MD 75 was originally constructed through Linwood in the early 1920s.

MD 800D begins at a perpendicular intersection with MD 75 (Green Valley Road) a short distance west of Linwood.

The state highway heads north as a two-lane undivided road then turns east at a spur of old alignment that serves a farm.

[3][4] The sections of roadway received their modern designations after MD 75 was relocated between Union Bridge and New Windsor around 1963.

[5] The entire route is in Linwood, Carroll County.