Marble Rock city, Iowa Demographics & Population 2026

Population Overview

Marble Rock city is a small community located in Iowa. The total population is 199. It ranks as the 702nd most populous out of 1,018 cities and towns in Iowa.

Age Demographics

The median age in Marble Rock city is 55.1 years. This is 43% higher than the state median of 38.6 years. Only 13.6% of residents are under 18, indicating fewer families with children.

Economy, Income & Housing

The median household income in Marble Rock city is $65,938. This is 10% lower than the state median of $73,147. Compared to the national median of $78,538, household income here is 16% lower. The poverty rate stands at 7.0%. This is 36% lower than the state poverty rate of 11.0%. The unemployment rate is 5.2%. This is 42% higher than the state rate of 3.6%. The median home value is $59,300. Housing costs are 70% lower than the state median of $195,900. With a home-value-to-income ratio of just 0.9x, Marble Rock city is one of the most affordable housing markets in the area. 74.8% of occupied housing units are owner-occupied. This homeownership rate is 5% higher than the state average of 71.5%.

Race & Ethnicity

Marble Rock city has a predominantly White (non-Hispanic) population, comprising 95.5% of all residents.

Education

3.3% of residents aged 25 and older hold a bachelor's degree or higher. This is among the lowest rates in the state, which may correlate with employment and income patterns. This is 89% lower than the state rate of 30.9%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 92.8%.

Data Sources & Methodology

All demographic data for Marble Rock city, Iowa is sourced from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates (2019-2023). The ACS collects data from approximately 3.5 million households annually, providing reliable estimates for communities of all sizes. Comparisons are made against Iowa state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,018 Census-designated places in Iowa. For official data, visit data.census.gov.