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Marble Rock, IA
Key Indicators
A quick look at key numbers
Population
191
Source: U.S. Census Bureau American Community Survey (ACS) 2020-2024 5-Year Estimates
Median Age
51.5
years ∙ half population younger than 51.5, half older
Diversity Index
11.8%
chance two random people differ in race and ethnicity
Nativity
0%
foreign-born population
Geographic Context
Location, size, and surroundings
About
Marble Rock is a city within Floyd County, Iowa, United States.
Co-ordinates
DEC42.964608° N, 92.867772° W
DMS42° 57′ 52.59″ N, 92° 52′ 03.98″ W
Population Density & area
229.6/sq mi
(88.59/km²)
Demographics & Living
Who lives here, how households are formed, and community composition
Population Composition
Key characteristics of the population
Sex Distribution
50.8%
male
Male
50.8%
Female
49.2%
males per 100 females
Marble Rock
103.2
Floyd County
104.6
Iowa
100.6
Nativity
0%
foreign-born population
% Foreign-born
Marble Rock
0%
Floyd County
2.4%
Iowa
5.9%
Age Distribution
How the population is spread across age groups
Median Age
51.5
years ∙ half population younger than 51.5, half older
Dependency ratio
78.5
dependents per 100 working-age adults
Marble Rock
78.5
Floyd County
84.1
Iowa
69.6
AGE DISTRIBUTION
Distribution of age group
Median age
| Marble Rock | Floyd County | Iowa | |
|---|---|---|---|
| Age Group | |||
| Children (Under 18) | 15.2% | 22.7% | 22.9% |
| Working age (18-64) | 56% | 54.3% | 59% |
| Senior (65+) | 28.8% | 23% | 18.1% |
| Dependency ratio | |||
| Total dependency ratio | 78.5 | 84.1 | 69.6 |
| Child dependency ratio | 27.1 | 41.8 | 38.8 |
| Old-age dependency ratio | 51.4 | 42.4 | 30.7 |
Racial & Ethnic Composition
Racial and ethnic makeup and how it compares
Race & Ethnicity
Note: White, Black, and Asian refer to individuals belonging to a single race and not of Hispanic origin. Hispanics may be of any race.
Diversity Index
11.8%
chance two random people differ in race and ethnicity
Marble Rock
11.8%
Floyd County
20.9%
Iowa
31.4%
Note: The Diversity Index (DI), based on the Blau Index, measures the probability that two randomly selected individuals differ in race and ethnicity. Values range from 0 (no diversity) to 1 (high diversity) and are shown as percentages.
RACIAL & ETHNIC COMPOSITION
Race & Ethnicity
Percentage of Marble Rock population
| Marble Rock | Floyd County | Iowa | |
|---|---|---|---|
| Hispanic or Latino | 0% | 3.9% | 7.3% |
| Mexican | 0% | 3.2% | 5% |
| Puerto Rican | 0% | 0.2% | 0.3% |
| Cuban | 0% | 0% | 0.1% |
| Other Hispanic / Latino | 0% | 0.5% | 1.8% |
| Not Hispanic or Latino | 100% | 96.1% | 92.7% |
| One race | 93.7% | 91.7% | 89.2% |
| White | 93.7% | 88.7% | 82.3% |
| Black or African American | 0% | 1.4% | 3.8% |
| American Indian and Alaska Native | 0% | 0% | 0.2% |
| Asian | 0% | 1.6% | 2.5% |
| Native Hawaiian and Other Pacific Islander | 0% | 0.1% | 0.2% |
| Some Other Race | 0% | 0% | 0.3% |
| Two or more races (Multiracial) | 6.3% | 4.4% | 3.5% |
Household & Families Composition
Household size, type, and family structure
Household structure
60.9%
family
Family
60.9%
Non family
39.1%
% family households
Marble Rock
60.9%
Floyd County
60.8%
Iowa
61.6%
Average household size
2.2
persons per household
Household & Family COMPOSITION
Households
Percentage of Marble Rock population
| Marble Rock | Floyd County | Iowa | |
|---|---|---|---|
| Total households | 87 | 6,503 | 1,315,707 |
| Average houshold size | 2.2 | 2.32 | 2.36 |
| Family households | 53 | 3,957 | 809,836 |
| Average family size | 2.85 | 2.94 | 2.98 |
| Married couple family | 41 | 3,102 | 635,347 |
| Other families | 12 | 855 | 174,489 |
| Male householder | 3 | 243 | 56,457 |
| Female householder | 9 | 612 | 118,032 |
| Non-family households | 34 | 2,546 | 505,871 |
| One-person households | 29 | 2,193 | 406,436 |
| Male householder | 14 | 1,027 | 193,582 |
| Senior (65+) living alone | 10 | 392 | 58,028 |
| Female householder | 15 | 1,166 | 212,854 |
| Senior (65+) living alone | 10 | 683 | 111,645 |
| Other living arrangements | 5 | 353 | 99,435 |
Housing Profile
Housing stock, ownership, rentals, and cost burdens
Total housing units
107
housing units
Marble Rock
107
Floyd County
7,306
Iowa
1,437,699
Occupancy status
81.3%
occupied
Occupied
81.3%
Vacant
18.7%
vacancy rate
Marble Rock
18.7%
Floyd County
11%
Iowa
8.5%
Housing Characteristics
How the housing supply is structured and used
Types of Housing unit
89.7%
Single family houses
Median Year Built
1947
Half of houses were built before 1947, and half after.
