Durham, CT has a population of 2,687 and is the 9,391st largest city in the United States. The population density is 430 per sq mi which is 42% lower than the Connecticut average and 375% higher than the national average. The median age in Durham is 46 which is approximately 14% higher than the Connecticut average of 41. In Durham, 64% of the population over 15 years of age are married, 98% speak English and 2% speak Spanish. 73% of Durham residents were born in Connecticut, 25% were born out of state, 1% were born outside of the United States and 1% were foreign born.