Merritt Island is a census-designated place in Brevard County, Florida, United States, located on the eastern Floridian coast, along the Atlantic Ocean. The population was 34,518 at the 2020 census. It is part of the Palm Bay – Melbourne – Titusville, Florida Metropolitan Statistical Area. The name "Merritt Island" also refers to the extent of the peninsula, misnamed an "island".
Merritt Island National Wildlife Refuge and NASA's John F. Kennedy Space Center are located on the northern part of Merritt Island. The southern area is heavily residential, with centralized light commercial and light industrial areas.
The central part of Merritt Island, previously known as Merritt City, is home to the majority of the population and includes the local high school, library, and shopping district.