Riverdale, UT has a population of 8,636 and is the 4,407th largest city in the United States. The population density is 1,845 per sq mi which is 5384% higher than the Utah average and 1936% higher than the national average. The median age in Riverdale is 36 which is approximately 19% higher than the Utah average of 30. In Riverdale, 60% of the population over 15 years of age are married, 89% speak English and 10% speak Spanish. 65% of Riverdale residents were born in Utah, 27% were born out of state, 1% were born outside of the United States and 7% were foreign born.