Fort Walton Beach, FL has a population of 21,238 and is the 2,049th largest city in the United States. The population density is 2,819 per sq mi which is 860% higher than the Florida average and 3012% higher than the national average. The median age in Fort Walton Beach is 40 which is approximately 4% lower than the Florida average of 42. In Fort Walton Beach, 52% of the population over 15 years of age are married, 89% speak English and 5% speak Spanish. 32% of Fort Walton Beach residents were born in Florida, 57% were born out of state, 4% were born outside of the United States and 7% were foreign born.