How many people live in Jerome County, ID?
Refreshed annually
In 2025, there were about 26,400 people living in Jerome County, ID. That makes Jerome County the 16th-most populous county in Idaho. It is home to 1.3% of people living in the state.
26.4K
population of Jerome County, ID (2025)
1.3%
County share of the Idaho population (2025)
About 26,400 people lived in Jerome County, ID in 2025.
Population estimates, 2000–2025
What are Jerome County, ID's age demographics?
About 3,700 Jerome County residents are aged 65 and older in 2024. That represents 14.1% of its population. For comparison, the age group represents 17.7% of Idaho’s population and 18% in the US overall.
Another 7,500 Jerome County, ID residents, or 28.9% 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 higher share of Jerome County, ID's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Jerome County, ID's racial and ethnic demographics?
Hispanic residents make up 40.9% of the Jerome County, ID population, higher than the national share of 20%.
In contrast, Jerome County’s non-Hispanic Black or African American population accounts for 0.42%, below the 12.6% nationwide, and the non-Hispanic Asian population makes up 0.37% of the county, compared with 6.5% 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.
Jerome County, ID has a higher share of a Hispanic population than Idaho as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Jerome County, ID is Jerome with about 13,500 residents in 2024.
Cities and towns in Jerome County, ID ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Jerome | 13,481 |
| 2. | Hazelton | 828 |
| 3. | Eden | 406 |
| 4. | Balance of Jerome County | 11,341 |
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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.
