How many people live in Johnson County, IA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 160,100 people living in Johnson County, IA. That makes Johnson County the fourth-most populous county in Iowa. It is home to 4.9% of people living in the state.
160K
population of Johnson County, IA (2024)
4.9%
County share of the Iowa population (2024)
About 160,100 people lived in Johnson County, IA in 2024.
Population estimates, 2000–2024
What are Johnson County, IA’s age demographics?
About 22,800 Johnson County, IA residents are aged 65 and older in 2024. That represents 14.2% of its population. For comparison, the age group represents 18.9% of Iowa’s population and 18% in the US overall.
Another 30,200 Johnson County residents, or 18.9% of the population, were children under 18. For comparison, the age group represents 22.5% of Iowa’s population and 21.6% in the US overall.
A higher share of Johnson County, IA's population is aged 18–24 than the US as a whole.
Population estimates by age group, (2024)
What are Johnson County, IA’s racial and ethnic demographics?
Non-Hispanic white residents make up 75% of the Johnson County, IA population, higher than the national share of 57.5%. Johnson County, IA also has a larger share of people identifying as non-Hispanic two or more races (2.6%) than the US overall (2.5%).
In contrast, Johnson County’s Hispanic population accounts for 6.9%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 8.9% of the county, compared with 12.6% 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.
Johnson County, IA has a higher share of a non-Hispanic Black or African American population than Iowa as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Johnson County, IA is Iowa City with about 76,700 residents in 2024.
Cities and towns in Johnson County, IA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Iowa City | 76,710 |
| 2. | Coralville | 23,959 |
| 3. | North Liberty | 21,904 |
| 4. | Tiffin | 6,695 |
| 5. | Solon | 3,284 |
| 6. | Lone Tree | 1,341 |
| 7. | University Heights | 1,188 |
| 8. | Hills | 911 |
| 9. | Swisher | 909 |
| 10. | Shueyville | 725 |
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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.
