Population Demographics. The population of LaBelle, FL is 4,640. The top three races (in population) are: White [68.3%], Hispanic [47.0%] and Black or African American [8.1%]. 45.5% of people in LaBelle, FL are single and 54.5% are married. 74.1% of the population graduated high school or have a GED. 9.2% have college degrees.