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is a census-designated place (CDP) in Anne Arundel County, Maryland, United States. The population was 3,153 at the 2000 census. Its beach was formerly a popular weekend resort.
According to the United States Census Bureau, the CDP has a total area of 4.7 square miles (12.1 km²), of which, 2.5 square miles (6.6 km²) of it is land and 2.2 square miles (5.6 km²) of it (45.94%) is water.
Saunder's Point, Shoreham Beach, and Beverly Beach are some of the neighborhoods found in Mayo.