Bradenton Beach is a city on Anna Maria Island in Manatee County, Florida, United States. The population was 908 at the 2020 census, d…Bradenton Beach is a city on Anna Maria Island in Manatee County, Florida, United States. The population was 908 at the 2020 census, down from 1,171 in 2010. It is part of the North Port-Bradenton-Sarasota, Florida Metropolitan Statistical Area.