How many people live in Gem County, ID?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 21,900 people living in Gem County, ID. That makes Gem County the 19th-most populous county in Idaho. It is home to 1.1% of people living in the state.
21.9K
population of Gem County, ID (2024)
1.1%
County share of the Idaho population (2024)
About 21,900 people lived in Gem County, ID in 2024.
Population estimates, 2000–2024
What are Gem County, ID’s age demographics?
About 5,100 Gem County residents are aged 65 and older in 2024. That represents 23.5% of its population. For comparison, the age group represents 17.7% of Idaho’s population and 18% in the US overall.
Another 4,700 Gem County residents, or 21.6% of the population, were children under 18. For comparison, the age group represents 23.4% of Idaho’s population and 21.6% in the US overall.
A lower share of Gem County, ID's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Gem County, ID’s racial and ethnic demographics?
Non-Hispanic white residents make up 85.1% of the Gem County, ID population, higher than the national share of 57.5%. Gem County, ID also has a larger share of people identifying as non-Hispanic American Indian and Alaska Native (0.77%) than the US overall (0.72%).
In contrast, Gem County’s non-Hispanic Black or African American population accounts for 0.34%, below the 12.6% nationwide, and the Hispanic population makes up 10.4% of the county, compared with 20% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Gem County, ID has a higher share of a non-Hispanic white population than Idaho as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Gem County, ID is Emmett with about 8,800 residents in 2024.
Cities and towns in Gem County, ID ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Emmett | 8,803 |
| 2. | Balance of Gem County | 13,054 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
