Gallatin County, MT Population

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

TABLE OF CONTENTS

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.

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.

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).

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.