Flagler Beach, FL has a population of 4,784 and is the 6,661st largest city in the United States. The population density is 1,307 per sq mi which is 219% higher than the Florida average and 1343% higher than the national average. The median age in Flagler Beach is 59 which is approximately 42% higher than the Florida average of 42. In Flagler Beach, 70% of the population over 15 years of age are married, 96% speak English and 2% speak Spanish. 23% of Flagler Beach residents were born in Florida, 72% were born out of state, 1% were born outside of the United States and 4% were foreign born.