Mountain Lakes, NH has a population of 450 and is the 20,191st largest city in the United States. The population density is 128 per sq mi which is 10% lower than the New Hampshire average and 41% higher than the national average. The median age in Mountain Lakes is 56 which is approximately 32% higher than the New Hampshire average of 42. In Mountain Lakes, 78% of the population over 15 years of age are married, 96% speak English and 4% speak Spanish. 40% of Mountain Lakes residents were born in New Hampshire, 60% were born out of state, 0% were born outside of the United States and 0% were foreign born.