Fort Howard is an unincorporated community and census-designated place in Baltimore County, Maryland,United States. The population was 303 at the 2010 census. The median age is 47.9. 52.86% are female and 47.14 are male. 58.9% are married and 41.1% are single. The average household size is 2.64.According to the United States Census Bureau, the CDP has a total area of .143 square miles , of which .075 square miles is land and .068 square miles,or 47.3 % is water.