Marion County's 2026 population is estimated at 28,651, reflecting a 0.4% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Marion County is the 38th largest county in Missouri. The 2010 population was 28,785 and has grown -0.47% since 2010.
Data after 2023 is projected based on recent change
Overall: 39.6 years
Female: 40.4 years
Male: 38.3 years
There are 21,623 adults, (5,406 of whom are seniors) in Marion County.
Female: 14,628 (51.4%)
Male: 13,829 (48.6%)
The racial composition of Marion County includes 89.15% White, 4.19% Black or African American, and smaller percentages for Asian, other race, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 25,370 | 89.15% |
| Two or more races | 1,449 | 5.09% |
| Black or African American | 1,192 | 4.19% |
| Asian | 228 | 0.8% |
| Other race | 150 | 0.53% |
| Native American | 68 | 0.24% |
Marion County 's average per capita income is $44,661. Household income levels show a median of $62,903. The poverty rate stands at 14.21%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $94,564 | - |
| Families | $76,314 | $90,600 |
| Households | $62,903 | $75,181 |
| Non Families | $31,806 | $40,168 |
Average Income
Median Household Income
Poverty Rate
