Johnson County's estimated 2025 population is 639,108 with a growth rate of 1.08% in the past year according to the most recent United States census data. Johnson County is the largest county in Kansas. The 2010 population was 545,681 and has seen a growth of 17.12% 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 (80.19%)
Two or more races (7.41%)
Asian (5.16%)
Black or African American (4.88%)
Other race (2.05%)
Native American (0.27%)
Native Hawaiian or Pacific Islander (0.04%)
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
