Duncan, Iowa Demographics & Population 2026
During the 2020–2024 ACS period, Duncan, Iowa had a total population of 21, the 1000th largest community in Iowa. The poverty rate is 57.1%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- More than 1 in 4 residents live below the poverty line (57.1%), well above the national average of 12.4%.
- Only 0.0% of adults have a bachelor's degree, well below the national average of 35.7%.
Duncan Quick Facts
How Duncan Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 41 | 21 | -48.8% |
How Duncan Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A less diverse community where one racial or ethnic group represents a large majority.
State average: 31 | National average: 61
Education
Educational Attainment (Adults 25+)
Duncan Rankings in Iowa
Explore Iowa Rankings
Other Cities in Hancock County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Forest City | 4,290 | $69,205 | 12.4% | $143,500 |
| Garner | 3,049 | $70,726 | 11.5% | $186,300 |
| Britt | 1,882 | $72,943 | 10.1% | $101,900 |
| Kanawha | 756 | $68,250 | 8.7% | $77,600 |
| Klemme | 544 | $59,256 | 13.4% | $77,900 |
| Crystal Lake | 283 | $66,875 | 12.7% | $100,300 |
| Goodell | 268 | $87,813 | 10.1% | $57,100 |
| Corwith | 249 | $55,313 | 50.2% | $58,300 |
| Woden | 219 | $50,000 | 32.4% | $76,000 |
| Miller | 25 | N/A | 0.0% | N/A |
Cities Similar to Duncan
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Mona | 21 | N/A | N/A | 0.0% | 0.0% |
| Elkport | 22 | N/A | $64,200 | 0.0% | 4.5% |
| Jolley | 19 | N/A | N/A | 0.0% | 52.6% |
| Le Roy | 19 | $56,875 | N/A | 0.0% | 5.3% |
| Sexton | 24 | N/A | N/A | 29.2% | 0.0% |
A note before these figures: with a population of 21, Duncan's ACS estimates come from a small number of survey responses and carry wide margins of error. Individual percentages below — particularly rates that round to 0% or 100% — are approximations, not precise measurements. See data.census.gov for the published margins of error.
Population Overview
Duncan is a small community located in Iowa, within Hancock County. The total population is 21. It ranks as the 1000th most populous out of 1,017 Census-designated places in Iowa.
Age Demographics
The median age in Duncan is 55.3 years. This is 43% higher than the state median of 38.6 years.
Economy, Income & Housing
The poverty rate stands at 57.1%. This is 416% higher than the state poverty rate of 11.1%. With more than one in five residents living below the poverty line, economic hardship is a significant challenge for the community. The survey records no unemployed residents in Duncan, which reflects the size of the sample rather than a labor market without joblessness. Every occupied housing unit the survey reached in Duncan was renter-occupied. At this sample size that indicates no owner-occupied homes were captured rather than that none exist.
Race & Ethnicity
Every resident counted in Duncan was recorded as White (non-Hispanic). A figure of exactly 100.0% reflects a survey sample too small to capture the community's full composition rather than a precise measurement.
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. Nationally, 35.7% of adults hold at least a bachelor's degree. No surveyed resident aged 25 or older reported leaving school before earning a high school diploma, though a rate of exactly 100% reflects the limits of a small sample.
Data Sources & Methodology
All demographic data for Duncan, Iowa is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Iowa state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,017 Census-designated places in Iowa. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.
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Frequently Asked Questions
What is the population of Duncan, Iowa?
Duncan, Iowa has a population of 21 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Duncan, IA?
The Census Bureau does not publish a reliable median household income estimate for Duncan — the community is too small for the ACS sample. The national median is $80,734.
What is the poverty rate in Duncan, IA?
The poverty rate in Duncan is 57.1%. This means approximately 12 residents live below the federal poverty line.
What is the racial makeup of Duncan, Iowa?
Duncan's population is 100.0% White, 0.0% Black, 0.0% Hispanic/Latino, and 0.0% Asian.
What is the median home value in Duncan, IA?
The Census Bureau does not publish a reliable median home value estimate for Duncan — there are too few owner-occupied homes in the ACS sample. The national median is $332,700.
How educated is Duncan, Iowa?
0.0% of adults (25+) in Duncan hold a bachelor's degree or higher, and 0.0% hold a graduate or professional degree.