Yellowstone County, Montana Population 2021

Yellowstone County, Montana's estimated population is 163,842 with a growth rate of 0.78% in the past year according to the most recent United States census data. Yellowstone County, Montana is the 2nd largest county in Montana. The 2010 Population was 148,394 and has seen a growth of 10.41% since this time.

Note: 2020 and 2021 data is projected
Year Population Growth Growth Rate
2021163,8421,2710.78%
2020162,5711,2710.79%
2019161,3001,2710.79%
2018160,0297630.48%
2017159,2661,3520.86%
2016157,9141,3850.88%
2015156,5291,2500.81%
2014155,2791,5040.98%
2013153,7752,1401.41%
2012151,6351,8631.24%
2011149,7721,3780.93%
2010148,39434,97530.84%
1990113,4195,3844.98%
1980108,03520,66823.66%
197087,3678,35110.57%
196079,01623,14141.42%
195055,87514,69335.68%
194041,18210,39733.77%
193030,7851,1854.00%
192029,6006,65629.01%
191022,94416,732269.35%
19006,2124,147200.82%
18902,0650.00%
2021 Growth Rate
0.78%
County Website
State
Founded
February 26, 1883
County Seat
2010 Population
148,394
Growth (since 2010)
10.41%
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Yellowstone County, Montana Population Growth

Population by Race

Race Population Percentage
White143,43490.21%
American Indian and Alaska Native6,9664.38%
Two or More Races5,1353.23%
Black or African American1,1830.74%
Asian1,1100.70%
Some Other Race1,0440.66%
Native Hawaiian and Other Pacific Islander1360.09%
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Yellowstone County, Montana Population by Race

Yellowstone County, Montana Population Pyramid 2021

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Yellowstone County, Montana Median Age

38.4


Total

37.2


Male

39.4


Female

Yellowstone County, Montana Adults

There are 121,557 adults, (26,275 of whom are seniors) in Yellowstone County, Montana.

Yellowstone County, Montana Age Dependency

66.9

Age Dependency Ratio

27.6

Old Age Dependency Ratio

39.3

Child Dependency Ratio

Yellowstone County, Montana Sex Ratio

Female

80,660

50.73%

Male

78,348

49.27%

Yellowstone County, Montana Population by Age

Yellowstone County, Montana Renter vs Owner Occupied by Household Type

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Yellowstone County, Montana Household Types

Type Owner Renter
Married84%16%
All68.4%31.6%
Male58.8%41.2%
Non Family52.9%47.1%
Female52.7%47.3%

68.4%

Rate of Home Ownership

Yellowstone County, Montana Households and Families

Type Count Average Size Owned
All66,3852.3468.4
Married32,3943.0484
Non Family25,0381.2452.9
Female5,5702.952.7
Male3,3832.9458.8

2.93

Average Family Size

2.34

Average Household Size

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Yellowstone County, Montana Households by Type

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Education Attained Count Percentage
Less Than 9th Grade1,8031.66%
9th to 12th Grade4,5774.21%
High School Graduate32,85730.24%
Some College24,59222.63%
Associates Degree9,9989.20%
Bachelors Degree24,19522.27%
Graduate Degree10,6349.79%
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Yellowstone County, Montana Educational Attainment by Sex (over 25)

Yellowstone County, Montana Educational Attainment by Race

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Name Total High School Bachelors
White98,03893,01232,596
Hispanic4,1643,294659
Native American3,6753,315544
Multiple Races1,8031,738590
Asian872778359
Other Race756629149
Black705651215
Islander70708

The highest rate of high school graduation is among islander people with a rate of 100.00%.

The highest rate of bachelors degrees is among asian people with a rate of 41.17%.

Yellowstone County, Montana Educational Attainment by Race

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Name Average Male Female
Overall$39,721$48,654$31,569
Less Than High School$24,087$32,216$19,315
High School Grad$31,783$41,822$22,857
Some College$35,983$45,061$30,413
Bachelors Degree$50,542$61,273$40,980
Graduate Degree$59,815$78,278$53,480

$39,721

Average Earnings

$48,654

Average Male

$31,569

Average Female

Yellowstone County, Montana Earnings by Educational Attainment

Yellowstone County, Montana Language by Age

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Yellowstone County, Montana Language

96.08% of Yellowstone County, Montana residents speak only English, while 3.92% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 1.69% of the population.

Yellowstone County, Montana Language

Yellowstone County, Montana Poverty by Race

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Name Total In Poverty Poverty Rate
White134,36512,2659.13%
Native6,4711,21518.78%
Hispanic8,6781,12212.93%
Multiple5,05965212.89%
Black1,11313211.86%
Other90111612.87%
Asian1,087484.42%

9.79%

Overall Poverty Rate

8.79%

Male Poverty Rate

10.77%

Female Poverty Rate

Poverty in Yellowstone County, Montana

The race most likely to be in poverty in Yellowstone County, Montana is Native, with 18.78% below the poverty level.

The race least likely to be in poverty in Yellowstone County, Montana is Asian, with 4.42% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.39%. Among those working part-time, it was 13.41%, and for those that did not work, the poverty rate was 16.86%.

Yellowstone County, Montana Poverty

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Name Poverty
Less Than High School14.72%
High School12.30%
Some College7.90%
Bachelors or Greater4.19%

Yellowstone County, Montana Poverty Rate by Education

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Name Poverty
Female Unemployed27.33%
Male Unemployed20.87%
Female Employed6.38%
Male Employed4.06%

Yellowstone County, Montana Poverty Rate by Employment Status and Sex

Yellowstone County, Montana Income by Household Type

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Name Median Mean
Households$61,264$81,783
Families$77,466$99,869
Married Families$88,296$112,275
Non Families$36,627$48,906
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Income by Household Type

Yellowstone County, Montana Marital Status

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Marriage Rates

52.5%

Overall Marriage Rate

53.3%

Male Marriage Rate

51.8%

Female Marriage Rate

Yellowstone County, Montana Married by Age and Sex

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Yellowstone 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 35-44.

Yellowstone County, Montana Marital Status by Race

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Yellowstone County, Montana Marital Status

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11,655

Number of Veterans

10,506

Male Veterans

1,149

Female Veterans

War Veterans
Vietnam4,034
First Gulf War2,393
Second Gulf War2,134
Korea827
World War II475

Yellowstone County, Montana Veterans by War

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Age Group Veterans
65 to 742,971
35 to 542,890
75+2,456
55 to 642,227
18 to 341,111

Yellowstone County, Montana Veterans by Age

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Name Veterans % of Total
White10,8739.73%
Indian4239.57%
Hispanic3186.05%
2 or More1445.58%
Asian11111.88%
Other566.87%
Black485.39%

Yellowstone County, Montana Veterans by Race

Yellowstone County, Montana Veterans by Education

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7.45%

Veteran Poverty Rate

28.81%

Veteran Disability Rate

Yellowstone County, Montana Veterans by Education

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66.9%

Labor Force Participation

64.6%

Employment Rate

3.3%

Unemployment Rate

Yellowstone County, Montana Employment by Age

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Yellowstone County, Montana Employment by Race

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Yellowstone 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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57.95%

Born in Montana

97.90%

Native Born

2.10%

Foreign Born

0.87%

Non Citizen

1.23%

Naturalized

Place of Birth

97.90% of Yellowstone County, Montana residents were born in the United States, with 57.95% having been born in Montana. 0.87% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Yellowstone 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