Elfers is a census-designated place in Pasco County, Florida, United States. The population was 13,161 at the 2000 census. Elfers is located at 28°12′58″N 82°43′22″W / 28.21611°N 82.72278°W. According to the United States Census Bureau, the CDP has a total area of 3.5 square miles, of which 3.5 square miles is land and 0.04 square miles is water.