Rockville, CT has a population of 7,178 and is the 5,092nd largest city in the United States. The population density is 4,245 per sq mi which is 555% higher than the Connecticut average and 4586% higher than the national average. The median age in Rockville is 32 which is approximately 20% lower than the Connecticut average of 41. In Rockville, 35% of the population over 15 years of age are married, 88% speak English and 6% speak Spanish. 70% of Rockville residents were born in Connecticut, 19% were born out of state, 3% were born outside of the United States and 7% were foreign born.