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 2026 population of 20. Duncan is currently declining at a rate of -25.93% annually and its population has decreased by 0% since the most recent census, which recorded a population of 0 in 2020.

The median age in Duncan is 55.3 years: 0 years for males, and 0 years for females. For every 100 females there are 320.0 males.

20
Total Population
25
Density (mi²)
-7 -25.93%
Growth

Duncan Population

Duncan Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
202620-7-25.93%
202527-7-20.59%

Median Age

Overall: 55.3 years
Female: 0 years
Male: 0 years

Duncan Adults

There are 21 adults, (7 of whom are seniors) in Duncan.

Sex Ratio

Female: 5 (23.8%)
Male: 16 (76.2%)

Demographics

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

Population by Race

Race
Population ↓
Percentage (of total)
White21100%
Race
Population ↓
Percentage (of total)
White21100%

Duncan Marital Status

Nearby Cities

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)