Estero is a census-esignated place (CDP) in Lee County, Florida, United States. As of the 2000 census, the CDP population was 9,503. It is the home of Germain Arena, which hosts the home games for the Florida Everblades ECHL hockey team and the Florida Firecats af2 arena football team. Florida Gulf Coast University is also located just outside of the Estero Planning District.