Derry, NH has a population of 22,392 and is the 1,941st largest city in the United States. The population density is 1,473 per sq mi which is 943% higher than the New Hampshire average and 1526% higher than the national average. The median age in Derry is 39 which is approximately 7% lower than the New Hampshire average of 42. In Derry, 52% of the population over 15 years of age are married, 94% speak English and 2% speak Spanish. 30% of Derry residents were born in New Hampshire, 64% were born out of state, 1% were born outside of the United States and 5% were foreign born.