Winterstown, PA has a population of 578 and is the 18,668th largest city in the United States. The population density is 239 per sq mi which is 14% lower than the Pennsylvania average and 164% higher than the national average. The median age in Winterstown is 51 which is approximately 25% higher than the Pennsylvania average of 41. In Winterstown, 70% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 76% of Winterstown residents were born in Pennsylvania, 24% were born out of state, 0% were born outside of the United States and 0% were foreign born.