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.

Demographics

The racial composition of Marble Rock includes 95.48% White, and smaller percentages for Black or African American, Native American, Asian, Native Hawaiian or Pacific Islander, other race and multiracial populations.

Population by Race

White

Two or more races

Black or African American

Native American

Asian

Native Hawaiian or Pacific Islander

Other race

Race	Population	Percentage (of total)
White	190	95.48%
Two or more races	9	4.52%
Black or African American	0	0%
Native American	0	0%
Asian	0	0%
Native Hawaiian or Pacific Islander	0	0%
Other race	0	0%

Marble Rock Marital Status

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