Marion County's estimated 2026 population is 36,263 with a growth rate of -0.33% in the past year according to the most recent United States census data. Marion County is the 37th largest county in Illinois. The 2010 population was 39,416 and has seen a growth of -8% since that time.
Data after 2023 is projected based on recent change
Overall: 41.5 years
Female: 42.5 years
Male: 40.5 years
There are 28,315 adults, (7,473 of whom are seniors) in Marion County.
Female: 18,791 (50.8%)
Male: 18,209 (49.2%)
The racial composition of Marion County includes 89.95% White, and smaller percentages for Black or African American, other race, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 33,280 | 89.95% |
| Two or more races | 1,827 | 4.94% |
| Black or African American | 1,097 | 2.96% |
| Other race | 487 | 1.32% |
| Asian | 270 | 0.73% |
| Native American | 38 | 0.1% |
| Native Hawaiian or Pacific Islander | 1 | 0% |
Marion County's average per capita income is $44,911. Household income levels show a median of $61,240. The poverty rate stands at 15.37%.
Name | Median | Mean |
|---|---|---|
| Married Families | $93,711 | $110,989 |
| Families | $77,328 | $94,619 |
| Households | $61,240 | $77,168 |
| Non Families | $36,548 | $46,149 |
Average Income
Median Household Income
Poverty Rate
