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 2026 population of 252. Marble Rock is currently declining at a rate of -1.18% annually and its population has decreased by -6.32% since the most recent census, which recorded a population of 269 in 2020.

The median household income in Marble Rock is $65,625 with a poverty rate of 6.28%. The median age in Marble Rock is 51.5 years: 52.1 years for males, and 51.3 years for females. For every 100 females there are 103.2 males.

252
Total Population
303
Density (mi²)
-3 -1.18%
Growth

Marble Rock Population

Marble Rock Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
2026252-3-1.18%
2025255-3-1.16%
2024258-4-1.53%
2023262-1-0.38%
2022263-3-1.13%
2021266-3-1.12%
202026900%
2019290-2-0.68%
2018292-3-1.02%
2017295-1-0.34%
2016296-4-1.33%
2015300-2-0.66%
2014302-1-0.33%
2013303-3-0.98%
201230600%
2011306-1-0.33%
201031000%

Median Age

Overall: 51.5 years
Female: 51.3 years
Male: 52.1 years

Marble Rock Adults

There are 162 adults, (55 of whom are seniors) in Marble Rock.

Sex Ratio

Female: 94 (49.2%)
Male: 97 (50.8%)

Demographics

The racial composition of Marble Rock includes 93.72% White, and smaller percentages for and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White17993.72%
Two or more races126.28%
Race
Population ↓
Percentage (of total)
White17993.72%
Two or more races126.28%

Marble Rock Marital Status

Economics and Income Statistics

Marble Rock 's average per capita income is $42,778. Household income levels show a median of $65,625. The poverty rate stands at 6.28%.

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$107,917-
Families$79,688$94,657
Households$65,625$72,695
Non Families$31,250$34,879

$42,778

Average Income

$65,625

Median Household Income

6.28%

Poverty Rate

Nearby Cities

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)