Mercer County's estimated 2026 population is 15,166 with a growth rate of -0.41% in the past year according to the most recent United States census data. Mercer County is the 68th largest county in Illinois. The 2010 population was 16,410 and has seen a growth of -7.58% since that time.
Data after 2023 is projected based on recent change
Overall: 44.7 years
Female: 45.1 years
Male: 44.2 years
There are 12,265 adults, (3,389 of whom are seniors) in Mercer County.
Female: 7,665 (49.5%)
Male: 7,830 (50.5%)
The racial composition of Mercer County includes 94.15% White, and smaller percentages for other race, Black or African American, Asian, Native American and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 14,589 | 94.15% |
| Two or more races | 569 | 3.67% |
| Other race | 174 | 1.12% |
| Black or African American | 93 | 0.6% |
| Asian | 56 | 0.36% |
| Native American | 14 | 0.09% |
Mercer County's average per capita income is $49,390. Household income levels show a median of $74,182. The poverty rate stands at 8.92%.
Name | Median | Mean |
|---|---|---|
| Married Families | $102,819 | - |
| Families | $95,557 | $107,841 |
| Households | $74,182 | $92,846 |
| Non Families | $39,430 | $56,159 |
Average Income
Median Household Income
Poverty Rate
