Marble Rock, IA has a population of 316 and is the 22,203rd largest city in the United States. The population density is 381 per sq mi which is 597% higher than the Iowa average and 320% higher than the national average. The median age in Marble Rock is 49 which is approximately 30% higher than the Iowa average of 38. In Marble Rock, 71% of the population over 15 years of age are married, 96% speak English and 3% speak Spanish. 85% of Marble Rock residents were born in Iowa, 11% were born out of state, 1% were born outside of the United States and 3% were foreign born.
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The population density in Marble Rock is 597% higher than Iowa.
The median age in Marble Rock is 30% higher than Iowa.
In Marble Rock 98.73% of the population is White.
In Marble Rock 0.32% of the population is Black or African American.