Fellsmere, FL has a population of 5,424 and is the 6,118th largest city in the United States. The population density is 94 per sq mi which is 68% lower than the Florida average and 4% higher than the national average. The median age in Fellsmere is 28 which is approximately 32% lower than the Florida average of 42. In Fellsmere, 56% of the population over 15 years of age are married, 19% speak English and 81% speak Spanish. 45% of Fellsmere residents were born in Florida, 12% were born out of state, 0% were born outside of the United States and 44% were foreign born.