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Glenn Dale is an unincorporated area and census-designated place (CDP) in Prince George's County, Maryland, United States. The population was 13,466 at the 2010 census. Glenn Dale is home to theGlenn Dale Hospital, an abandoned sanatorium, and the USDA Plant Introduction Station. Glenn Dale is located at 38°58′58″N 76°48′24″W (38.982902, -76.806748).According to the United States Census Bureau, the CDP has a total area of 7.2 square miles (18.7 km2), of which 7.1 square miles (18.4 km2) is land and 0.12 square miles (0.3 km2), or 1.52%, is water.