Belleair, Florida began as a resort town with the construction of the Bellevue Hotel by businessman Henry B. Plant in 1896. The hotel increased tourist interest in the area and created demand for a residential neighborhood. Construction of the first subdivision began in 1924 and the town incorporated in 1925, choosing to be a separate entity from the neighboring City of Clearwater. The Eagles Nest Japanese Gardens, a popular tourist attraction in the town, opened in 1938. As a result of World War II, the gardens were closed in 1952 and turned into the Eagles Nest subdivision.
According to the United States Census Bureau, Belleair has a total area of 2.8 square miles, of which 1.8 square miles is land and 1.0 square mile is water. As of the last census, the population of Belleair is 3,869. In 2020 there were 10 properties that sold with an average sales price of $589,690 with an average of 80 days on market