Cass County's 2026 population is estimated at 12,581, reflecting a -0.52% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Cass County is the 80th largest county in Illinois. The 2010 population was 13,632 and has grown -7.71% since 2010.
Data after 2023 is projected based on recent change
Overall: 38.3 years
Female: 38.5 years
Male: 38.2 years
There are 9,665 adults, (2,307 of whom are seniors) in Cass County.
Female: 6,554 (51.3%)
Male: 6,230 (48.7%)
The racial composition of Cass County includes 74.8% White, 9.36% other race, 3.97% Black or African American, and smaller percentages for Native American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 9,562 | 74.8% |
| Two or more races | 1,203 | 9.41% |
| Other race | 1,196 | 9.36% |
| Black or African American | 508 | 3.97% |
| Native American | 128 | 1% |
| Asian | 117 | 0.92% |
| Native Hawaiian or Pacific Islander | 70 | 0.55% |
Cass County 's average per capita income is $46,899. Household income levels show a median of $68,125. The poverty rate stands at 11.09%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $88,042 | - |
| Families | $79,133 | $94,109 |
| Households | $68,125 | $81,028 |
| Non Families | $37,050 | $48,711 |
Average Income
Median Household Income
Poverty Rate
