Duncan CDP, Iowa Demographics & Population 2026

Population Overview

Duncan CDP is a small community located in Iowa. The total population is 41. It ranks as the 962nd most populous out of 1,018 cities and towns in Iowa.

Age Demographics

The median age in Duncan CDP is 55.4 years. This is 44% higher than the state median of 38.6 years. Only 0.0% of residents are under 18, indicating fewer families with children. 24.4% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The poverty rate stands at 78.0%. This is 610% higher than the state poverty rate of 11.0%. With more than one in five residents living below the poverty line, economic hardship is a significant challenge for the community. The unemployment rate is 0.0%. This is 100% lower than the state rate of 3.6%. 71.4% of occupied housing units are owner-occupied.

Race & Ethnicity

Duncan CDP has a predominantly White (non-Hispanic) population, comprising 100.0% of all residents.

Education

0.0% of residents aged 25 and older hold a bachelor's degree or higher. This is among the lowest rates in the state, which may correlate with employment and income patterns. This is 100% lower than the state rate of 30.9%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 68.8%.

Data Sources & Methodology

All demographic data for Duncan CDP, Iowa is sourced from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates (2019-2023). The ACS collects data from approximately 3.5 million households annually, providing reliable estimates for communities of all sizes. Comparisons are made against Iowa state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,018 Census-designated places in Iowa. For official data, visit data.census.gov.