Pollock is a town in Campbell County, South Dakota, United States. The population was 224 at the time of the 2020 census. Pollock was laid out in 1901 in anticipation of the arrival of a branch of the Soo Line, and named in honor of a first settler with the last name Pollock. The Pollock Depot, a wood-frame former railroad station, is listed on the National Register …Pollock is a town in Campbell County, South Dakota, United States. The population was 224 at the time of the 2020 census. Pollock was laid out in 1901 in anticipation of the arrival of a branch of the Soo Line, and named in honor of a first settler with the last name Pollock. The Pollock Depot, a wood-frame former railroad station, is listed on the National Register of Historic Places.