Fort Green Springs, FL has a population of 390 and is the 21,013th largest city in the United States. The population density is 38 per sq mi which is 87% lower than the Florida average and 58% lower than the national average. The median age in Fort Green Springs is 42 which is approximately 1% higher than the Florida average of 42. In Fort Green Springs, 42% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 50% of Fort Green Springs residents were born in Florida, 50% were born out of state, 0% were born outside of the United States and 0% were foreign born.