Berlin, NH has a population of 10,154 and is the 3,901st largest city in the United States. The population density is 166 per sq mi which is 17% higher than the New Hampshire average and 83% higher than the national average. The median age in Berlin is 42 which is approximately 2% lower than the New Hampshire average of 42. In Berlin, 48% of the population over 15 years of age are married, 80% speak English and 3% speak Spanish. 68% of Berlin residents were born in New Hampshire, 27% were born out of state, 1% were born outside of the United States and 4% were foreign born.