Durham, NH has a population of 10,666 and is the 3,757th largest city in the United States. The population density is 3,975 per sq mi which is 2714% higher than the New Hampshire average and 4288% higher than the national average. The median age in Durham is 20 which is approximately 52% lower than the New Hampshire average of 42. In Durham, 14% of the population over 15 years of age are married, 90% speak English and 1% speak Spanish. 28% of Durham residents were born in New Hampshire, 64% were born out of state, 1% were born outside of the United States and 7% were foreign born.