Greenfield, MO has a population of 1,476 and is the 12,783rd largest city in the United States. The population density is 1,299 per sq mi which is 1403% higher than the Missouri average and 1333% higher than the national average. The median age in Greenfield is 42 which is approximately 9% higher than the Missouri average of 38. In Greenfield, 59% of the population over 15 years of age are married, 97% speak English and 0% speak Spanish. 67% of Greenfield residents were born in Missouri, 31% were born out of state, 0% were born outside of the United States and 2% were foreign born.