Naugatuck, CT has a population of 31,625 and is the 1,349th largest city in the United States. The population density is 1,940 per sq mi which is 200% higher than the Connecticut average and 2041% higher than the national average. The median age in Naugatuck is 40 which is approximately 3% lower than the Connecticut average of 41. In Naugatuck, 55% of the population over 15 years of age are married, 77% speak English and 7% speak Spanish. 65% of Naugatuck residents were born in Connecticut, 19% were born out of state, 2% were born outside of the United States and 13% were foreign born.