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The 2009 Jefferson County, MT, population is 11,121. There are 7 people per square mile (population density).
The median age is 40.6. The US median is 37.6. 68.63% of people in Jefferson County, MT, are married. 9.52% are divorced.
The average household size is 2.65 people. 29.76% of people are married, with children. 5.54% have children, but are single.
95.24% of people are white, 0.14% are black, 0.57% are asian, 1.31% are native american, and 2.12% claim 'Other'.
1.86% of the people in Jefferson County, MT, claim hispanic ethnicity (meaning 98.14% are non-hispanic).
Jefferson, MT People data
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