Maryland Route 224 (MD 224) is a state highway in the U.S. state of Maryland. The highway runs 26.70 miles (42.97 km) from MD 6 at Riverside north to MD 227 at Pomonkey. MD 224 is a C-shaped route that mostly parallels the Potomac River through southwestern Charles County. The northern part of the highway passes through the villages of Chicamuxen, Rison, Marbury, and Mason Springs on the south side of Mattawoman Creek. MD 224 originally included Livingston Road north from Pomonkey through Accokeek, Piscataway, and Oxon Hill in southwestern Prince George's County to Washington. This highway connected Washington with Fort Washington and the Naval Proving Ground at Indian Head.