Oakville, CT has a population of 9,133 and is the 4,213th largest city in the United States. The population density is 2,814 per sq mi which is 334% higher than the Connecticut average and 3006% higher than the national average. The median age in Oakville is 45 which is approximately 11% higher than the Connecticut average of 41. In Oakville, 59% of the population over 15 years of age are married, 85% speak English and 2% speak Spanish. 77% of Oakville residents were born in Connecticut, 13% were born out of state, 1% were born outside of the United States and 8% were foreign born.