Duncan, IA has a population of 96 and is the 27,042nd largest city in the United States. The population density is 122 per sq mi which is 124% higher than the Iowa average and 35% higher than the national average. The median age in Duncan is 39 which is approximately 3% higher than the Iowa average of 38. In Duncan, 0% of the population over 15 years of age are married, 89% speak English and 11% speak Spanish. 77% of Duncan residents were born in Iowa, 0% were born out of state, 11% were born outside of the United States and 11% were foreign born.
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The population density in Duncan is 124% higher than Iowa.
The median age in Duncan is 3% higher than Iowa.
In Duncan 77.08% of the population is White.
In Duncan 11.46% of the population is Black or African American.