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The total population of Jefferson County is estimated to be 12,273 with 6,282 males (51.19%) and 5,991 females (48.81%). There are 291 less females than males in Jefferson County.
The median household income in Jefferson County was $78,366 in 2021, which marked an a decrease of 2,970(3.65%) from $81,336 in 2020. This income is 105.04% of the U.S. median household income of $74,606 (all incomes in 2022 inflation-adjusted dollars).
Per the latest American Community Survey by the Census Bureau, Jefferson County sees its highest median household income among householders in the age group of 25 to 44 years old, at $98,403. Overall, the median household income for the county of Jefferson County stands at $78,366.
In Jefferson County, the median income for all workers aged 15 years and older, regardless of work hours, was $45,607 for males and $27,973 for females. However, when specifically considering full-time, year-round workers within the same age group, the median income was $70,445 for males and $51,274 for females.
In Jefferson County, there are just two different racial groups among households. Among these, Two or More Races households report a median household income of $85,122, while White households have a median household income of $78,521.
In 2022, the population of Jefferson County was 12,826, a 2.84% increase year-by-year from 2021. Previously, in 2021, Jefferson County's population was 12,472, an increase of 2.73% compared to a population of 12,140 in 2020.
The median age in Jefferson County, MT is 47.5, as per 2021 ACS 5-Year Estimates. Of the total population, 16.17% were under the age of 15, 15.20% aged 15 to 29, 46.76% aged 30 to 64, 20.08% aged 65 to 84, and 1.78% were 85 years of age and older.
Racial distribution of Jefferson County population: 93.38% are White, 0.45% are Black or African American, 1.17% are American Indian and Alaska Native, 0.14% are Asian, 0.41% are some other race and 4.45% are multiracial.