Cornwells Heights, PA has a population of 1,384 and is the 13,160th largest city in the United States. The population density is 2,911 per sq mi which is 950% higher than the Pennsylvania average and 3113% higher than the national average. The median age in Cornwells Heights is 46 which is approximately 13% higher than the Pennsylvania average of 41. In Cornwells Heights, 46% of the population over 15 years of age are married, 90% speak English and 0% speak Spanish. 75% of Cornwells Heights residents were born in Pennsylvania, 17% were born out of state, 1% were born outside of the United States and 6% were foreign born.