Jacksonville Beach, FL has a population of 22,519 and is the 1,931st largest city in the United States. The population density is 3,071 per sq mi which is 649% higher than the Florida average and 3289% higher than the national average. The median age in Jacksonville Beach is 43 which is approximately 4% higher than the Florida average of 42. In Jacksonville Beach, 53% of the population over 15 years of age are married, 92% speak English and 3% speak Spanish. 38% of Jacksonville Beach residents were born in Florida, 53% were born out of state, 2% were born outside of the United States and 7% were foreign born.