Devon, PA has a population of 1,880 and is the 11,389th largest city in the United States. The population density is 3,079 per sq mi which is 1011% higher than the Pennsylvania average and 3299% higher than the national average. The median age in Devon is 37 which is approximately 9% lower than the Pennsylvania average of 41. In Devon, 63% of the population over 15 years of age are married, 91% speak English and 3% speak Spanish. 59% of Devon residents were born in Pennsylvania, 30% were born out of state, 4% were born outside of the United States and 7% were foreign born.