Population density (sq mi)1,74922891
Median age38.637.437.7
Male/Female ratio0.9:11.0:11.0:1
Married (15yrs & older)49%55%55%
Families w/ Kids under 1842%44%43%
Speak English96%77%79%
Speak Spanish2%13%13%

Key findings

  • The population density in Decatur is 667% higher than Illinois
  • The median age in Decatur is 3% higher than Illinois
  • In Decatur 71.64% of the population is White
  • In Decatur 20.09% of the population is Black
  • In Decatur 1.19% of the population is Asian

Compare Decatur, IL Demographics


      Decatur population breakdown by race

      American Indian0.28%0.23%0.82%
      Native Hawaiian0.00%0.03%0.18%
      Mixed race6.17%2.34%3.06%
      Other race0.63%5.86%4.75%
      In Decatur, 2.5% 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

      Decatur age breakdown

      Marital status

      Age of children in married couples

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