Johnson County's estimated 2025 population is 158,754 with a growth rate of 0.39% in the past year according to the most recent United States census data. Johnson County is the 4th largest county in Iowa. The 2010 population was 131,344 and has seen a growth of 20.87% since that time.
Data after 2023 is projected based on recent change
The racial composition of Johnson County includes 77.63% White, 7.55% Black or African American, 5.82% Asian, and smaller percentages for other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 120,233 | 77.63% |
| Black or African American | 11,695 | 7.55% |
| Two or more races | 10,355 | 6.69% |
| Asian | 9,018 | 5.82% |
| Other race | 3,264 | 2.11% |
| Native American | 267 | 0.17% |
| Native Hawaiian or Pacific Islander | 49 | 0.03% |
Married
Widowed
Divorced
Separated
Never Married
Johnson County's average per capita income is $54,091. Household income levels show a median of $74,721. The poverty rate stands at 16.74%.
Name | Median | Mean |
|---|---|---|
| Married Families | $130,469 | $167,093 |
| Families | $115,914 | $149,065 |
| Households | $74,721 | $108,967 |
| Non Families | $43,147 | $62,283 |
Average Income
Median Household Income
Poverty Rate
