Pleasant Hills, PA has a population of 8,271 and is the 4,589th largest city in the United States. The population density is 2,979 per sq mi which is 975% higher than the Pennsylvania average and 3188% higher than the national average. The median age in Pleasant Hills is 47 which is approximately 15% higher than the Pennsylvania average of 41. In Pleasant Hills, 70% of the population over 15 years of age are married, 94% speak English and 2% speak Spanish. 85% of Pleasant Hills residents were born in Pennsylvania, 11% were born out of state, 1% were born outside of the United States and 4% were foreign born.