Duncan Flag

Duncan

County:
Hancock County
County Seat:
No
Area (mi²):
0.785
State:
Iowa

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.

67
Total Population
85
Density (mi²)
-5 -6.94%
Growth

Duncan Population

Duncan Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Duncan includes 100% White, and smaller percentages for and multiracial populations.

Population by Race

Race
Population
Percentage (of total)
White41100%

Duncan Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

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)