Colwyn, PA has a population of 2,557 and is the 9,714th largest city in the United States. The population density is 9,893 per sq mi which is 3470% higher than the Pennsylvania average and 10820% higher than the national average. The median age in Colwyn is 33 which is approximately 19% lower than the Pennsylvania average of 41. In Colwyn, 38% of the population over 15 years of age are married, 82% speak English and 4% speak Spanish. 66% of Colwyn residents were born in Pennsylvania, 10% were born out of state, 1% were born outside of the United States and 23% were foreign born.