Broad Brook, CT has a population of 4,377 and is the 7,033rd largest city in the United States. The population density is 739 per sq mi which is 14% higher than the Connecticut average and 715% higher than the national average. The median age in Broad Brook is 35 which is approximately 14% lower than the Connecticut average of 41. In Broad Brook, 57% of the population over 15 years of age are married, 93% speak English and 3% speak Spanish. 73% of Broad Brook residents were born in Connecticut, 21% were born out of state, 0% were born outside of the United States and 6% were foreign born.