Greene County's 2026 population is estimated at 11,107, reflecting a -1.38% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Greene County is the 85th largest county in Illinois. The 2010 population was 13,890 and has grown -20.04% since 2010.
Data after 2023 is projected based on recent change
Overall: 43.4 years
Female: 45.3 years
Male: 42.1 years
There are 9,108 adults, (2,434 of whom are seniors) in Greene County.
Female: 5,779 (49.5%)
Male: 5,904 (50.5%)
The racial composition of Greene County includes 95.85% White, and smaller percentages for Two or more races, Black or African American, Asian, other race, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 11,198 | 95.85% |
| Two or more races | 291 | 2.49% |
| Black or African American | 88 | 0.75% |
| Asian | 61 | 0.52% |
| Other race | 29 | 0.25% |
| Native American | 16 | 0.14% |
Greene County 's average per capita income is $41,076. Household income levels show a median of $62,192. The poverty rate stands at 14.26%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $95,756 | - |
| Families | $81,221 | $99,315 |
| Households | $62,192 | $84,051 |
| Non Families | $31,586 | $49,249 |
Average Income
Median Household Income
Poverty Rate