Mercer County's estimated 2025 population is 15,395 with a growth rate of -0.3% 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 -6.19% since that time.
Data after 2023 is projected based on recent change
The racial composition of Mercer County includes 94.77% White, and smaller percentages for other race, Black or African American, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White
Two or more races
Other race
Black or African American
Asian
Native American
Native Hawaiian or Pacific Islander
Race | Population | Percentage (of total) |
|---|---|---|
| White | 14,802 | 94.77% |
| Two or more races | 526 | 3.37% |
| Other race | 137 | 0.88% |
| Black or African American | 88 | 0.56% |
| Asian | 52 | 0.33% |
| Native American | 14 | 0.09% |
| Native Hawaiian or Pacific Islander | 0 | 0% |
Married
Widowed
Divorced
Separated
Never Married
Mercer County's average per capita income is $46,580. Household income levels show a median of $71,710. The poverty rate stands at 7.88%.
Name | Median | Mean |
|---|---|---|
| Married Families | $99,395 | - |
| Families | $92,255 | $103,025 |
| Households | $71,710 | $87,773 |
| Non Families | $38,039 | $48,730 |
Average Income
Median Household Income
Poverty Rate
