 The first segment of MD 118 to be constructed as a modern road was from Middlebrook Road north of Germantown to Frederick Road at Neelsville, which was built as a macadam road by Montgomery County with state aid by 1910.The macadam road was extended south to what is today the MD 117 intersection in what was called Old Germantown in 1923.MD 118 was extended south as a concrete road from Old Germantown to Black Rock Road in 1930.