Wentworth is an incorporated village in Lake County, South Dakota, United States.

[7] It is known for being the mailing address of the cabins and vacation homes around Lake Madison, South Dakota.

According to the United States Census Bureau, the village has a total area of 0.25 square miles (0.65 km2), all land.

33.3% of all households were made up of individuals, and 9.3% had someone living alone who was 65 years of age or older.

The racial makeup of the city was 96.81% White, 1.60% Native American, 0.53% Asian, and 1.06% from two or more races.

25.3% of all households were made up of individuals, and 8.4% had someone living alone who was 65 years of age or older.