Into the 20th century, Hyndman remained relatively unchanged before immediately seeing a decline before 1910. For a brief period, a general store operated after Joseph Hyndman's death in 1901 led to new mill owners, who ran a store accompanying the mill until 1906. At this time, the mills which sustained the community were deemed obsolete and ceased operations, with the buildings being demolished completely by 1907. Sports became increasingly popular in the community in the early 1900s, and an outdoor "arena" was erected in Hyndman on a nearby pond; fees were charged for ice time and organized hockey games against neighbouring community teams were held there. By mid-20th century, the community saw a total decline as all businesses, schools and churches had ceased operations.