Collingdale, PA has a population of 8,777 and is the 4,347th largest city in the United States. The population density is 10,095 per sq mi which is 3542% higher than the Pennsylvania average and 11042% higher than the national average. The median age in Collingdale is 35 which is approximately 15% lower than the Pennsylvania average of 41. In Collingdale, 45% of the population over 15 years of age are married, 91% speak English and 2% speak Spanish. 80% of Collingdale residents were born in Pennsylvania, 10% were born out of state, 0% were born outside of the United States and 10% were foreign born.