In 2017, Jefferson County, MT had a population of 11.6k people with a median age of 47.9 and a median household income of $64,911. Between 2016 and 2017 the population of Jefferson County, MT grew from 11,601 to 11,625, a 0.207% increase and its median household income grew from $62,939 to $64,911, a 3.13% increase.
The 5 largest ethnic groups in Jefferson County, MT are White (Non-Hispanic) (93%), Two or More Races (Non-Hispanic) (2.98%), White (Hispanic) (1.72%), American Indian & Alaska Native (Non-Hispanic) (1.45%), and Some Other Race (Hispanic) (0.387%). N/A% of the people in Jefferson County, MT speak a non-English language, and 99.2% are U.S. citizens.
The median property value in Jefferson County, MT is $264,000, and the homeownership rate is 85.1%. Most people in Jefferson County, MT commute by Drove Alone, and the average commute time is 19.2 minutes. The average car ownership in Jefferson County, MT is 3 cars per household.