Greenfield, IN has a population of 21,380 and is the 2,031st largest city in the United States. The population density is 1,577 per sq mi which is 778% higher than the Indiana average and 1640% higher than the national average. The median age in Greenfield is 37 which is approximately 1% lower than the Indiana average of 37. In Greenfield, 57% of the population over 15 years of age are married, 97% speak English and 2% speak Spanish. 77% of Greenfield residents were born in Indiana, 21% were born out of state, 0% were born outside of the United States and 2% were foreign born.