McDonough County's 2026 population is estimated at 26,082, reflecting a -1.1% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). McDonough County is the 51st largest county in Illinois. The 2010 population was 32,631 and has grown -20.07% since 2010.
Data after 2023 is projected based on recent change
Overall: 34.9 years
Female: 35.7 years
Male: 33.6 years
There are 22,070 adults, (5,199 of whom are seniors) in McDonough County.
Female: 13,690 (50.9%)
Male: 13,230 (49.1%)
The racial composition of McDonough County includes 86.35% White, 5.8% Black or African American, and smaller percentages for Asian, other race, Native Hawaiian or Pacific Islander, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 23,246 | 86.35% |
| Black or African American | 1,562 | 5.8% |
| Two or more races | 1,269 | 4.71% |
| Asian | 566 | 2.1% |
| Other race | 236 | 0.88% |
| Native Hawaiian or Pacific Islander | 24 | 0.09% |
| Native American | 17 | 0.06% |
McDonough County 's average per capita income is $45,243. Household income levels show a median of $52,795. The poverty rate stands at 17.2%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $94,600 | - |
| Families | $80,503 | $100,183 |
| Households | $52,795 | $71,521 |
| Non Families | $32,239 | $42,953 |
Average Income
Median Household Income
Poverty Rate
