Marble Rock Flag

Marble Rock

County:
Floyd County
County Seat:
No
Area (mi²):
0.832
State:
Iowa

Marble Rock is a city located in Floyd County, Iowa. Marble Rock has a 2025 population of 258. Marble Rock is currently declining at a rate of -0.77% annually and its population has decreased by -3.73% since the most recent census, which recorded a population of 268 in 2020.

The average household income in Marble Rock is $74,936 with a poverty rate of 7.04%.The median age in Marble Rock is 55.1 years: 52.5 years for males, and 55.8 years for females.

258
Total Population
310
Density (mi²)
-2 -0.77%
Growth

Marble Rock Population

Marble Rock Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Marble Rock includes 95.48% White, and smaller percentages for and multiracial populations.

Population by Race

Race
Population
Percentage (of total)
White19095.48%
Two or more races94.52%

Marble Rock Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Marble Rock's average per capita income is $36,635. Household income levels show a median of $65,938. The poverty rate stands at 7.04%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median
Mean
Married Families$110,000-
Families$76,875$102,906
Households$65,938$74,936
Non Families$33,929$42,980

$36,635

Average Income

$65,938

Median Household Income

7.04%

Poverty Rate

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)