Marshall County's 2026 population is estimated at 11,356, reflecting a -0.86% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Marshall County is the 84th largest county in Illinois. The 2010 population was 12,637 and has grown -10.14% since 2010.
Data after 2023 is projected based on recent change
Overall: 46.1 years
Female: 46.6 years
Male: 44.9 years
There are 9,269 adults, (2,800 of whom are seniors) in Marshall County.
Female: 5,817 (49.9%)
Male: 5,830 (50.1%)
The racial composition of Marshall County includes 92.83% White, and smaller percentages for other race, Black or African American, Native American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 10,812 | 92.83% |
| Two or more races | 570 | 4.89% |
| Other race | 193 | 1.66% |
| Black or African American | 47 | 0.4% |
| Native American | 13 | 0.11% |
| Asian | 10 | 0.09% |
| Native Hawaiian or Pacific Islander | 2 | 0.02% |
Marshall County 's average per capita income is $48,765. Household income levels show a median of $71,585. The poverty rate stands at 11.43%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $96,336 | - |
| Families | $89,890 | $99,457 |
| Households | $71,585 | $85,623 |
| Non Families | $36,365 | $52,659 |
Average Income
Median Household Income
Poverty Rate
