How many people live in Twin Falls County, ID?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 96,500 people living in Twin Falls County, ID. That makes Twin Falls County the fifth-most populous county in Idaho. It is home to 4.8% of people living in the state.
96.5K
population of Twin Falls County, ID (2024)
4.8%
County share of the Idaho population (2024)
About 96,500 people lived in Twin Falls County, ID in 2024.
Population estimates, 2000–2024
What are Twin Falls County, ID’s age demographics?
About 16,500 Twin Falls County residents are aged 65 and older in 2024. That represents 17.1% of its population. For comparison, the age group represents 17.7% of Idaho’s population and 18% in the US overall.
Another 24,600 Twin Falls County residents, or 25.5% 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 Twin Falls County, ID's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Twin Falls County, ID’s racial and ethnic demographics?
Non-Hispanic white residents make up 75.8% of the Twin Falls County population, higher than the national share of 57.5%. Twin Falls County also has a larger share of people identifying as non-Hispanic Native Hawaiian and other Pacific Islander (0.27%) than the US overall (0.2%).
In contrast, Twin Falls County’s non-Hispanic Black or African American population accounts for 1%, below the 12.6% nationwide, and the non-Hispanic Asian population makes up 1.5% 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.
Twin Falls 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 Twin Falls County, ID is Twin Falls with about 55,600 residents in 2024.
Cities and towns in Twin Falls County, ID ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Twin Falls | 55,589 |
| 2. | Kimberly | 5,592 |
| 3. | Buhl | 4,761 |
| 4. | Filer | 3,040 |
| 5. | Hansen | 1,118 |
| 6. | Hollister | 267 |
| 7. | Castleford | 226 |
| 8. | Murtaugh | 123 |
| 9. | Balance of Twin Falls County | 25,793 |
Keep exploring
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.
