Jefferson County Demographics

A map of Jefferson County's Population by Race

Jefferson County, Montana had a population of 12,085 in 2020. It was 90.4% White, 0.1% Black, 0.4% Asian, 2.4% Hispanic, 1.7% Native American/Other, and 5.0% Multiracial. This map presents the population of Jefferson County, with one dot drawn for each person counted in the 2020 Census, color-coded by race.

Jefferson County is the 16th most populous county of the 56 counties in Montana.

Jefferson County's White Population

10,926 residents of Jefferson County identify as White, or 90.4%. This makes the White share of the population of Jefferson County slightly larger than the White share of the population of Montana (83.1% White). Of the 56 counties in Montana, Jefferson County is ranked #19 in terms of White residents as a share of the population.

Jefferson County is more White than neighboring Silver Bow County (88.5% White), and Lewis and Clark County (87.4% White). Jefferson County is less White than neighboring Broadwater County (90.8% White), and Madison County (92.3% White).

Jefferson County's Black Population

15 residents of Jefferson County identify as Black, or 0.1%. This makes the Black share of the population of Jefferson County roughly similar to the Black share of the population of Montana (0.5% Black). Of the 56 counties in Montana, Jefferson County is ranked #45 in terms of Black residents as a share of the population.

Jefferson County is less Black than neighboring Silver Bow County (0.4% Black), Broadwater County (0.3% Black), Deer Lodge County (0.2% Black), and Lewis and Clark County (0.4% Black).

Jefferson County's Asian Population

49 residents of Jefferson County identify as Asian, or 0.4%. This makes the Asian share of the population of Jefferson County roughly similar to the Asian share of the population of Montana (0.7% Asian). Of the 56 counties in Montana, Jefferson County is ranked #26 in terms of Asian residents as a share of the population.

Jefferson County is more Asian than neighboring Broadwater County (0.1% Asian), and Madison County (0.3% Asian). Jefferson County is less Asian than neighboring Silver Bow County (0.6% Asian), and Lewis and Clark County (0.8% Asian).

Jefferson County's Hispanic Population

291 residents of Jefferson County identify as Hispanic, or 2.4%. This makes the Hispanic share of the population of Jefferson County roughly similar to the Hispanic share of the population of Montana (4.2% Hispanic). Of the 56 counties in Montana, Jefferson County is ranked #40 in terms of Hispanic residents as a share of the population.

Jefferson County is less Hispanic than neighboring Silver Bow County (4.7% Hispanic), Broadwater County (3% Hispanic), Madison County (2.8% Hispanic), Deer Lodge County (2.8% Hispanic), and Lewis and Clark County (3.7% Hispanic).

Jefferson County's Native American/Other Population

204 residents of Jefferson County identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other, or 1.7%. This makes the Native American/Other share of the population of Jefferson County roughly similar to the Native American/Other share of the population of Montana (6.4% Native American/Other). Of the 56 counties in Montana, Jefferson County is ranked #33 in terms of Native American/Other residents as a share of the population.

Jefferson County is more Native American/Other than neighboring Broadwater County (1% Native American/Other), and Madison County (0.9% Native American/Other). Jefferson County is less Native American/Other than neighboring Silver Bow County (1.8% Native American/Other), Deer Lodge County (2.5% Native American/Other), and Lewis and Clark County (2.2% Native American/Other).

Jefferson County's Multiracial Population

600 residents of Jefferson County identify as Multiracial, or 5.0%. This makes the Multiracial share of the population of Jefferson County roughly similar to the Multiracial share of the population of Montana (5% Multiracial). Of the 56 counties in Montana, Jefferson County is ranked #18 in terms of Multiracial residents as a share of the population.

Jefferson County is more Multiracial than neighboring Silver Bow County (4.1% Multiracial), Broadwater County (4.9% Multiracial), Madison County (3.6% Multiracial), and Deer Lodge County (3.7% Multiracial). Jefferson County is less Multiracial than neighboring Lewis and Clark County (5.5% Multiracial).

Source: 2020 Census State Redistricting Data and Census TIGER/Line Shapefiles.