Marion County's 2026 population is estimated at 358,853, reflecting a 0.84% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Marion County is the 5th largest county in Oregon. The 2010 population was 315,948 and has grown 13.58% since 2010.
Data after 2023 is projected based on recent change
Overall: 37.5 years
Female: 38.5 years
Male: 36.5 years
There are 267,048 adults, (58,378 of whom are seniors) in Marion County.
Female: 173,830 (49.8%)
Male: 175,414 (50.2%)
The racial composition of Marion County includes 66.25% White, 11.06% other race, and smaller percentages for Asian, Native American, Black or African American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 231,379 | 66.25% |
| Two or more races | 59,819 | 17.13% |
| Other race | 38,637 | 11.06% |
| Asian | 7,059 | 2.02% |
| Native American | 4,297 | 1.23% |
| Black or African American | 4,236 | 1.21% |
| Native Hawaiian or Pacific Islander | 3,817 | 1.09% |
Marion County 's average per capita income is $47,462. Household income levels show a median of $77,351. The poverty rate stands at 13.03%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $108,721 | $133,341 |
| Families | $91,259 | $115,699 |
| Households | $77,351 | $100,449 |
| Non Families | $48,228 | $61,565 |
Average Income
Median Household Income
Poverty Rate
