Amherst is an unincorporated community in Marshall County, South Dakota, United States.
History A post office called Amherst was established in 1887. The community most likely takes its name from Amherst, Massachusetts.
Approximately two and half miles southeast of the village a rupture of the Keystone Pipeline caused what is being called the largest oil spill in South Dakota history on November 16, 2017.Schmidt, Kayleigh. (17 November 2017). "Landowner near Keystone Pipeline leak says he isn't surprised". KSFY website Retrieved 18 November 2017. The spill is an area about 100 yards in radius within a conservation reserve field about a mile east of 416 Avenue south of the village.Marvel, Shannon. (18 November 2017). "TransCanada: 'This is our responsibility, plain and simple' ". Aberdeen News website Retrieved 18 November 2017.
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