Overview
18,692
Total Population
44.7
Median age
49.58%
Female population %
101.7:100
Gender ratio (M:F)
60-64 years
Largest age group
67.8
Total dependency ratio
White
Largest racial group
1,647
Hispanic population
Sources: U.S. Census Bureau, American Community Survey (ACS) 2021
TABLE OF CONTENTS
Age
Gem County's population is old compared to the rest of the country:
- The median age in Gem County is 44.7, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
- Gem County's population under 18 was 22.86%, compared to the 22.51% nationwide.
- Gem County's elderly or the senior population (over 65 age) was 21.47% as compared to 16.04% nationwide.
- Of the total population in Gem County, 18.95% were under the age of 15, 15.74% aged 15 to 29, 43.84% aged 30 to 64, 20.32% aged 65 to 84, and 1.14% were 85 years of age and older.

Read more about Gem County, ID population by age ➔
Gender
There are 158 less females than males in Gem County:
- The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 49.58% females and 50.42% males in Gem County, ID.
- The Gem County, ID gender ratio is 101.7:100 i.e. 101.7 men to 100 women (1.017).
- For male population, the largest age group is 60-64 years with a population of 917.
- For the female population, the largest age group is 60-64 years with a population of 949.

Read more about Gem County, ID population by gender ➔
Race / Ethnicity
Gem County's population has become increasingly diverse:
- Racial distribution of Gem County population: 86.10% are White, 0.10% are Black or African American, 0.73% are American Indian and Alaska Native, 0.37% are Asian, 5.15% are some other race and 7.55% are multiracial.
- Gem County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
- By ethnicity, 1,647 is Hispanic or Latino (of any race), and 17,045 (91.19% of the total population) is Non-Hispanic.
- The largest racial group in Gem County is White with a population of 16,094 (86.10% of the total population).

Read more about Gem County, ID population by race ➔
Year by year
Gem County's population has not reached its peak yet and is showing a trend of further growth:
- The peak population was 20,418 in the year 2022
- From 2000 to 2010, Gem County's population increased by 1,483 (9.75%), as compared to the national growth of 9.63%.
- From 2010 to 2020, Gem County's population increased by 2,588 (15.51%), 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, Gem County's population was lowest in year 2000 at 15,203.

Read more about Gem County, ID population by year ➔
References
- U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates
- U.S. Census Bureau Population Estimates Population Estimates Program (PEP)