Greenfields, PA has a population of 936 and is the 15,545th largest city in the United States. The population density is 1,264 per sq mi which is 356% higher than the Pennsylvania average and 1295% higher than the national average. The median age in Greenfields is 47 which is approximately 16% higher than the Pennsylvania average of 41. In Greenfields, 56% of the population over 15 years of age are married, 74% speak English and 24% speak Spanish. 66% of Greenfields residents were born in Pennsylvania, 20% were born out of state, 10% were born outside of the United States and 5% were foreign born.