Heathrow, FL has a population of 6,157 and is the 5,662nd largest city in the United States. The population density is 2,183 per sq mi which is 643% higher than the Florida average and 2309% higher than the national average. The median age in Heathrow is 47 which is approximately 13% higher than the Florida average of 42. In Heathrow, 63% of the population over 15 years of age are married, 79% speak English and 12% speak Spanish. 29% of Heathrow residents were born in Florida, 51% were born out of state, 2% were born outside of the United States and 19% were foreign born.