Get ready-to-use data, reports, analysis, and visualizations covering the demographics of Gem County, Idaho based on the current United States Census Bureau's 2023 American Community Survey (ACS) 5-Year Estimates.
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Gem County, Idaho Demographics: Sex by Age

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the total population of Gem County, Idaho is 19,854. The median age of the population in Gem County, Idaho is 42.8. The median age for males is 42.2 years, and for females, it is 43.9 years.
The age distribution of the population in Gem County, Idaho is as follows:
- Under 5 years: 5.26%
- 5–17 years (children): 17.10%
- 18–24 years (young adults): 7.35%
- 25–34 years: 10.61%
- 35–54 years: 22.64%
- 55–64 years: 14.30%
- 65 years and over (seniors): 22.73%
The total dependency ratio in Gem County, Idaho is 82.11%. The youth dependency ratio is 40.73%, and the old-age dependency ratio is 41.39%. In demographic terms, the dependency ratio measures the size of the population typically not in the labor force (children and older adults) relative to those of working age.
Gem County, Idaho Demographics: Population by Race & Ethnicity

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the breakdown of the population in Gem County, Idaho by race and ethnicity (racial demographics) is as follows:
- White: 84.01%
- Black/African American: 0.19%
- American Indian and Alaska Native: 0.39%
- Asian: 0.23%
- Native Hawaiian or Other Pacific Islander: 0.00%
- Some other race: 0.89%
- Two or more races: 4.97%
- Hispanic or Latino: 9.33%
The diversity index score in Gem County, Idaho is 28.3%, suggesting a low level of diversity.
Gem County, Idaho Demographics: Household Income

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the median household income in Gem County, Idaho over the past 12 months, adjusted for 2023 inflation, was $66,245.
The distribution of household income by income bracket in Gem County, Idaho is as follows:
- Less than $20,000: 10.56%
- $20,000–$34,999: 10.82%
- $35,000–$49,999: 12.61%
- $50,000–$74,999: 23.71%
- $75,000–$149,999: 28.46%
- $150,000 or more: 13.84%
Gem County, Idaho Demographics: Educational Attainment

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the breakdown of the total population of Gem County, Idaho, age 25 and older, by educational level is as follows:
- Less than high school graduate: 10.96%
- High school graduate (incl. equivalency): 32.59%
- Some college or associate's degree: 34.18%
- Bachelor's Degree: 17.32%
- Graduate or professional degree: 4.96%
In Gem County, Idaho, 22.28% of the population has a bachelor's degree or higher, while 89.04% are high school graduates or higher.
Gem County, Idaho Demographics: Health Insurance Coverage Status by Sex by Age

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the uninsured rate in Gem County, Idaho is 11.91%.
Rates of people in Gem County, Idaho lacking health insurance coverage, by age group and sex are as follows:
- Under 18: 10.56% of males and 10.21% of females are uninsured
- Ages 18–34: 12.58% of males and 7.47% of females are uninsured
- Ages 35–64: 16.38% of males and 22.83% of females are uninsured
- Ages 65 and older: 1.52% of males and 5.71% of females are uninsured
Gem County, Idaho Demographics: Nativity and Citizenship Status in the United States

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 96.86% of people living in Gem County, Idaho are U.S. citizens. This includes individuals born in the United States, Puerto Rico, or U.S. Island Areas, those born abroad to American parents, and those who became citizens through naturalization. 1.65% of the population obtained U.S. citizenship through the naturalization process. In Gem County, Idaho, 1.65% of the population are naturalized immigrants, who obtained U.S. citizenship through the immigration and naturalization process.
Gem County, Idaho Demographics: Means of Transportation to Work

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the means of transportation to work for the population of Gem County, Idaho are distributed as follows:
- Car, truck, or van: 83.93%
- Public transportation (excluding taxicab): 0.16%
- Bicycle: 0.97%
- Walked: 1.44%
- Taxicab, motorcycle, or other means: 0.90%
- Worked from home: 12.59%
Frequently Asked Questions
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the age breakdown of the population of Gem County, Idaho is as follows:
- Under 5: 5.26%
- Ages 5–17: 17.10%
- Ages 18–24: 7.35%
- Ages 25–34: 10.61%
- Ages 35–54: 22.64%
- Ages 55–64: 14.30%
- 65 or older: 22.73%
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the racial demographics of the population of Gem County, Idaho are as follows:
- White: 84.01%
- Black/African American: 0.19%
- American Indian and Alaska Native: 0.39%
- Asian: 0.23%
- Native Hawaiian or Other Pacific Islander: 0.00%
- Some other race: 0.89%
- Two or more races: 4.97%
- Hispanic or Latino: 9.33%
* Hispanic includes respondents of any race. Other categories are non-Hispanic.
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the distribution of household income in Gem County, Idaho by income bracket is as follows:
- Less than $20,000: 10.56%
- $20,000–$34,999: 10.82%
- $35,000–$49,999: 12.61%
- $50,000–$74,999: 23.71%
- $75,000–$149,999: 28.46%
- $150,000 or more: 13.84%
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the median household income in Gem County, Idaho in the past 12 months, in 2023 inflation-adjusted dollars, was $66,245.
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 84.01% of the population in Gem County, Idaho identifies as White alone (not Hispanic or Latino).
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 0.19% of the population in Gem County, Idaho identifies as Black or African American alone (not Hispanic or Latino).
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 11.91% of the population of Gem County, Idaho lacks health insurance coverage.
The detailed breakdown by age and sex is as follows:
- Under 18: 10.56% of males and 10.21% of females
- Ages 18–34: 12.58% of males and 7.47% of females
- Ages 35–64: 16.38% of males and 22.83% of females
- Ages 65 and over: 1.52% of males and 5.71% of females