Belleair, FL has a population of 3,958 and is the 7,498th largest city in the United States. The population density is 2,299 per sq mi which is 683% higher than the Florida average and 2438% higher than the national average. The median age in Belleair is 53 which is approximately 28% higher than the Florida average of 42. In Belleair, 64% of the population over 15 years of age are married, 92% speak English and 2% speak Spanish. 26% of Belleair residents were born in Florida, 63% were born out of state, 1% were born outside of the United States and 10% were foreign born.