Duncan is a CDP located in Hancock County, Iowa. Duncan has a 2025 population of 67. Duncan is currently declining at a rate of -6.94% annually and its population has decreased by -34.31% since the most recent census, which recorded a population of 102 in 2020.
The median age in Duncan is 55.4 years: 29 years for males, and 0 years for females.
Data after 2023 is projected based on recent change
The racial composition of Duncan includes 100% White, and smaller percentages for and multiracial populations.
Race | Population | Percentage (of total) |
---|---|---|
White | 41 | 100% |
Married
Widowed
Divorced
Separated
Never Married