Belleair Beach, FL has a population of 1,590 and is the 12,365th largest city in the United States. The population density is 3,335 per sq mi which is 1036% higher than the Florida average and 3580% higher than the national average. The median age in Belleair Beach is 58 which is approximately 38% higher than the Florida average of 42. In Belleair Beach, 74% of the population over 15 years of age are married, 91% speak English and 1% speak Spanish. 16% of Belleair Beach residents were born in Florida, 72% were born out of state, 0% were born outside of the United States and 12% were foreign born.