Coatesville, PA has a population of 13,132 and is the 3,181st largest city in the United States. The population density is 7,263 per sq mi which is 2521% higher than the Pennsylvania average and 7917% higher than the national average. The median age in Coatesville is 30 which is approximately 26% lower than the Pennsylvania average of 41. In Coatesville, 37% of the population over 15 years of age are married, 78% speak English and 20% speak Spanish. 72% of Coatesville residents were born in Pennsylvania, 12% were born out of state, 3% were born outside of the United States and 13% were foreign born.