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
202112,4751271.03%
202012,3481271.04%
201912,2211271.05%
201812,0941731.45%
201711,9211421.21%
201611,7792071.79%
201511,572700.61%
201411,502470.41%
201311,4551371.21%
201211,318-57-0.50%
201111,375-32-0.28%
201011,4073,46843.68%
19907,93991012.95%
19807,0291,79134.19%
19705,23894121.90%
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%
18701,5310.00%
2021 Growth Rate
1.03%
County Website
State
Founded
February 2, 1865[1]
County Seat
2010 Population
11,407
Growth Since 2010
9.36%
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Jefferson County, Montana Population Growth

Population by Race

Race Population Percentage
White11,22094.15%
Two or More Races3993.35%
American Indian and Alaska Native1251.05%
Some Other Race1221.02%
Black or African American450.38%
Asian60.05%
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Jefferson County, Montana Population by Race

Jefferson County, Montana Population Pyramid $2021

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Jefferson County, Montana Median Age

47.6


Total

47.6


Male

47.6


Female

Jefferson County, Montana Adults

There are 9,405 adults, (2,448 of whom are seniors) in Jefferson County, Montana.

Jefferson County, Montana Age Dependency

71.3

Age Dependency Ratio

35.2

Old Age Dependency Ratio

36.1

Child Dependency Ratio

Jefferson County, Montana Sex Ratio

Female

5,890

49.43%

Male

6,027

50.57%

Jefferson County, Montana Population by Age

Jefferson County, Montana Renter vs Owner Occupied by Household Type

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Jefferson County, Montana Household Types

Type Owner Renter
Married92.7%7.3%
All84.3%15.7%
Non Family71.9%28.1%
Female66.5%33.5%
Male61.5%38.5%

84.3%

Rate of Home Ownership

Jefferson County, Montana Households and Families

Type Count Average Size Owned
All4,4842.684.3
Married2,8313.0192.7
Non Family1,2291.2671.9
Female2243.7366.5
Male2003.6861.5

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 Grade1041.20%
9th to 12th Grade3914.53%
High School Graduate2,29126.52%
Some College1,93322.38%
Associates Degree89810.39%
Bachelors Degree2,15224.91%
Graduate Degree87010.07%
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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
White8,1717,7212,927
2+ Races26326340
Hispanic1079327
Native American6433
Black333330
Other Race777
Asian66

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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Name Average Male Female
Overall$40,313$46,771$31,502
Less Than 9th Grade$$$2,500
High School Graduate$31,742$42,404$21,786
Some College$37,708$46,101$29,886
Bachelors Degree$43,537$51,563$39,338
Graduate Degree$71,442$90,000$68,125

$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
White10,9438567.82%
Multiple3974010.08%
Hispanic275186.55%
Native8633.49%

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

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Name Poverty
Less Than 9th Grade16.48%
High School9.27%
Bachelors or Greater6.51%
Some College5.49%

Jefferson County, Montana Poverty Rate by Education

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Rate Poverty
Female Unemployed10.34%
Male Unemployed9.71%
Male Employed4.62%
Female Employed4.33%

Jefferson County, Montana Poverty Rate by Employment Status and Sex

Jefferson County, Montana Income by Household Type

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Name Median Mean
Households$69,646$83,162
Families$81,464$95,014
Married Families$86,949-
Non Families$38,164$48,193
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Income by Household Type

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

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1,268

Number of Veterans

1,115

Male Veterans

153

Female Veterans

War Veterans
Vietnam598
First Gulf War342
Second Gulf War148
Korea88
World War II15

Jefferson County, Montana Veterans by War

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Age Group Veterans
65 to 74369
35 to 54320
55 to 64301
75+253
18 to 3425

Jefferson County, Montana Veterans by Age

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Name Veterans % of Total
White1,19113.32%
2+ Races6721.20%
Native American1014.71%
Hispanic32.29%

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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53.23%

Born in Jefferson County, Montana

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

  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990

Sources