Mason Benson Club: A non-profit organization of residents of Mason or Benson Lakes or individuals who use property at one of the lakes.
Mason County Emergency Communications: Provides information about volunteer radio communications clubs meeting in Belfair and Shelton.
Mason County Senior Activities Association: Provides Mason County's senior citizens with events, activities, companionship, food service, and referrals.
Volunteer Center of Lewis, Mason, and Thurston Counties: They dispatch emergency volunteers, collaborates on community projects, and matches volunteers with agencies.