Big Coppitt Key is also a census-designated place and an unincorporated village located in the U.S. state of Florida. It is within Monroe County in the lower Florida Keys. It has a total area of 1.5 square miles at 24°35′52″N 81°39′24″W. The elevation is 3 feet above sea level. As of the 2000 census data, it had a total population of 2,595. The population density was 1,730/sq mi.