Hillsborough, NH has a population of 2,037 and is the 10,909th largest city in the United States. The population density is 1,048 per sq mi which is 642% higher than the New Hampshire average and 1057% higher than the national average. The median age in Hillsborough is 46 which is approximately 8% higher than the New Hampshire average of 42. In Hillsborough, 66% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 67% of Hillsborough residents were born in New Hampshire, 32% were born out of state, 0% were born outside of the United States and 1% were foreign born.