Nokomis is a census-designated place (CDP) in Sarasota County, Florida, United States. The population was 3,334 at the 2000 census. It is part of the Bradenton–Sarasota–Venice Metropolitan Statistical Area. Nokomis is famous for Casey Key, a barrier island created by the intracoastal waterway, where there are beachfront houses worth millions of dollars lining the key. Casey Key is divided between Nokomis and the CDP of Osprey