Naugatuck, CT has a population of 31,790 and is the 1,306th largest city in the United States. The population density is 1,950 per sq mi which is 164% higher than the Connecticut average and 2052% higher than the national average. The median age in Naugatuck is 39 which is approximately 4% lower than the Connecticut average of 40. In Naugatuck, 57% of the population over 15 years of age are married, 79% speak English and 6% speak Spanish. 68% of Naugatuck residents were born in Connecticut, 19% were born out of state, 2% were born outside of the United States and 12% were foreign born.