Blue Hills, CT has a population of 3,181 and is the 8,511th largest city in the United States. The population density is 2,730 per sq mi which is 322% higher than the Connecticut average and 2914% higher than the national average. The median age in Blue Hills is 41 which is approximately equal to the Connecticut average of 41. In Blue Hills, 32% of the population over 15 years of age are married, 93% speak English and 2% speak Spanish. 50% of Blue Hills residents were born in Connecticut, 22% were born out of state, 1% were born outside of the United States and 26% were foreign born.