StatisticMarble RockIowaNational
Population density (sq mi)3815791
Median age49.438.037.7
Male/Female ratio1.3:11.0:11.0:1
Married (15yrs & older)71%60%55%
Families w/ Kids under 1826%44%43%
Speak English96%92%79%
Speak Spanish3%4%13%

Key findings

  • The population density in Marble Rock is 568% higher than Iowa
  • The median age in Marble Rock is 30% higher than Iowa
  • In Marble Rock 98.73% of the population is White
  • In Marble Rock 0.32% of the population is Black
  • In Marble Rock 0.00% of the population is Asian

Compare Marble Rock, IA Demographics


      Marble Rock population breakdown by race

      RaceMarble RockIowaNational
      American Indian0.32%0.32%0.82%
      Native Hawaiian0.00%0.08%0.18%
      Mixed race0.63%1.97%3.06%
      Other race0.00%1.27%4.75%
      In Marble Rock, 3.2% 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

      Marble Rock age breakdown

      Marital status

      Age of children in married couples

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