A portion of Main Street was paved by 1910; the sections south and north of the town center were constructed in the early 1910s and late 1910s, respectively.

MD 808 heads north through residential subdivisions as a two-lane undivided road following the Carroll–Frederick county line on top of a ridge.

[1][2] The unincorporated community of Ridgeville and the town of Mount Airy developed on top of Parr's Ridge, a north–south ridge that separates the Monocacy River watershed and Frederick County to the west from the Patapsco River watershed and Carroll County to the east.

[5] The highway from the center of Mount Airy north through Dorceytown was completed as a 15-foot (4.6 m) wide concrete road in 1920.

[12] The bypass was completed from Ridgeville Boulevard south to the I-70 interchange in 1977; MD 808 was marked on Main Street by 1978.

The state highway follows the Carroll–Frederick county line between its southern terminus and a point south of Sunset Avenue.