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Idaho-Oregon League was an Independent League
1912 Boise Id, Nampa, Id, Ontario Or, Vale Or
1913 Ontario Or, Payette Id, Vale Or, Weiser Id
1914 Ontario Or, Payette Id, Vale Or, Weiser Id
1915 Boise Id, Caldwell Id, Nampa Id, Ontario, Or
1916 Caldwell Id, Nampa Id, Ontario, Or, Payette, Id
1920 Huntington Or, Ontario Or, Parma, Id, Payette Id, Vale, Or, Weiser, id
1930 Nyssa Or, Vale Or, Weiser Id, Wilder ID