Merritt Island, FL has a population of 35,916 and is the 1,175th largest city in the United States. The population density is 2,049 per sq mi which is 598% higher than the Florida average and 2162% higher than the national average. The median age in Merritt Island is 49 which is approximately 18% higher than the Florida average of 42. In Merritt Island, 58% of the population over 15 years of age are married, 90% speak English and 5% speak Spanish. 35% of Merritt Island residents were born in Florida, 55% were born out of state, 3% were born outside of the United States and 7% were foreign born.