Duncan township Flag

Duncan township

County:
Mercer County
County Seat:
No
Area (mi²):
36.636
State:
Illinois

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.

256
Total Population
7
Density (mi²)
0 0%
Growth

Duncan township Population

Demographics

Economics and Income Statistics

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)