Long Hollow is an unincorporated community and census-designated place in Roberts County, South Dakota, United States.

Its population was 265 as of the 2020 census.

[4] According to the U.S. Census Bureau, the community has an area of 14.550 square miles (37.68 km2); 14.432 square miles (37.38 km2) of its area is land, and 0.118 square miles (0.31 km2) is water.

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