Johnson County's estimated 2026 population is 161,225 with a growth rate of 0.74% 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 22.75% since that time.
Data after 2023 is projected based on recent change
Overall: 31 years
Female: 31.5 years
Male: 30.6 years
There are 126,363 adults, (20,834 of whom are seniors) in Johnson County.
Female: 78,791 (50.3%)
Male: 77,848 (49.7%)
The racial composition of Johnson County includes 76.39% White, 7.7% Black or African American, 5.65% Asian, and smaller percentages for other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 119,654 | 76.39% |
| Two or more races | 12,096 | 7.72% |
| Black or African American | 12,059 | 7.7% |
| Asian | 8,849 | 5.65% |
| Other race | 3,677 | 2.35% |
| Native American | 273 | 0.17% |
| Native Hawaiian or Pacific Islander | 31 | 0.02% |
Johnson County's average per capita income is $54,856. Household income levels show a median of $74,935. The poverty rate stands at 17.07%.
Name | Median | Mean |
|---|---|---|
| Married Families | $133,357 | $171,866 |
| Families | $118,607 | $152,462 |
| Households | $74,935 | $108,874 |
| Non Families | $44,312 | $60,012 |
Average Income
Median Household Income
Poverty Rate
