Duncan township is located in Mercer County, Illinois. Duncan township has a 2025 population of 256. Duncan township is currently declining at a rate of 0% annually and its population has decreased by -0.78% since the most recent census, which recorded a population of 258 in 2020.
The average household income in Duncan township is $82,538 with a poverty rate of 7.84%.The median age in Duncan township is 48.8 years: 35.6 years for males, and 62.6 years for females.
Data after 2023 is projected based on recent change
The racial composition of Duncan township includes 100% White, and smaller percentages for and multiracial populations.
Race | Population | Percentage (of total) |
---|---|---|
White | 255 | 100% |
Married
Widowed
Divorced
Separated
Never Married
Duncan township's average per capita income is $40,938. Household income levels show a median of $90,357. The poverty rate stands at 7.84%.
Name | Median | Mean |
---|---|---|
Households | $90,357 | $82,538 |
Families | $90,000 | $85,030 |
Married Families | $90,000 | - |
Non Families | - | $76,309 |
Average Income
Median Household Income
Poverty Rate