Warner, NH has a population of 473 and is the 19,874th largest city in the United States. The population density is 591 per sq mi which is 318% higher than the New Hampshire average and 552% higher than the national average. The median age in Warner is 39 which is approximately 8% lower than the New Hampshire average of 42. In Warner, 63% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 67% of Warner residents were born in New Hampshire, 32% were born out of state, 0% were born outside of the United States and 2% were foreign born.