205,203−7.1%
19304,133−20.6%
19404,66412.8%
19504,014−13.9%
19604,2977.1%
19705,23821.9%
19807,02934.2%
19907,93912.9%
200010,04926.6%
201011,40613.5%
Est. 201912,2217.1%
US Decennial Census[8]
1790-1960[9] 1900-1990[10]
1990-2000[11] 2010-2018[2] 2019[12]

2000 census

As of the 2000 United States Census,[13] there were 10,049 people, 3,747 households, and 2,847 families 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.

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.

The county population contained 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.

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.[14] 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).[15] 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.[14] 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.[16]

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.[14]

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.[17]

Communities

Towns

Census-designated places

Unincorporated communities

Former communities
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See also

References
  1. "Montana County Formation Table". genealogytrails.com. Retrieved April 3, 2018.
  2. "State & County QuickFacts". US Census Bureau. Archived from the original on June 6, 2011. Retrieved September 15, 2013.
  3. "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
  4. "Montana Place Names Companion". Montana Place Names From Alzada to Zortman. Montana Historical Society Research Center. Retrieved December 1, 2014.
  5. Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Govt. Print. Off. p. 168.
  6. "2010 Census Gazetteer Files". US Census Bureau. August 22, 2012. Archived from the original on December 5, 2014. Retrieved November 28, 2014.
  7. Leip, David. "Atlas of US Presidential Elections". uselectionatlas.org. Retrieved April 3, 2018.
  8. "US Decennial Census". US Census Bureau. Retrieved November 28, 2014.
  9. "Historical Census Browser". University of Virginia Library. Retrieved November 28, 2014.
  10. "Population of Counties by Decennial Census: 1900 to 1990". US Census Bureau. Retrieved November 28, 2014.
  11. "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). US Census Bureau. Retrieved November 28, 2014.
  12. "QuickFacts. Montana counties". Retrieved May 17, 2020.
  13. "U.S. Census website". US Census Bureau. Retrieved January 31, 2008.
  14. "Profile of General Population and Housing Characteristics: 2010 Demographic Profile Data". US Census Bureau. Archived from the original on February 13, 2020. Retrieved January 10, 2016.
  15. "Population, Housing Units, Area, and Density: 2010 - County". US Census Bureau. Archived from the original on February 13, 2020. Retrieved January 10, 2016.
  16. "Selected Social Characteristics in the US – 2006-2010 American Community Survey 5-Year Estimates". US Census Bureau. Archived from the original on February 13, 2020. Retrieved January 10, 2016.
  17. "Selected Economic Characteristics – 2006-2010 American Community Survey 5-Year Estimates". US Census Bureau. Archived from the original on February 13, 2020. Retrieved January 10, 2016.
  18. Amazon, Jefferson County MT Google Maps (accessed 2 January 2019)
  19. Bernice, Jefferson County MT Google Maps (accessed 2 January 2019)
  20. Elk Park, Jefferson County MT Google Maps (accessed 2 January 2019)
  21. Homestake, Jefferson County MT Google Maps (accessed 2 January 2019)
  22. Leadville, Jefferson County MT Google Maps (accessed 2 January 2019)
  23. La Hood Park, Jefferson County MT Google Maps (accessed 2 January 2019)
  24. Louisville, Jefferson County MT Google Maps (accessed 2 January 2019)
  25. Pappas Place, Jefferson County MT Google Maps (accessed 2 January 2019)
  26. Paul Place, Jefferson County MT Google Maps (accessed 2 January 2019)
  27. Piedmont, Jefferson County MT Google Maps (accessed 2 January 2019)
  28. Pipestone, Jefferson County MT Google Maps (accessed 2 January 2019)
  29. Renova, Jefferson County MT Google Maps (accessed 2 January 2019)

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