Marion County's 2026 population is estimated at 11,474, reflecting a -0.85% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Marion County is the 37th largest county in Kansas. The 2010 population was 12,671 and has grown -9.45% since 2010.
Data after 2023 is projected based on recent change
Overall: 43.5 years
Female: 44.7 years
Male: 42.4 years
There are 9,278 adults, (2,784 of whom are seniors) in Marion County.
Female: 5,800 (49.3%)
Male: 5,954 (50.7%)
The racial composition of Marion County includes 92.67% White, and smaller percentages for Black or African American, other race, Native American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 10,893 | 92.67% |
| Two or more races | 538 | 4.58% |
| Black or African American | 113 | 0.96% |
| Other race | 89 | 0.76% |
| Native American | 65 | 0.55% |
| Asian | 54 | 0.46% |
| Native Hawaiian or Pacific Islander | 2 | 0.02% |
Marion County 's average per capita income is $43,509. Household income levels show a median of $64,695. The poverty rate stands at 9.15%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $86,558 | - |
| Families | $80,684 | $96,440 |
| Households | $64,695 | $86,234 |
| Non Families | $36,788 | $66,002 |
Average Income
Median Household Income
Poverty Rate
