Massac County's 2026 population is estimated at 13,379, reflecting a -0.92% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Massac County is the 77th largest county in Illinois. The 2010 population was 15,380 and has grown -13.01% since 2010.
Data after 2023 is projected based on recent change
Overall: 44.7 years
Female: 46.5 years
Male: 43.9 years
There are 10,910 adults, (3,049 of whom are seniors) in Massac County.
Female: 7,110 (51.3%)
Male: 6,755 (48.7%)
The racial composition of Massac County includes 86.33% White, 6.74% Black or African American, and smaller percentages for other race, Asian, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 11,970 | 86.33% |
| Black or African American | 934 | 6.74% |
| Two or more races | 859 | 6.2% |
| Other race | 46 | 0.33% |
| Asian | 39 | 0.28% |
| Native American | 17 | 0.12% |
Massac County 's average per capita income is $41,844. Household income levels show a median of $65,116. The poverty rate stands at 16.27%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $93,703 | - |
| Families | $80,074 | $91,292 |
| Households | $65,116 | $75,960 |
| Non Families | $30,840 | $46,204 |
Average Income
Median Household Income
Poverty Rate