Jefferson County, MT — Demographics & Population
Population, age distribution, race & ethnicity, and education data
Population Overview
Source: Census Bureau ACS (2023)Total Population
12,501
Male
6,337
50.7%
Female
6,164
49.3%
Median Age
47.3 yrs
Avg Household Size
2.5
Foreign Born
2.2%
Race & Ethnicity
Source: Census Bureau ACS (2023)Age Distribution
Source: Census Bureau ACS (2023)Education
Source: Census Bureau ACS (2023)Bachelor's or Higher24.0%
High School or Higher43.3%
Other Demographics
Source: Census Bureau ACS (2023)Veterans
8.9%
Disability
0.0%
Non-English Home
4.4%
Married
54.6%
Jefferson County, MT has a population of 12,501 according to 2023 Census Bureau estimates. The median age is 47.3 years. The largest racial or ethnic group is White at 92.8% of the population. 24.0% of residents hold a bachelor's degree or higher. 2.2% of residents are foreign-born.