Niantic, CT has a population of 3,042 and is the 8,747th largest city in the United States. The population density is 2,044 per sq mi which is 216% higher than the Connecticut average and 2156% higher than the national average. The median age in Niantic is 53 which is approximately 30% higher than the Connecticut average of 41. In Niantic, 53% of the population over 15 years of age are married, 96% speak English and 2% speak Spanish. 62% of Niantic residents were born in Connecticut, 33% were born out of state, 0% were born outside of the United States and 4% were foreign born.