St. John Cemetery is a Catholic cemetery located in Prairie Township, Union County, South Dakota. The cemetery is one of four adjacent cemeteries, which are a mile south and a mile east of Beresford, South Dakota. Of these four, St. John is the cemetery which is farthest west. The earliest known burial is that of a child named Felix Phillip Mangan in 1886. As of 2001, the remains of more than 700 individuals were interred at St.