Johnson County's estimated 2025 population is 628,529 with a growth rate of 0.5% in the past year according to the most recent United States census data. Johnson County is the 1st largest county in Kansas. The 2010 population was 545,681 and has seen a growth of 15.18% since that time.
Data after 2023 is projected based on recent change
The racial composition of Johnson County includes 80.19% White, 5.16% Asian, 4.88% Black or African American, and smaller percentages for other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White
Two or more races
Asian
Black or African American
Other race
Native American
Native Hawaiian or Pacific Islander
Race | Population | Percentage (of total) |
|---|---|---|
| White | 492,994 | 80.19% |
| Two or more races | 45,547 | 7.41% |
| Asian | 31,734 | 5.16% |
| Black or African American | 29,984 | 4.88% |
| Other race | 12,631 | 2.05% |
| Native American | 1,643 | 0.27% |
| Native Hawaiian or Pacific Islander | 231 | 0.04% |
Married
Widowed
Divorced
Separated
Never Married
Johnson County's average per capita income is $65,479. Household income levels show a median of $107,261. The poverty rate stands at 5.33%.
Name | Median | Mean |
|---|---|---|
| Married Families | $148,347 | $187,413 |
| Families | $131,831 | $171,138 |
| Households | $107,261 | $142,699 |
| Non Families | $62,359 | $81,993 |
Average Income
Median Household Income
Poverty Rate
