Franklin, NH has a population of 8,440 and is the 4,494th largest city in the United States. The population density is 308 per sq mi which is 101% higher than the New Hampshire average and 240% higher than the national average. The median age in Franklin is 42 which is approximately equal to the New Hampshire average of 42. In Franklin, 49% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 63% of Franklin residents were born in New Hampshire, 36% were born out of state, 1% were born outside of the United States and 1% were foreign born.