The state highway heads southeast as a two-lane undivided road through farmland to the village of Marston, where the highway turns east at a three-way junction with South Marston Road.

East of Marston, MD 407 veers southeast and passes through the hamlet of Dennings.

The state highway reaches its eastern terminus at MD 27 (Ridge Road) north of Taylorsville.

The roadway continues southeast as county-maintained Baker Road, which leads to the historic McMurray-Frizzell-Aldridge Farm.

[3] That section and a second segment to west of Dennings were completed as a concrete road by 1933.