Marion County's estimated 2026 population is 36,031 with a growth rate of -0.56% 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 -8.59% since that time.
Data after 2023 is projected based on recent change
The racial composition of Marion County includes 90.4% White, 4.22% Black or African American, and smaller percentages for other race, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White (90.4%)
Black or African American (4.22%)
Two or more races (3.48%)
Other race (1.19%)
Asian (0.67%)
Native American (0.02%)
Native Hawaiian or Pacific Islander (0.02%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 33,714 | 90.4% |
| Black or African American | 1,572 | 4.22% |
| Two or more races | 1,299 | 3.48% |
| Other race | 444 | 1.19% |
| Asian | 251 | 0.67% |
| Native American | 7 | 0.02% |
| Native Hawaiian or Pacific Islander | 7 | 0.02% |
Married
Widowed
Divorced
Separated
Never Married
Marion County's average per capita income is $43,162. Household income levels show a median of $60,839. The poverty rate stands at 16.16%.
Name | Median | Mean |
|---|---|---|
| Married Families | $91,532 | $108,232 |
| Families | $77,817 | $94,248 |
| Households | $60,839 | $76,720 |
| Non Families | $34,793 | $45,135 |
Average Income
Median Household Income
Poverty Rate
