Population 575 · Census ACS 2020–24
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Population and households in Marble Rock
Household size in Marble Rock
| Period | Marble Rock | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 2.49 | 2.44 | 2.68 |
| 2010–14 | 2.49 | 2.45 | 2.73 |
| 2015–19 | 2.12 | 2.43 | 2.71 |
| 2020–24 | 2.59 | 2.43 | 2.65 |
| Change | +0.11 | −0.01 | −0.03 |
Households in Marble Rock average 2.59 people, about the same as the country as a whole (2.65). The typical household here is bigger than in Iowa as a whole, where it has 2.43 people. Since 2006–10, household size has climbed from 2.49, but in a place this small, much of that may be survey noise rather than real change.
Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).
Median age in Marble Rock
| Period | Marble Rock | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 42.5 | 38.8 | 37.7 |
| 2010–14 | 46.2 | 39.3 | 38.6 |
| 2015–19 | 46.8 | 39.7 | 39.6 |
| 2020–24 | 40.4 | 39.8 | 40.1 |
| Change | −2.1 | +1.0 | +2.3 |
Half of the people in Marble Rock are younger than 40.4 and half are older, close to the national median of 40.1.
Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).
Single-parent households in Marble Rock
| Period | Marble Rock | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 4.0% | 9.5% | 12.3% |
| 2010–14 | 4.3% | 9.9% | 12.3% |
| 2015–19 | 4.0% | 10.0% | 11.6% |
| 2020–24 | 12.9% | 10.0% | 11.6% |
| Change | +8.8 pts | +0.6 pts | −0.6 pts |
Single parents head about one in eight households in Marble Rock (12.9%), a bit above the national share of 11.6%.
Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).
Housing in Marble Rock
Renters in Marble Rock
| Period | Marble Rock | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 21.3% | 26.8% | 33.3% |
| 2010–14 | 18.7% | 28.2% | 35.6% |
| 2015–19 | 23.0% | 28.9% | 36.0% |
| 2020–24 | 16.1% | 28.3% | 34.8% |
| Change | −5.2 pts | +1.5 pts | +1.5 pts |
Only 16.1% of households in Marble Rock rent their homes, far below the national share of 34.8%, so most residents are owners who tend to stay put. Among homeowners, 51.3% have no mortgage at all, well above the national share of 39.8%.
Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).
Vacant homes in Marble Rock
| Period | Marble Rock | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 12.3% | 8.7% | 11.4% |
| 2010–14 | 9.4% | 8.6% | 11.4% |
| 2015–19 | 4.8% | 9.4% | 11.1% |
| 2020–24 | 10.9% | 8.8% | 9.6% |
| Change | −1.4 pts | +0.1 pts | −1.8 pts |
About as many homes sit empty in Marble Rock as nationally: 10.9%, against 9.6%. The rate is higher than in Iowa as a whole (8.8%).
Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).
Age of homes in Marble Rock
| Period | Marble Rock | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 1942 | 1965 | 1974 |
| 2010–14 | 1944 | 1967 | 1975 |
| 2015–19 | 1954 | 1969 | 1977 |
| 2020–24 | 1951 | 1971 | 1980 |
| Change | +9 | +6 | +6 |
The housing in Marble Rock is old by national standards: the median home dates to 1951, against 1980 for the U.S., so buyers will find more older houses, some of them due for updates.
Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).
Rent in Marble Rock
| Period | Marble Rock | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | $581 | $669 | $965 |
| 2010–14 | $701 | $732 | $1,040 |
| 2015–19 | $565 | $821 | $1,213 |
| 2020–24 | $781 | $1,020 | $1,571 |
| Change | +$200 | +$351 | +$606 |
Rent in Marble Rock runs $781 a month at the median, utilities included, well below the U.S. median of $1,571. Rent takes 19.9% of the typical renter's income, comfortably under the 30% mark often used to define affordable rent.
Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).
