Marion County's 2026 population is estimated at 65,272, reflecting a 0.23% 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 Ohio. The 2010 population was 66,459 and has grown -1.79% since 2010.
Data after 2023 is projected based on recent change
Overall: 40.1 years
Female: 41 years
Male: 39.6 years
There are 51,156 adults, (12,140 of whom are seniors) in Marion County.
Female: 30,014 (46.2%)
Male: 35,006 (53.8%)
The racial composition of Marion County includes 87.03% White, 4.91% Black or African American, and smaller percentages for other race, Asian, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 56,588 | 87.03% |
| Two or more races | 3,771 | 5.8% |
| Black or African American | 3,195 | 4.91% |
| Other race | 925 | 1.42% |
| Asian | 395 | 0.61% |
| Native American | 146 | 0.22% |
Marion County 's average per capita income is $45,148. Household income levels show a median of $59,371. The poverty rate stands at 16.65%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $94,237 | $111,498 |
| Families | $76,382 | $93,191 |
| Households | $59,371 | $76,923 |
| Non Families | $33,859 | $47,958 |
Average Income
Median Household Income
Poverty Rate