Note: Median year built reflects occupied units only; distribution includes all units.
Housing Characteristics
Units, rooms & bedrooms
Physical characteristics of housing units
| Marble Rock | Floyd County | Iowa | |
|---|---|---|---|
| Rooms per unit | |||
| Median rooms | 6.5 | 6.2 | 5.9 |
| 1–3 rooms | 6.5% | 10.3% | 11.8% |
| 4–6 rooms | 43.9% | 46.1% | 47.4% |
| 7+ rooms | 49.6% | 43.6% | 40.7% |
| Bedrooms | |||
| No bedroom / studio | 0.9% | 0.7% | 1.7% |
| 1 bedroom | 7.5% | 9.9% | 9.2% |
| 2 bedrooms | 33.6% | 23% | 27% |
| 3 bedrooms | 34.6% | 38.7% | 37.3% |
| 4+ bedrooms | 23.4% | 27.8% | 24.7% |
| At a glance | |||
| Median year built | 1947 | 1958 | 1972 |
| Total housing units | 107 | 7,306 | 1,437,699 |
Occupancy Profile
Who is inside and how they use it
Homeownership
75.9%
owners
Renter-occupied
24.1%
Owner-occupied
75.9%
homeownership rate
Marble Rock
75.9%
Floyd County
76.6%
Iowa
71.7%
Average household size
2.35
Owner-occupied
1.71
Renter-occupied
owner-occupied average size
Marble Rock
2.35
Floyd County
2.42
Iowa
2.5
Housing Characteristics
Occupied unit characteristics
Tenure, crowding, and utilities
| Marble Rock | Floyd County | Iowa | |
|---|---|---|---|
| Total occupied units | 87 | 6,503 | 1,315,707 |
| Year moved in | |||
| 2020 or later | 11.4% | 17.3% | 24.3% |
| 2010 to 2019 | 31% | 36.3% | 38.7% |
| 2000 to 2009 | 28.7% | 15.8% | 16.4% |
| 1999 or earlier | 28.7% | 30.6% | 20.7% |
| Occupants per room | |||
| 1.00 or fewer | 98.9% | 99.1% | 98.4% |
| 1.01 to 1.50 | 1.1% | 0.9% | 1.1% |
| 1.51 or more | 0% | 0% | 0.5% |
| Vehicles availability | |||
| No vehicles | 2.3% | 6.7% | 5.4% |
| 1 vehicle | 24.1% | 27.7% | 30.5% |
| 2 vehicles | 31% | 30.7% | 37.8% |
| 3 or more vehicles | 42.5% | 34.9% | 26.3% |
| House heating fuel used | |||
| Gas | 88.5% | 75.1% | 72.8% |
| Electricity | 11.5% | 19.5% | 24.4% |
| Solar | 0% | 0% | 0.1% |
| Fuel oil, kerosene etc | 0% | 0.4% | 0.3% |
| All other fuels | 0% | 3.7% | 1.8% |
| No fuel used | 0% | 1.2% | 0.6% |
| Selected characteristics | |||
| Lacking complete plumbing | 1.1% | 0.2% | 0.3% |
| Lacking complete kitchen | 1.1% | 0.7% | 0.8% |
| No telephone service available | 1.1% | 0.2% | 0.8% |
Housing Value
What owner-occupied units are worth
Median home value
$76,000
owner-occupied units
Housing Cost Burden
23.4%
of homeowners with a mortgage are cost-burdened
Note: Households spending 30% or more of their income on housing costs are considered cost-burdened.
