Marble Rock is a city in Floyd County,

Iowa Iowa () is a state in the Midwestern region of the United States, bordered by the Mississippi River to the east and the Missouri River and Big Sioux River to the west. It is bordered by six states: Wisconsin to the northeast, Illinois to the ...

, United States, along the

Shell Rock River The Shell Rock River is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed May 13, 2011 tributary of the West Fork Cedar River in southern Minnesota and northern Iowa in the United States ...

. The population was 271 at the time of the 2020 census. Marble Rock has a city park, historical museums, a powerhouse on the river, and a veterans' memorial. The Marble Rock Historical Society has a website with information about the museums

Geography

Marble Rock is located at (42.964695, -92.867786). Its name derives from the presence of white limestone in the area. The Shell Rock River runs through the west side of town and is available for fishermen and small watercraft. There is a portage around the dam, on the west side of the river, for canoes. According to the

United States Census Bureau The United States Census Bureau (USCB), officially the Bureau of the Census, is a principal agency of the U.S. Federal Statistical System, responsible for producing data about the American people and economy. The Census Bureau is part of the ...

, the city has a total area of , of which is land and is water.

Demographics

2010 census

As of the

census A census is the procedure of systematically acquiring, recording and calculating information about the members of a given population. This term is used mostly in connection with national population and housing censuses; other common censuses incl ...

of 2010, there were 307 people, 134 households, and 84 families residing in the city. The

population density Population density (in agriculture: standing stock or plant density) is a measurement of population per unit land area. It is mostly applied to humans, but sometimes to other living organisms too. It is a key geographical term.Matt RosenberPopul ...

was . There were 150 housing units at an average density of . The racial makeup of the city was 99.0%

White White is the lightest color and is achromatic (having no hue). It is the color of objects such as snow, chalk, and milk, and is the opposite of black. White objects fully reflect and scatter all the visible wavelengths of light. White on ...

, 0.3%

Asian Asian may refer to: * Items from or related to the continent of Asia: ** Asian people, people in or descending from Asia ** Asian culture, the culture of the people from Asia ** Asian cuisine, food based on the style of food of the people from Asi ...

, and 0.7% from two or more races. There were 134 households, of which 27.6% had children under the age of 18 living with them, 50.0% were

married couples Marriage, also called matrimony or wedlock, is a culturally and often legally recognized union between people called spouses. It establishes rights and obligations between them, as well as between them and their children, and between t ...

living together, 8.2% had a female householder with no husband present, 4.5% had a male householder with no wife present, and 37.3% were non-families. 32.1% of all households were made up of individuals, and 13.4% had someone living alone who was 65 years of age or older. The average household size was 2.29 and the average family size was 2.85. The median age in the city was 47.5 years. 21.8% of residents were under the age of 18; 5.2% were between the ages of 18 and 24; 20.4% were from 25 to 44; 32.2% were from 45 to 64; and 20.2% were 65 years of age or older. The gender makeup of the city was 48.9% male and 51.1% female.

2000 census

As of the

of 2000, there were 326 people, 141 households, and 95 families residing in the city. The population density was . There were 157 housing units at an average density of . The racial makeup of the city was 99.39%

, and 0.61% from two or more races. There were 141 households, out of which 26.2% had children under the age of 18 living with them, 54.6% were

living together, 7.1% had a female householder with no husband present, and 32.6% were non-families. 30.5% of all households were made up of individuals, and 18.4% had someone living alone who was 65 years of age or older. The average household size was 2.31 and the average family size was 2.78. In the city, the population was spread out, with 21.5% under the age of 18, 10.4% from 18 to 24, 22.4% from 25 to 44, 25.2% from 45 to 64, and 20.6% who were 65 years of age or older. The median age was 42 years. For every 100 females, there were 100.0 males. For every 100 females age 18 and over, there were 96.9 males. The median income for a household in the city was $35,500, and the median income for a family was $38,750. Males had a median income of $27,917 versus $24,688 for females. The

per capita income Per capita income (PCI) or total income measures the average income earned per person in a given area (city, region, country, etc.) in a specified year. It is calculated by dividing the area's total income by its total population. Per capita i ...

for the city was $17,937. About 4.2% of families and 7.2% of the population were below the

poverty line The poverty threshold, poverty limit, poverty line or breadline is the minimum level of income deemed adequate in a particular country. The poverty line is usually calculated by estimating the total cost of one year's worth of necessities for t ...

, including 15.4% of those under age 18 and 9.7% of those age 65 or over.

Education

The

Rudd-Rockford-Marble Rock Community School District Rudd-Rockford-Marble Rock Community School District (RRMR) is a rural public school district headquartered in Rockford, Iowa. It operates the RRMR Elementary School/Preschool and RRMR Junior-Senior High School, both in Rockford. The district is ...

operates area public schools.

References

{{authority control Cities in Iowa Cities in Floyd County, Iowa