Riverdale, IA has a population of 481 and is the 19,773rd largest city in the United States. The population density is 262 per sq mi which is 380% higher than the Iowa average and 189% higher than the national average. The median age in Riverdale is 45 which is approximately 18% higher than the Iowa average of 38. In Riverdale, 67% of the population over 15 years of age are married, 93% speak English and 7% speak Spanish. 62% of Riverdale residents were born in Iowa, 36% were born out of state, 0% were born outside of the United States and 2% were foreign born.
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The population density in Riverdale is 380% higher than Iowa.
The median age in Riverdale is 18% higher than Iowa.
In Riverdale 97.92% of the population is White.
In Riverdale 0.42% of the population is Black or African American.