North Haven, CT has a population of 23,888 and is the 1,830th largest city in the United States. The population density is 1,146 per sq mi which is 77% higher than the Connecticut average and 1165% higher than the national average. The median age in North Haven is 45 which is approximately 12% higher than the Connecticut average of 41. In North Haven, 65% of the population over 15 years of age are married, 85% speak English and 4% speak Spanish. 73% of North Haven residents were born in Connecticut, 16% were born out of state, 1% were born outside of the United States and 10% were foreign born.