Riverside, CT has a population of 8,289 and is the 4,579th largest city in the United States. The population density is 3,433 per sq mi which is 430% higher than the Connecticut average and 3689% higher than the national average. The median age in Riverside is 41 which is approximately 1% higher than the Connecticut average of 41. In Riverside, 67% of the population over 15 years of age are married, 74% speak English and 11% speak Spanish. 30% of Riverside residents were born in Connecticut, 45% were born out of state, 3% were born outside of the United States and 21% were foreign born.