In 2018, Jefferson County, MT had a population of 11.8k people with a median age of 47.9 and a median household income of $66,867. Between 2017 and 2018 the population of Jefferson County, MT grew from 11,625 to 11,778, a 1.32% increase and its median household income grew from $64,911 to $66,867, a 3.01% increase.
The 5 largest ethnic groups in Jefferson County, MT are White (Non-Hispanic) (92.8%), Two+ (Non-Hispanic) (3.37%), White (Hispanic) (1.88%), American Indian & Alaska Native (Non-Hispanic) (1.09%), and Other (Hispanic) (0.45%). NaNk% of the people in Jefferson County, MT speak a non-English language, and 99.7% are U.S. citizens.
The median property value in Jefferson County, MT is $277,500, and the homeownership rate is 85%. 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.
Jefferson County, MT borders Broadwater County, MT, Deer Lodge County, MT, Lewis and Clark County, MT, Madison County, MT, Powell County, MT, Silver Bow County, MT, and Gallatin County, MT.