Jefferson County, Montana Population 2024

13,534

Jefferson County, Montana's estimated 2024 population is 13,534 with a growth rate of 2.69% in the past year according to the most recent United States census data. Jefferson County, Montana is the 15th largest county in Montana. The 2010 population was 11,406 and has seen a growth of 18.66% since that time.

Note: data after 2022 is projected based on recent change

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Year
Population
Growth
Growth Rate
202915,3043542.37%
202814,9503542.43%
202714,5963542.49%
202614,2423542.55%
202513,8883542.62%
202413,5343542.69%
202313,1803542.76%
202212,8263542.84%
202112,4723322.73%
202012,140-71-0.58%
201912,2111271.05%
201812,0841661.39%
201711,9181441.22%
201611,7741981.71%
201511,576710.62%
201411,505480.42%
201311,4571381.22%
201211,319-54-0.47%
201111,373-33-0.29%
201011,406
19907,93991012.95%
19807,0291,79134.19%
19705,23894121.9%
19604,2972837.05%
19504,014-650-13.94%
19404,66453112.85%
19304,133-1,070-20.57%
19205,203-398-7.11%
19105,6012715.08%
19005,330-696-11.55%
18906,0263,562144.56%
18802,46493360.94%
18701,531-13,773-90%
showing: 33 rows
2024 Growth Rate
2.69% (354)
County Website
Jefferson County
State
Montana
County Seat
2020 Population
12,140
Area
1657 mi²
Density
8 people/mi²
Growth Since 2020
11.48% (1,394)
Founded
February 2, 1865

Jefferson County, Montana Population 2024

Population by Race

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Race
Population
Percentage (of total)
White11,43793.19%
Two or more races5354.36%
Native American1401.14%
Other race750.61%
Asian490.4%
Black or African American370.3%
Native Hawaiian or Pacific Islander
showing: 7 rows

White

Two or more races

Native American

Other race

Asian

Black or African American

Native Hawaiian or Pacific Islander

Jefferson County, Montana Population by Race

Jefferson County, Montana Population Pyramid 2024

Jefferson County, Montana Median Age

47.4

Total

47.2

Male

47.6

Female

Jefferson County, Montana Adults

There are 9,807 adults, (2,752 of whom are seniors) in Jefferson County, Montana.

Jefferson County, Montana Age Dependency

74

Age Dependency Ratio

39

Old Age Dependency Ratio

35

Child Dependency Ratio

Jefferson County, Montana Sex Ratio

Female5,99148.81%
Male6,28251.19%

Jefferson County, Montana Population by Age

Jefferson County, Montana Renter vs Owner Occupied by Household Type

Household Type
Count
Average Size
Owner
Renter
All4,6812.5683.116.9
Married3,1362.9489.810.2
Non Family1,1611.2370.929.1
Female2253.8859.140.9
Male1592.7873.626.4
showing: 5 rows

2.95

Average Family Size

2.56

Average Household Size

83.1%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

Jefferson County, Montana Households and Families

Male

Female

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Less Than 9th Grade

9th to 12th Grade

High School Graduate

Some College

Associates Degree

Bachelors Degree

Graduate Degree

Jefferson County, Montana Educational Attainment by Sex (over 25)

Jefferson County, Montana Educational Attainment by Race

High School Graduation Rate

Bachelors Rate

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The highest rate of high school graduation is among black people with a rate of 100%.

The highest rate of bachelors degrees is among black people with a rate of 67.86%.

Jefferson County, Montana Educational Attainment by Race

All

Male

Female

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$42,860

Average Earnings

$56,090

Average Male

$32,679

Average Female

Jefferson County, Montana Earnings by Educational Attainment

Jefferson County, Montana Language by Age

Only English

Spanish

Other Indo-European Languages

Asian and Pacific Island Languages

Other Languages

Jefferson County, Montana Language

96.95% of Jefferson County, Montana residents speak only English, while 3.05% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 1.84% of the population.

Jefferson County, Montana Language

Jefferson County, Montana Poverty by Race

rate

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Name
Total
In Poverty
Poverty Rate
White11,0515895.33%
Hispanic34492.62%
Multiple53361.13%
Black37513.51%
showing: 4 rows

5.06%

Overall Poverty Rate

4.53%

Male Poverty Rate

5.61%

Female Poverty Rate

Poverty in Jefferson County, Montana

The race most likely to be in poverty in Jefferson County, Montana is Black, with 13.51% below the poverty level.

The race least likely to be in poverty in Jefferson County, Montana is Multiple, with 1.13% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.01%. Among those working part-time, it was 6.5%, and for those that did not work, the poverty rate was 8.52%.

Jefferson County, Montana Poverty

rate

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Rate
Poverty
Less Than 9th Grade14.15%
High School7.45%
Some College4.56%
Bachelors or Greater3.72%
showing: 4 rows

Jefferson County, Montana Poverty Rate by Education

rate

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Rate
Poverty
Male Employed3.75%
Female Employed3.11%
Male Unemployed0.85%
Female Unemployed
showing: 4 rows

Jefferson County, Montana Poverty Rate by Employment Status and Sex

Jefferson County, Montana Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

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mean

median

Income by Household Type

Jefferson County, Montana Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

63.4%

Overall Marriage Rate

62.1%

Male Marriage Rate

64.6%

Female Marriage Rate

Jefferson County, Montana Married by Age and Sex

male

female

Jefferson County, Montana Marriage

The age group where males are most likely to be married is 35-44, while the female age group most likely to be married is 45-54.

Jefferson County, Montana Marital Status by Race

Married

Widowed

Divorced

Separated

NeverMarried

Jefferson County, Montana Marital Status

Second Gulf War

First Gulf War

Vietnam

Korea

World War II

1,171

Number of Veterans

1,083

Male Veterans

88

Female Veterans

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Jefferson County, Montana Veterans by War

count

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Jefferson County, Montana Veterans by Age

count

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Jefferson County, Montana Veterans by Race

Jefferson County, Montana Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

1.9%

Veteran Poverty Rate

37.42%

Veteran Disability Rate

Jefferson County, Montana Veterans by Education

LaborForceParticipation

57.5%

Labor Force Participation

55.5%

Employment Rate

3.4%

Unemployment Rate

Jefferson County, Montana Employment by Age

LaborForceParticipation

Jefferson County, Montana Employment by Race

LaborForceParticipation

Jefferson County, Montana Employment by Education

Origin of Non-Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

50.46%

Born in Jefferson County, Montana

97.82%

Native Born

2.18%

Foreign Born

0.91%

Non Citizen

1.27%

Naturalized

Place of Birth

97.82% of Jefferson County, Montana residents were born in the United States, with 50.46% having been born in Montana. 0.91% 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

Sources