Mount Vernon is a city in Davison County, South Dakota, United States.

[7] It is part of the Mitchell, South Dakota Micropolitan Statistical Area.

The town takes its name from Mount Vernon, the estate of George Washington; an early variant name was Arlandtown.

[8] According to the United States Census Bureau, the city has a total area of 0.35 square miles (0.91 km2), all land.

The racial makeup of the city was 92.6% White, 5.4% Native American, 0.4% Pacific Islander, and 1.5% from two or more races.

The racial makeup of the city was 98.11% White, 0.21% Native American, 1.68% from other races.