Jefferson County, Montana Population 2020

Jefferson County, Montana's estimated population is 11,937 with a growth rate of 1.35% in the past year according to the most recent United States census data. Jefferson County, Montana is the 15th largest county in Montana.

Year Population Growth Growth Rate
201812,0971601.34%
201711,9371591.35%
201611,7782041.76%
201511,574720.63%
201411,502460.40%
201311,4561381.22%
201211,318-57-0.50%
201111,375-33-0.29%
201011,4083,46943.70%
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%

How Many People Live in Jefferson County, Montana?

11,937

Population by Race

Race Population Percentage
White11,15494.70%
Two or More Races4083.46%
American Indian and Alaska Native1281.09%
Some Other Race540.46%
Black or African American260.22%
Asian80.07%

Jefferson County, Montana Population Pyramid 2020

Jefferson County, Montana Median Age

47.9


Total

48


Male

47.8


Female

Jefferson County, Montana Adults

There are 9,312 adults, (2,362 of whom are seniors) in Jefferson County, Montana.

Jefferson County, Montana Age Dependency

69.5

Age Dependency Ratio

34

Old Age Dependency Ratio

35.5

Child Dependency Ratio

Jefferson County, Montana Sex Ratio

Female

5,799

49.24%

Male

5,979

50.76%

Jefferson County, Montana Households and Families

Jefferson County, Montana Renter vs Owner Occupied by Household Type

Jefferson County, Montana Household Types

Type Owner Renter
Married92.2%7.8%
All85%15%
Non Family75.2%24.8%
Male73.4%26.6%
Female62.4%37.6%

85.0%

Rate of Home Ownership

Type Count Average Size Owned
All4,4442.5985
Married2,7722.9992.2
Non Family1,2211.2475.2
Female2743.8662.4
Male1773.6473.4

3.01

Average Family Size

2.59

Average Household Size

4.2%

Unmarried (Opposite Sex)

0.3%

Unmarried (Same Sex)

Jefferson County, Montana Education

Education Attained Count Percentage
Less Than 9th Grade1111.30%
9th to 12th Grade3303.86%
High School Graduate2,43528.48%
Some College1,95822.90%
Associates Degree8069.43%
Bachelors Degree2,06124.11%
Graduate Degree8489.92%

Jefferson County, Montana Educational Attainment by Race

Name Total High School Bachelors
White8,0687,6632,762
Multiple Races24824765
Hispanic14012759
Native American7149
Black262626
Other Race111111
Asian661

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 black people with a rate of 100.00%.

Name Average Male Female
Overall$39,433$48,237$30,564
Less Than High School$$$
High School Grad$31,473$39,719$21,250
Some College$40,023$47,604$27,480
Bachelors Degree$40,026$52,250$36,250
Graduate Degree$74,050$97,593$66,146

$39,433

Average Earnings

$48,237

Average Male

$30,564

Average Female

Jefferson County, Montana Language

Jefferson County, Montana Language by Age

Jefferson County, Montana Language

98.27% of Jefferson County, Montana residents speak only English, while 1.73% speak other languages. The non-English language spoken by the largest group is Other Indo-European, which is spoken by 0.94% of the population.

Jefferson County, Montana Poverty

Jefferson County, Montana Poverty by Race

Name Total In Poverty Poverty Rate
White10,8228988.30%
Hispanic2737326.74%
Multiple4054210.37%
Native9755.15%

8.76%

Overall Poverty Rate

7.77%

Male Poverty Rate

9.80%

Female Poverty Rate

Poverty in Jefferson County, Montana

The race most likely to be in poverty in Jefferson County, Montana is Hispanic, with 26.74% below the poverty level.

The race least likely to be in poverty in Jefferson County, Montana is Native, with 5.15% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 3.30%. Among those working part-time, it was 9.11%, and for those that did not work, the poverty rate was 14.01%.

Name Poverty
Less Than High School18.47%
High School12.86%
Some College4.73%
Bachelors or Greater4.28%

Jefferson County, Montana Income

Jefferson County, Montana Income by Household Type

Name Median Mean
Households$66,867$81,384
Families$80,571$92,725
Married Families$85,743-
Non Families$35,542$47,113

Jefferson County, Montana Marital Status

Jefferson County, Montana Marital Status

Marriage Rates

58.5%

Overall Marriage Rate

57.7%

Male Marriage Rate

59.4%

Female Marriage Rate

Jefferson County, Montana Married by Age and Sex

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

Jefferson County, Montana Veterans

1,186

Number of Veterans

1,057

Male Veterans

129

Female Veterans

War Veterans
Vietnam605
First Gulf War278
Second Gulf War129
Korea98
World War II15

Jefferson County, Montana Veterans by Race

Name Veterans % of Total
White1,09712.35%
2 or More6824.82%
Indian2129.17%

Jefferson County, Montana Veterans by Education

3.61%

Veteran Poverty Rate

33.48%

Veteran Disability Rate

Jefferson County, Montana Employment Status

58.8%

Labor Force Participation

55.6%

Employment Rate

4.8%

Unemployment Rate

Jefferson County, Montana Place of Birth

Origin of Non Citizens

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

Origin of Naturalized Citizens

53.97%

Born in Montana

99.40%

Native Born

0.60%

Foreign Born

0.27%

Non Citizen

Place of Birth

99.40% of Jefferson County, Montana residents were born in the United States, with 53.97% having been born in Montana. 0.27% of residents are not US citizens. Of those not born in the United States, the largest percentage are from North America.

Population of Cities in Jefferson County, Montana

City 2010 Census 2016 Estimated Growth Growth Rate
Boulder11791230514.33%
Whitehall10441114706.70%
  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