Johnson County's 2026 population is estimated at 57,426, reflecting a 1.36% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Johnson County is the 20th largest county in Missouri. The 2010 population was 52,689 and has grown 8.99% since 2010.
Data after 2023 is projected based on recent change
Overall: 31.5 years
Female: 32.7 years
Male: 30.7 years
There are 42,624 adults, (7,196 of whom are seniors) in Johnson County.
Female: 26,764 (48.9%)
Male: 27,968 (51.1%)
The racial composition of Johnson County includes 85.34% White, 4.35% Black or African American, and smaller percentages for Asian, other race, Native Hawaiian or Pacific Islander, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 46,706 | 85.34% |
| Two or more races | 3,731 | 6.82% |
| Black or African American | 2,380 | 4.35% |
| Asian | 830 | 1.52% |
| Other race | 741 | 1.35% |
| Native Hawaiian or Pacific Islander | 199 | 0.36% |
| Native American | 145 | 0.26% |
Johnson County 's average per capita income is $46,476. Household income levels show a median of $67,272. The poverty rate stands at 11.81%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $94,849 | $110,855 |
| Families | $86,789 | $101,442 |
| Households | $67,272 | $83,022 |
| Non Families | $43,712 | $50,992 |
Average Income
Median Household Income
Poverty Rate