Warner is a town in Brown County, South Dakota, United States.

[6] According to the United States Census Bureau, the town has a total area of 0.28 square miles (0.73 km2), all land.

There were 171 housing units at an average density of 610.7 per square mile (235.8/km2).

18.1% of all households were made up of individuals, and 5.4% had someone living alone who was 65 years of age or older.

There were 153 housing units at an average density of 506.6 per square mile (195.6/km2).

The racial makeup of the town was 97.61% White, 1.19% Native American, and 1.19% from two or more races.

19.4% of all households were made up of individuals, and 5.6% had someone living alone who was 65 years of age or older.