Jefferson County, Montana


Jefferson County is a county in Montana, United States. As of the 2020 census, the population was 12,085. Its county seat is Boulder. The county was created in 1865 and named for President Thomas Jefferson.
Jefferson County is part of the Helena, MT Micropolitan Statistical Area.
WWW jeffco.mt.gov

Geography

According to the United States Census Bureau, the county has a total area of, of which is land and is water.

Major highways

Adjacent counties

National protected areas

Demographics

2020 census

As of the 2020 census, there were 12,085 people living in the county.
Of the residents, 20.8% were under the age of 18 and 24.0% were 65 years of age or older; the median age was 49.2 years. For every 100 females there were 103.1 males, and for every 100 females age 18 and over there were 101.8 males. 0.0% of residents lived in urban areas and 100.0% lived in rural areas.
The racial makeup of the county was 91.2% White, 0.1% Black or African American, 1.3% American Indian and Alaska Native, 0.4% Asian, 0.8% from some other race, and 6.2% from two or more races. Hispanic or Latino residents of any race comprised 2.4% of the population.
There were 4,894 households in the county, of which 26.5% had children under the age of 18 living with them and 16.3% had a female householder with no spouse or partner present. About 23.8% of all households were made up of individuals and 12.1% had someone living alone who was 65 years of age or older.
There were 5,375 housing units, of which 8.9% were vacant. Among occupied housing units, 85.2% were owner-occupied and 14.8% were renter-occupied. The homeowner vacancy rate was 0.9% and the rental vacancy rate was 6.6%.

2010 census

As of the 2010 census, there were 11,406 people, 4,512 households, and 3,301 families residing in the county. The population density was. There were 5,055 housing units at an average density of. 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. 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.
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.
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.

Communities

Towns

Census-designated places

Unincorporated communities

Former communities

Education

Whitehall Public Schools has two components: Whitehall Elementary School District and Whitehall High School District.
High school districts include Jefferson High School District and Whitehall High School District.
Elementary school districts include: