Cobb Island is a small island located at the confluence of the Potomac River and the Wicomico River in southern Charles County, Maryland in the United States. It is located approximately 45 miles south of Washington, D.C., and is considered to be within the Washington, D.C. MSA. Cobb Island is separated from the mainland by Neale Sound and connected to it by a 0.11-mile-long fixed bridge carrying Maryland Route 254.The unincorporated community and census-designated place of Cobb Island is located on the island. As of the 2010 census, the CDP had a population of 1,166. The community has a small post office, a volunteer fire department and rescue squad, a Baptist church, a large community green space and a small playground for children. Commercially, there are two seafood restaurants with marinas, The Rivah, a marina with a pizzeria restaurant chain, a small bar and grill, a seasonal coffee shop, art gallery & bakery, and a small market.On December 23, 1900, Reginald Aubrey Fessenden sent and received the f