There are two types of fire ants in Florida, the red imported fire ant (RIFA), followed by the much less common Solenopsis geminata (Fabricius), the tropical or native fire ant.
RIFA is listed as one of the most destructive insects from a financial perspective. Areas fully infested with them become uninhabitable by humans, and they cannot be eradicated once firmly established.
I have mostly the small fire ants, but there are also some fire ants in this area that are about twice the size of the little ones and those big ones deliver bites like a yellowjacket sting.