Marys River From Wikipedia the free encyclopedia Marys River may refer to: Marys River (Illinois) Marys River (Nevada) Marys River (Oregon) See also[edit] St. Mary's River (disambiguation) Mary River (disambiguation) Topics referred to by the same term This disambiguation page lists articles associated with the title Marys River.If an internal link led you here, you may wish to change the link to point directly to the intended article.