Milford, NH has a population of 9,136 and is the 4,212th largest city in the United States. The population density is 1,607 per sq mi which is 951% higher than the New Hampshire average and 1674% higher than the national average. The median age in Milford is 40 which is approximately 6% lower than the New Hampshire average of 42. In Milford, 56% of the population over 15 years of age are married, 91% speak English and 2% speak Spanish. 48% of Milford residents were born in New Hampshire, 42% were born out of state, 2% were born outside of the United States and 8% were foreign born.