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.
White
Black or African American
Two or more races
Asian
Other race
Native American
Native Hawaiian or Pacific Islander
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