Education in Marble Rock
Bachelor's degrees in Marble Rock
| Period | Marble Rock | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 11.2% | 26.5% | 28.4% |
| 2010–14 | 15.4% | 27.9% | 29.6% |
| 2015–19 | 12.9% | 29.3% | 32.1% |
| 2020–24 | 21.4% | 32.3% | 35.6% |
| Change | +10.3 pts | +5.8 pts | +7.2 pts |
Fewer adults in Marble Rock have a four-year degree than in the country as a whole: 21.4%, against 35.6% nationally.
Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
High school graduates in Marble Rock
| Period | Marble Rock | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 95.7% | 90.4% | 84.9% |
| 2010–14 | 92.7% | 91.4% | 86.1% |
| 2015–19 | 96.3% | 92.1% | 87.7% |
| 2020–24 | 97.6% | 93.0% | 89.3% |
| Change | +1.9 pts | +2.7 pts | +4.3 pts |
Finishing high school is nearly universal in Marble Rock: 97.6% of adults 25 and older have a diploma or equivalent, well above the national rate of 89.3%.
High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
Jobs in Marble Rock
| Period | Marble Rock | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 3.0% | 5.2% | 8.1% |
| 2010–14 | 2.8% | 5.4% | 9.4% |
| 2015–19 | 1.5% | 3.7% | 5.6% |
| 2020–24 | 3.5% | 3.7% | 5.4% |
| Change | +0.5 pts | −1.5 pts | −2.7 pts |
Unemployment in Marble Rock runs below the national rate: 3.5% of the labor force was out of work and looking, against 5.4% nationally. Iowa as a whole looks much the same. Because the Census pools five years of responses (2020–24), these rates smooth over short swings and lag the current job market.
Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).
Marble Rock compared with nearby cities
| City | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Marble Rock | 2.59 | 40.4 | 12.9% | 16.1% | 10.9% | 1951 | $781 | 21.4% | 97.6% | 3.5% |
| Oakwood | 2.52 | 41.5 | 13.4% | 18.3% | 10.7% | 1954 | $754 | 20.1% | 95.3% | 1.3% |
| Greene | 2.33 | 42.2 | 6.6% | 21.7% | 9.6% | 1947 | $931 | 22.2% | 94.8% | 3.4% |
| Rockford | 2.45 | 41.7 | 7.9% | 20.1% | 10.9% | 1942 | $817 | 18.5% | 94.8% | 3.0% |
| Powersville | 2.66 | 40.9 | 3.7% | 8.1% | 9.8% | 1938 | $782 | 20.1% | 96.7% | 10.1% |
| Dougherty | 2.43 | 49.2 | 9.4% | 12.8% | 12.6% | 1951 | $709 | 22.5% | 96.2% | 5.3% |
| Aredale | 2.18 | 49.2 | 5.1% | 12.9% | 8.6% | 1942 | $598 | 15.0% | 82.9% | 0.6% |
| Cartersville | 2.44 | 48.1 | 5.9% | 8.5% | 9.6% | 1958 | $635 | 29.9% | 93.7% | 5.1% |
| Charles City | 2.29 | 43.5 | 11.0% | 28.3% | 13.2% | 1957 | $730 | 16.1% | 96.0% | 3.4% |
| Rudd | 2.56 | 39.9 | 7.4% | 17.7% | 6.4% | 1941 | $832 | 18.2% | 94.3% | 2.7% |
| Bristow | 2.23 | 47.3 | 2.5% | 16.7% | 9.6% | 1946 | $618 | 13.9% | 83.2% | 0.7% |
All figures 2020–24.
Cities with similar populations: Orcas, WA · Porterville, MS · Poole, KY · Pollard, TN · Pleasant Grove, MS · Plainview, OR · Pittville, CA · Peru, IA · Pennington Chapel, TN · Paterson, WA
About these numbers
Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up Marble Rock. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.
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