Financial characteristics
Property value and housing costs
Tenure, crowding, and utilities
| Marble Rock | Floyd County | Iowa | |
|---|---|---|---|
| Property value | |||
| Median Value | $76,000 | $143,500 | $208,000 |
| Under $100,000 | 57.6% | 31.1% | 17.8% |
| $100,000 - $200,000 | 34.8% | 36.5% | 30% |
| $200,000 - $300,000 | 4.5% | 17.8% | 23.1% |
| $300,000 - $500,000 | 3% | 10.4% | 21.3% |
| $500,000 - $1,000,000 | 0% | 3.7% | 6.8% |
| $1,000,000 and more | 0% | 0.6% | 1.1% |
| Owner-occupied households | |||
| With a mortgage | 45.5% | 53% | 59.4% |
| Without a mortgage | 54.5% | 47% | 40.6% |
| Median monthly owner costs | |||
| With a mortgage | $1,036 | $1,287 | $1,533 |
| Without a mortgage | $500 | $495 | $616 |
| Gross rent | |||
| Median rent | $822 | $745 | $972 |
Education Profile
How educated is the community and how education pays off
Adults with a college degree
3.8%
of adults 25+ with a bachelor's degree or higher
Marble Rock
3.8%
Floyd County
18.3%
Iowa
31.4%
Adults without a high school diploma
4.5%
of adults (25+) without a high school diploma
Marble Rock
4.5%
Floyd County
5%
Iowa
6.7%
School Enrollment
Who is enrolled in school and at what level
School enrollment
35
population (age 3+) enrolled in school
College-going rate (18-24 yr olds)
31%
of 18-24-year-olds in college or graduate school
Enrollment & school type
Enrollment levels, college-going rate, and public vs private school split
Population 3+ currently enrolled in a school
| Marble Rock | Floyd County | Iowa | |
|---|---|---|---|
| Total enrolled (age 3+) | 35 | 2,971 | 784,322 |
| Nursery / preschool | 0% | 10.6% | 6.2% |
| K–12 | 68.6% | 79% | 68.4% |
| Kindergarten | 11.4% | 6.7% | 5.2% |
| Elementary: Grades 1–4 | 8.6% | 21.9% | 20.3% |
| Elementary: Grades 5–8 | 28.6% | 27.3% | 21.3% |
| High School: Grades 9–12 | 20% | 23% | 21.6% |
| College or graduate school | 31.4% | 10.4% | 25.4% |
| College, undergraduate | 31.4% | 9.9% | 20.8% |
| Graduate, professional school | 0% | 0.6% | 4.6% |
| College-going rate · 18-24 yr olds | 31% | 14.8% | 42.3% |
| School type | |||
| Public school | 80% | 90.4% | 84.4% |
| Private school | 20% | 9.6% | 15.6% |
Education Attainment by Level & Gender
What is the highest level of education completed among adults
Education attainment
133
population 25 years and over
Attainment by gender
Male vs Female
Adults (25+) · Share within each education level
Educational Attainment Overview
Distribution and key education attainment rates for adults (25+)
Highest credential completed · adults 25+
| Marble Rock | Floyd County | Iowa | |
|---|---|---|---|
| Population (25+) | 133 | 10,617 | 2,154,149 |
| Less than 9th grade | 1.5% | 2.5% | 2.7% |
| 9th–12th, no diploma | 3% | 2.5% | 4% |
| High school diploma or GED | 57.1% | 41.8% | 30% |
| Some college, no degree | 24.8% | 20% | 19.7% |
| Associate's degree | 9.8% | 14.8% | 12.1% |
| Bachelor's degree or higher | 3.8% | 18.3% | 31.4% |
| Bachelor's degree | 2.3% | 13.5% | 20.9% |
| Graduate or professional | 1.5% | 4.8% | 10.5% |
| High School or higher | 95.5% | 95% | 93.3% |
Earnings by education level
percentage as applicable
Median Earnings
$42,778
Median earnings for adults 25+, by level
Poverty Rate
0%
for ages 25+, with bachelors degree or higher
Outcomes by Education Level
Earnings and poverty rates across education levels (25+)
Adults 25+
| Marble Rock | Floyd County | Iowa | |
|---|---|---|---|
| Median earnings | |||
| Population 25+, with earnings | $42,778 | $47,711 | $51,106 |
| Less than high school graduate | $— | $35,031 | $35,996 |
| High school graduate (includes equivalency) | $41,250 | $45,707 | $41,528 |
| Some college or associate's degree | $60,625 | $43,864 | $47,635 |
| Bachelor's degree | $24,375 | $58,750 | $62,744 |
| Graduate or professional degree | $— | $86,932 | $80,022 |
| Poverty rates | |||
| Less than high school graduate | 33.3% | 7.4% | 21.5% |
| High school graduate (includes equivalency) | 2.6% | 12.6% | 12.4% |
| Some college or associate's degree | 8.7% | 8.2% | 8.1% |
| Bachelor's degree or higher | 0% | 3.2% | 3.8% |
About Neilsberg Research
Neilsberg Research team are data scientists with expertise in processing, analysis and visualization of big data helping small businesses make right decisions.
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