Johnson County's estimated 2026 population is 642,980 with a growth rate of 0.95% 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 17.83% since that time.
Data after 2023 is projected based on recent change
Overall: 38.6 years
Female: 39.4 years
Male: 37.7 years
There are 474,880 adults, (99,005 of whom are seniors) in Johnson County.
Female: 313,839 (50.6%)
Male: 306,792 (49.4%)
The racial composition of Johnson County includes 78.52% White, 5.22% Asian, 4.95% Black or African American, and smaller percentages for other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 487,296 | 78.52% |
| Two or more races | 54,315 | 8.75% |
| Asian | 32,405 | 5.22% |
| Black or African American | 30,711 | 4.95% |
| Other race | 13,790 | 2.22% |
| Native American | 1,940 | 0.31% |
| Native Hawaiian or Pacific Islander | 174 | 0.03% |
Johnson County's average per capita income is $67,570. Household income levels show a median of $109,208. The poverty rate stands at 5.41%.
Name | Median | Mean |
|---|---|---|
| Married Families | $153,255 | $192,616 |
| Families | $136,798 | $176,517 |
| Households | $109,208 | $146,136 |
| Non Families | $62,249 | $82,943 |
Average Income
Median Household Income
Poverty Rate
