Maryland Route 51 (MD 51) is a state highway in the U.S. state of Maryland. Known for most of its length as Oldtown Road, the state highway runs 25.53 miles (41.09 km) from an interchange with Interstate 68 (I-68) in Cumberland east to the West Virginia state line at the Potomac River, where the highway continues east as West Virginia Route 9 (WV 9) toward Paw Paw.
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