Population density (sq mi)36622891
Median age55.737.437.7
Male/Female ratio0.9:11.0:11.0:1
Married (15yrs & older)67%55%55%
Families w/ Kids under 1822%44%43%
Speak English97%77%79%
Speak Spanish3%13%13%

Key findings

  • The population density in Marietta is 60% higher than Illinois
  • The median age in Marietta is 49% higher than Illinois
  • In Marietta 83.00% of the population is White
  • In Marietta 15.00% of the population is Black
  • In Marietta 0.00% of the population is Asian

Compare Marietta, IL Demographics


      Marietta population breakdown by race

      American Indian0.00%0.23%0.82%
      Native Hawaiian0.00%0.03%0.18%
      Mixed race1.00%2.34%3.06%
      Other race1.00%5.86%4.75%
      In Marietta, 2.0% 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

      Marietta age breakdown

      Marital status

      Age of children in married couples

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