Overview
          592
                  Total Population
                40.8
                  Median age
                46.96%
                  Female population %
                112.9:100
                  Gender ratio (M:F)
                5-9 years
                  Largest age group
                72.1
                  Total dependency ratio
                White
                  Largest racial group
                17
                  Hispanic population
                Sources: U.S. Census Bureau, American Community Survey (ACS) 2021
TABLE OF CONTENTS
Age
Joliet's population is old compared to the rest of the country:
- The median age in Joliet is 40.8, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
 - Joliet's population under 18 was 21.62%, compared to the 22.51% nationwide.
 - Joliet's elderly or the senior population (over 65 age) was 24.32% as compared to 16.04% nationwide.
 - Of the total population in Joliet, 17.57% were under the age of 15, 16.72% aged 15 to 29, 41.39% aged 30 to 64, 21.45% aged 65 to 84, and 2.87% were 85 years of age and older.
 
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Gender
There are 36 less females than males in Joliet:
- The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 46.96% females and 53.04% males in Joliet, MT.
 - The Joliet, MT gender ratio is 112.9:100 i.e. 112.9 men to 100 women (1.129).
 - For male population, the largest age group is 15-19 years with a population of 36.
 - For the female population, the largest age group is 5-9 years with a population of 39.
 
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Race / Ethnicity
Joliet's population is moderately diverse:
- Racial distribution of Joliet population: 96.45% are White, 1.18% are American Indian and Alaska Native and 2.36% are multiracial.
 - Joliet's racial breakdown clearly shows that there is an absolute majority of White population in the town.
 - By ethnicity, 17 is Hispanic or Latino (of any race), and 575 (97.13% of the total population) is Non-Hispanic.
 - The largest racial group in Joliet is White with a population of 571 (96.45% of the total population).
 
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Year by year
Joliet's population has already reached its peak and is showing a trend of decline:
- The peak population was 655 in the year 2017
 - From 2000 to 2010, Joliet's population increased by 4 (0.69%), as compared to the national growth of 9.63%.
 - From 2010 to 2020, Joliet's population decreased by 4 (0.68%), 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, Joliet's population was lowest in year 2000 at 580.
 
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References
- U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates
 - U.S. Census Bureau Population Estimates Population Estimates Program (PEP)