Mercer County's estimated 2026 population is 14,964 with a growth rate of -1.08% in the past year according to the most recent United States census data. Mercer County is the 70th largest county in Illinois. The 2010 population was 16,410 and has seen a growth of -8.81% 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 and multiracial populations.
White (94.77%)
Two or more races (3.37%)
Other race (0.88%)
Black or African American (0.56%)
Asian (0.33%)
Native American (0.09%)
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% |
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
