Loomis is a census-designated place (CDP) in Davison County, South Dakota, United States.

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

[6] According to the United States Census Bureau, the CDP has a total area of 0.2 square miles (0.52 km2), all land.

There were 19 housing units at an average density of 98.1 per square mile (37.9/km2).

16.7% of all households were made up of individuals, and 5.6% had someone living alone who was 65 years of age or older.