StatisticDuncanIowaNational
Population963,155,070328,239,523
Population density (sq mi)1225791
Median age39.338.037.7
Male/Female ratio1.1:11.0:11.0:1
Married (15yrs & older)0%60%55%
Families w/ Kids under 18n/a44%43%
Speak English89%92%79%
Speak Spanish11%4%13%

Key findings

  • The population density in Duncan is 114% 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
  • In Duncan 0.00% of the population is Asian

Compare Duncan, IA Demographics

      vs

      Duncan population breakdown by race

      RaceDuncanIowaNational
      White77.08%90.90%73.35%
      Black11.46%3.32%12.63%
      Asian0.00%2.14%5.22%
      American Indian0.00%0.32%0.82%
      Native Hawaiian0.00%0.08%0.18%
      Mixed race11.46%1.97%3.06%
      Other race0.00%1.27%4.75%
      In Duncan, 11.5% of people are of Hispanic or Latino origin.
      Please note: Hispanics may be of any race, so also are included in any/all of the applicable race categories above.

      Household income distribution

      Place of birth by citizenship

      Duncan age breakdown

      Marital status

      Age of children in married couples

      Source: The Duncan, IA demographics data displayed above is derived from the 2016 United States Census Bureau American Community Survey (ACS).