Gallatin County, MT Population

The population of Gallatin County is 116,725, according to the U.S. Census Bureau ACS estimates.
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Updated Jun 23, 2023
Overview
116,725
Total Population
33.7
Median age
47.98%
Female population %
108.4:100
Gender ratio (M:F)
20-24 years
Largest age group
41.4
Total dependency ratio
White
Largest racial group
4,806
Hispanic population

Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

Age

Gallatin County's population is young compared to the rest of the country:

  • The median age in Gallatin County is 33.7, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
  • Gallatin County's population under 18 was 19.80%, compared to the 22.51% nationwide.
  • Gallatin County's elderly or the senior population (over 65 age) was 12.65% as compared to 16.04% nationwide.
  • Of the total population in Gallatin County, 16.64% were under the age of 15, 27.66% aged 15 to 29, 43.05% aged 30 to 64, 11.57% aged 65 to 84, and 1.08% were 85 years of age and older.
The graph shows Gallatin County's population by age group, with age group on x-axis and the respective age group's percent of the total population on y-axis
Gallatin County, MT population by age group. The largest age group was 20-24 years with a poulation of 14,172 (12.14% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Read more about Gallatin County, MT population by age ➔

Gender

There are 4,721 less females than males in Gallatin County:

  • The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 47.98% females and 52.02% males in Gallatin County, MT.
  • The Gallatin County, MT gender ratio is 108.4:100 i.e. 108.4 men to 100 women (1.084).
  • For male population, the largest age group is 20-24 years with a population of 8,001.
  • For the female population, the largest age group is 20-24 years with a population of 6,171.
The grouped bar chart shows Gallatin County, MT population by age and gender across 18 age groups, defined between the age of 0 and 85 and above. The female population is shown in pink color bar and male population is shown in blue color bar. Age group is plotted on x axis and population on y axis.
California population by gender and age. Largest age group (population): Male # 20-24 years (8,001) | Female # 20-24 years (6,171). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Read more about Gallatin County, MT population by gender ➔

Race / Ethnicity

Gallatin County's population has become increasingly diverse:

  • Racial distribution of Gallatin County population: 92.14% are White, 0.41% are Black or African American, 0.87% are American Indian and Alaska Native, 1.29% are Asian, 0% are Native Hawaiian and other Pacific Islander, 1.13% are some other race and 4.15% are multiracial.
  • Gallatin County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
  • By ethnicity, 4,806 is Hispanic or Latino (of any race), and 111,919 (95.88% of the total population) is Non-Hispanic.
  • The largest racial group in Gallatin County is White with a population of 107,549 (92.14% of the total population).
The bar chart shows Gallatin County, MT population by race, in percentage. The numbers shown are based on the American Community Survey respondents self identified race. The Hispanic and Latino population is spread across the races identified and not as a separate race category.
Gallatin County, MT population by race. The largest racial group in Gallatin County is White with a population of 107,549 (92.14% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Read more about Gallatin County, MT population by race ➔

Year by year

Gallatin County's population has not reached its peak yet and is showing a trend of further growth:

  • The peak population was 124,857 in the year 2022
  • From 2000 to 2010, Gallatin County's population increased by 21,256 (31.07%), as compared to the national growth of 9.63%.
  • From 2010 to 2020, Gallatin County's population increased by 29,923 (33.37%), according to Census Bureau's Population Estimates Program. For the same period, the rate of growth for the United States was 7.17%.
  • Between the year 2000 and 2022, Gallatin County's population was lowest in year 2000 at 68,406.
The graph shows Gallatin County's population from 2000 to 2022, with years on x-axis and population on y-axis
Gallatin County's population from 2000 to 2022. The estimated population at the end of 2022 was 124,857. Source: U.S. Census Bureau (Population Estimates Program)

Read more about Gallatin County, MT population by year ➔

References

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Gallatin County, MT Demographics

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