New Wilmington, PA has a population of 2,340 and is the 10,173rd largest city in the United States. The population density is 2,221 per sq mi which is 701% higher than the Pennsylvania average and 2352% higher than the national average. The median age in New Wilmington is 22 which is approximately 47% lower than the Pennsylvania average of 41. In New Wilmington, 35% of the population over 15 years of age are married, 96% speak English and 1% speak Spanish. 66% of New Wilmington residents were born in Pennsylvania, 31% were born out of state, 1% were born outside of the United States and 2% were foreign born.