Boulder, Montana Population 2021

1,298
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Boulder is a city located in Jefferson County Montana. It is also the county seat of Jefferson County. With a 2020 population of 1,298, it is the 50th largest city in Montana and the 9252nd largest city in the United States . Boulder is currently growing at a rate of 0.85% annually and its population has increased by 9.72% since the most recent census, which recorded a population of 1,183 in 2010. Boulder reached it's highest population of 1,298 in 2021. Spanning over 1 miles, Boulder has a population density of 1,155 people per square mile.

The average household income in Boulder is $52,567 with a poverty rate of 20.64%. The median rental costs in recent years comes to $612 per month, and the median house value is $139,100. The median age in Boulder is 49 years, 49.2 years for males, and 47.3 years for females.

Boulder Demographics

According to the most recent ACS, the racial composition of Boulder was:

  • White: 93.10%
  • Native American: 3.68%
  • Two or more races: 3.22%
  • Black or African American: 0.00%
  • Asian: 0.00%
  • Native Hawaiian or Pacific Islander: 0.00%
  • Other race: 0.00%
The current population of Boulder, Montana is 1,298 based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 1,265.The last official US Census in 2010 recorded the population at 1,183.

Boulder, Montana Population 2021

Population by Race

Race Population Percentage
White80993.10%
American Indian and Alaska Native323.68%
Two or More Races283.22%
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Boulder Population by Race

Boulder Population Pyramid $2021

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Boulder Median Age

49


Total

49.2


Male

47.3


Female

Boulder Adults

There are 729 adults, (180 of whom are seniors) in Boulder.

Boulder Age Dependency

58.3

Age Dependency Ratio

32.8

Old Age Dependency Ratio

25.5

Child Dependency Ratio

Boulder Sex Ratio

Female

394

45.34%

Male

475

54.66%

Boulder Population by Age

Boulder Renter vs Owner Occupied by Household Type

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Boulder Household Types

Type Owner Renter
Married77.3%22.7%
All61.3%38.7%
Male57.1%42.9%
Non Family50.4%49.6%
Female36.1%63.9%

61.3%

Rate of Home Ownership

Boulder Households and Families

Type Count Average Size Owned
All3312.2661.3
Married1502.8877.3
Non Family1311.1750.4
Female363.3936.1
Male14357.1

2.91

Average Family Size

2.26

Average Household Size

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Boulder Households by Type

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Education Attained Count Percentage
Less Than 9th Grade131.98%
9th to 12th Grade10115.42%
High School Graduate27642.14%
Some College11717.86%
Associates Degree345.19%
Bachelors Degree9814.96%
Graduate Degree162.44%
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Boulder Educational Attainment by Sex (over 25)

Boulder Educational Attainment by Race

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Race Total High School Bachelors
White582484114
Native American2816
2+ Races2828
Hispanic1713

The highest rate of high school graduation is among 2+ races people with a rate of 100.00%.

The highest rate of bachelors degrees is among white people with a rate of 19.59%.

Boulder Educational Attainment by Race

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Name Average Male Female
Overall$22,118$22,500$21,845
Less Than 9th Grade$2,500$$
High School Graduate$21,211$21,250$21,176
Some College$26,667$33,375$20,313
Bachelors Degree$48,068$$48,636
Graduate Degree$$$

$22,118

Average Earnings

$22,500

Average Male

$21,845

Average Female

Boulder Earnings by Educational Attainment

Boulder Language by Age

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Boulder Language

99.53% of Boulder residents speak only English, while 0.47% speak other languages. The non-English language spoken by the largest group is Other languages, which is spoken by 0.47% of the population.

Boulder Language

Boulder Poverty by Race

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Name Total In Poverty Poverty Rate
White73916822.73%
Hispanic6546.15%
Native16318.75%

20.64%

Overall Poverty Rate

21.37%

Male Poverty Rate

19.80%

Female Poverty Rate

Poverty in Boulder

The race most likely to be in poverty in Boulder is White, with 22.73% below the poverty level.

The race least likely to be in poverty in Boulder is Hispanic, with 6.15% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 8.60%. Among those working part-time, it was 24.46%, and for those that did not work, the poverty rate was 27.55%.

Boulder Poverty

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Name Poverty
Bachelors or Greater28.07%
High School21.01%
Less Than 9th Grade16.67%
Some College13.70%

Boulder Poverty Rate by Education

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Rate Poverty
Female Unemployed100.00%
Female Employed10.56%
Male Unemployed0.00%
Male Employed21.19%

Boulder Poverty Rate by Employment Status and Sex

Boulder Income by Household Type

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Name Median Mean
Households$42,454$52,567
Families$50,625$57,682
Married Families$53,864-
Non Families$37,375$39,653
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Income by Household Type

Boulder Marital Status

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Marriage Rates

43.2%

Overall Marriage Rate

39.0%

Male Marriage Rate

49.5%

Female Marriage Rate

Boulder Married by Age and Sex

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Boulder Marriage

The age group where males are most likely to be married is 45-54, while the female age group most likely to be married is 55-64.

Boulder Marital Status by Race

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Boulder Marital Status

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114

Number of Veterans

110

Male Veterans

4

Female Veterans

War Veterans
Vietnam61
First Gulf War35
Korea16
World War II
Second Gulf War

Boulder Veterans by War

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Age Group Veterans
65 to 7464
75+20
55 to 6416
35 to 5414
18 to 34

Boulder Veterans by Age

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Name Veterans % of Total
White10215.25%
2+ Races1242.86%

Boulder Veterans by Race

Boulder Veterans by Education

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2.63%

Veteran Poverty Rate

49.12%

Veteran Disability Rate

Boulder Veterans by Education

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54.9%

Labor Force Participation

53.6%

Employment Rate

2.2%

Unemployment Rate

Boulder Employment by Age

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Boulder Employment by Race

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Boulder 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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60.99%

Born in Boulder

99.54%

Native Born

0.46%

Foreign Born

0.46%

Non Citizen

0.00%

Naturalized

Place of Birth

99.54% of Boulder residents were born in the United States, with 60.99% having been born in Montana. 0.46% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Boulder Place of Birth

Year Population Growth Annual Growth Rate
20211,298110.85%
20201,287110.86%
20191,276110.87%
20181,265171.36%
20171,248120.97%
20161,236252.06%
20151,21190.75%
20141,20280.67%
20131,194151.27%
20121,17910.08%
20111,178-2-0.17%
20101,1800.00%

Boulder Population by Year