Marble Rock demographics profile

StatisticMarble RockIowaNational
Population3163,106,589318,558,162
Population density (sq mi)3815591
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%
Marble Rock, IA has a population of 316 and is the 22,203rd largest city in the United States. The population density is 381 per sq mi which is 597% higher than the Iowa average and 320% higher than the national average. The median age in Marble Rock is 49 which is approximately 30% higher than the Iowa average of 38. In Marble Rock, 71% of the population over 15 years of age are married, 96% speak English and 3% speak Spanish. 85% of Marble Rock residents were born in Iowa, 11% were born out of state, 1% were born outside of the United States and 3% were foreign born.
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Did you know?

  • The population density in Marble Rock is 597% 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 or African American.
  • In Marble Rock 0.00% of the population is Asian.

Compare Marble Rock, IA Demographics To Other Cities

Marble Rock population breakdown by race

RaceMarble RockIowaNational
White98.73%90.90%73.35%
Black or African American0.32%3.32%12.63%
Asian0.00%2.14%5.22%
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.

Languages spoken

Place of birth by citizenship

Household income distribution

Source of income

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).
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