How many people live in Bonneville County, ID?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 133,600 people living in Bonneville County, ID. That makes Bonneville County the fourth-most populous county in Idaho. It is home to 6.6% of people living in the state.
134K
population of Bonneville County, ID (2024)
6.6%
County share of the Idaho population (2024)
About 133,600 people lived in Bonneville County, ID in 2024.
Population estimates, 2000–2024
What are Bonneville County, ID’s age demographics?
About 19,200 Bonneville County residents are aged 65 and older in 2024. That represents 14.4% of its population. For comparison, the age group represents 17.7% of Idaho’s population and 18% in the US overall.
Another 38,400 Bonneville County residents, or 28.7% 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 Bonneville County, ID's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Bonneville County, ID’s racial and ethnic demographics?
Non-Hispanic white residents make up 80.4% of the Bonneville County, ID population, higher than the national share of 57.5%.
In contrast, Bonneville County’s non-Hispanic Black or African American population accounts for 0.64%, below the 12.6% nationwide, and the non-Hispanic Asian population makes up 1.2% 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.
Bonneville 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 Bonneville County, ID is Idaho Falls with about 69,500 residents in 2024.
Cities and towns in Bonneville County, ID ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Idaho Falls | 69,523 |
| 2. | Ammon | 20,095 |
| 3. | Iona | 3,113 |
| 4. | Ucon | 1,218 |
| 5. | Swan Valley | 310 |
| 6. | Irwin | 289 |
| 7. | Ririe (pt.) | 72 |
| 8. | Balance of Bonneville County | 39,024 |
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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.
