Greene, IA has a population of 1,115 and is the 14,479th largest city in the United States. The population density is 982 per sq mi which is 1697% higher than the Iowa average and 983% higher than the national average. The median age in Greene is 46 which is approximately 22% higher than the Iowa average of 38. In Greene, 70% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 86% of Greene residents were born in Iowa, 13% were born out of state, 0% were born outside of the United States and 1% were foreign born.