Merritt Island is a census-designated place located in the U.S. state of Florida. It is within Brevard County specifically on the eastern side of Floridian coast in Atlantic Ocean. It has a total area of 47.2 square miles at 28°21′28″N 80°41′5″W. The elevation is 3 feet above sea level. As of the 2010 census data, it had a total population of 34,743. The population density was 740/sq mi. It has Zip codes 32952-32954.