 At one point, the section between MD 30 in Reisterstown and Westminster was to become a part of MD 9, which would continue northwest to Emmitsburg; MD 140 was to be designated between Baltimore and Reisterstown.US 140 was decommissioned on January 1, 1979 and became MD 140 between Baltimore and Westminster; MD 140 also ran along the former alignment of MD 97 between Westminster and Emmitsburg; MD 97 replaced US 140 between Westminster and the Pennsylvania border.MD 140 is signed north–south from US 1 in Baltimore to MD 30 in Reisterstown and east–west from MD 30 to the Pennsylvania state line.