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World Population Review
Jefferson County, Montana Population 2021
Jefferson County, Montana's estimated population is 12,475 with a growth rate of 1.03% in the past year according to the most recent United States census data. Jefferson County, Montana is the 16th largest county in Montana. The 2010 Population was 11,407 and has seen a growth of 9.36% since this time.
Note: 2020 and 2021 data is projected
| Year | Population | Growth | Growth Rate |
|---|---|---|---|
| 2021 | 12,475 | 127 | 1.03% |
| 2020 | 12,348 | 127 | 1.04% |
| 2019 | 12,221 | 127 | 1.05% |
| 2018 | 12,094 | 173 | 1.45% |
| 2017 | 11,921 | 142 | 1.21% |
| 2016 | 11,779 | 207 | 1.79% |
| 2015 | 11,572 | 70 | 0.61% |
| 2014 | 11,502 | 47 | 0.41% |
| 2013 | 11,455 | 137 | 1.21% |
| 2012 | 11,318 | -57 | -0.50% |
| 2011 | 11,375 | -32 | -0.28% |
| 2010 | 11,407 | 3,468 | 43.68% |
| 1990 | 7,939 | 910 | 12.95% |
| 1980 | 7,029 | 1,791 | 34.19% |
| 1970 | 5,238 | 941 | 21.90% |
| 1960 | 4,297 | 283 | 7.05% |
| 1950 | 4,014 | -650 | -13.94% |
| 1940 | 4,664 | 531 | 12.85% |
| 1930 | 4,133 | -1,070 | -20.57% |
| 1920 | 5,203 | -398 | -7.11% |
| 1910 | 5,601 | 271 | 5.08% |
| 1900 | 5,330 | -696 | -11.55% |
| 1890 | 6,026 | 3,562 | 144.56% |
| 1880 | 2,464 | 933 | 60.94% |
| 1870 | 1,531 | 0.00% |
2021 Growth Rate
1.03%
County Website
State
Founded
February 2, 1865[1]
County Seat
Lat./Long.
2010 Population
11,407
Growth Since 2010
9.36%
Jefferson County, Montana Population Growth
| Race | Population | Percentage |
|---|---|---|
| White | 11,220 | 94.15% |
| Two or More Races | 399 | 3.35% |
| American Indian and Alaska Native | 125 | 1.05% |
| Some Other Race | 122 | 1.02% |
| Black or African American | 45 | 0.38% |
| Asian | 6 | 0.05% |
Jefferson County, Montana Population by Race
Jefferson County, Montana Population Pyramid $2021
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Jefferson County, Montana Population by Age
Jefferson County, Montana Households and Families
| Type | Count | Average Size | Owned |
|---|---|---|---|
| All | 4,484 | 2.6 | 84.3 |
| Married | 2,831 | 3.01 | 92.7 |
| Non Family | 1,229 | 1.26 | 71.9 |
| Female | 224 | 3.73 | 66.5 |
| Male | 200 | 3.68 | 61.5 |
3.01
Average Family Size
2.6
Average Household Size
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Jefferson County, Montana Households by Type
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| Education Attained | Count | Percentage |
|---|---|---|
| Less Than 9th Grade | 104 | 1.20% |
| 9th to 12th Grade | 391 | 4.53% |
| High School Graduate | 2,291 | 26.52% |
| Some College | 1,933 | 22.38% |
| Associates Degree | 898 | 10.39% |
| Bachelors Degree | 2,152 | 24.91% |
| Graduate Degree | 870 | 10.07% |
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Jefferson County, Montana Educational Attainment by Sex (over 25)
Jefferson County, Montana Educational Attainment by Race
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| Race | Total | High School | Bachelors |
|---|---|---|---|
| White | 8,171 | 7,721 | 2,927 |
| 2+ Races | 263 | 263 | 40 |
| Hispanic | 107 | 93 | 27 |
| Native American | 64 | 33 | |
| Black | 33 | 33 | 30 |
| Other Race | 7 | 7 | 7 |
| Asian | 6 | 6 |
The highest rate of high school graduation is among black people with a rate of 100.00%.
The highest rate of bachelors degrees is among other race people with a rate of 100.00%.
Jefferson County, Montana Educational Attainment by Race
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$40,313
Average Earnings
$46,771
Average Male
$31,502
Average Female
Jefferson County, Montana Earnings by Educational Attainment
Jefferson County, Montana Language by Age
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Jefferson County, Montana Language
98.71% of Jefferson County, Montana residents speak only English, while 1.29% speak other languages. The non-English language spoken by the largest group is Other Indo-European, which is spoken by 0.56% of the population.
Jefferson County, Montana Language
Jefferson County, Montana Poverty by Race
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| Name | Total | In Poverty | Poverty Rate |
|---|---|---|---|
| White | 10,943 | 856 | 7.82% |
| Multiple | 397 | 40 | 10.08% |
| Hispanic | 275 | 18 | 6.55% |
| Native | 86 | 3 | 3.49% |
7.81%
Overall Poverty Rate
7.41%
Male Poverty Rate
8.22%
Female Poverty Rate
Poverty in Jefferson County, Montana
The race most likely to be in poverty in Jefferson County, Montana is Multiple, with 10.08% below the poverty level.
The race least likely to be in poverty in Jefferson County, Montana is Native, with 3.49% below the poverty level.
The poverty rate among those that worked full-time for the past 12 months was 1.86%. Among those working part-time, it was 8.83%, and for those that did not work, the poverty rate was 14.06%.
Jefferson County, Montana Poverty
Jefferson County, Montana Poverty Rate by Education
Jefferson County, Montana Marital Status
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Marriage Rates
59.4%
Overall Marriage Rate
57.5%
Male Marriage Rate
61.3%
Female Marriage Rate
Jefferson County, Montana Married by Age and Sex
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Jefferson County, Montana Marriage
The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 45-54.
Jefferson County, Montana Marital Status by Race
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Jefferson County, Montana Marital Status
Jefferson County, Montana Veterans by War
Jefferson County, Montana Veterans by Age
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| Name | Veterans | % of Total |
|---|---|---|
| White | 1,191 | 13.32% |
| 2+ Races | 67 | 21.20% |
| Native American | 10 | 14.71% |
| Hispanic | 3 | 2.29% |
Jefferson County, Montana Veterans by Race
Jefferson County, Montana Veterans by Education
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2.81%
Veteran Poverty Rate
41.30%
Veteran Disability Rate
Jefferson County, Montana Veterans by Education
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57.7%
Labor Force Participation
55.1%
Employment Rate
3.9%
Unemployment Rate
Jefferson County, Montana Employment by Age
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Jefferson County, Montana Employment by Race
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Jefferson County, Montana Employment by Education
Origin of Non-Citizens
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Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.
Origin of Naturalized Citizens
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98.94%
Native Born
1.06%
Foreign Born
0.44%
Non Citizen
0.61%
Naturalized
Place of Birth
98.94% of Jefferson County, Montana residents were born in the United States, with 53.23% having been born in Montana. 0.44% of residents are not US citizens. Of those not born in the United States, the largest percentage are from North America.
Jefferson County, Montana Place of Birth
- US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
- Population of States and Counties of the United States: 1790 - 1990