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
1921 Huntington, Or, Parma Id, Payette Id, Vale Or
1922 - Huntington, Or, Nyssa Or, Ontario, Or, Vale Or
1923 to 1929 Not sure if this League played
1930 Nyssa Or, Vale Or, Weiser Id, Wilder ID
1931 - Huntington, Or, Nyssa Or, Ontario, Or, Vale Or
1932 - Boise Id, Emmett Id, Nampa Id, Nyssa, Or, Ontario, Or
1933 - Baker Or, Boise Id, Caldwell, Id, Nampa Id, Nyssa, Or, Ontario, Or
1934 - Boise Id, Caldwell Id, Emmett Id, Middleton Id, Nampa Id, Nyssa, Or, Ontario, Or, Parma Id
1935 - Boise Id, Caldwell Id, Emmett Id, Middleton Id, Nampa Id, Nyssa, Or, Ontario, Or, Payette Id
1936 - Nyssa, Or, Ontario, Or, Payette Id, Vale Or
1937 - Boise Id, Caldwell Id, Emmett Id, Nyssa Or, Ontario Or, Payette Id, Vale Or, Weiser Id
1938 - Baker Or, Boise Id, Caldwell Id, Nyssa Or, Ontario Or, Payette Id, Vale Or, Weiser Id
1939 - Boise Id, Caldwell Id, Nampa Id, Nyssa Or, Ontario Or, Payette Id, Vale Or, Weiser Id
1947 - Burns Or, Homedale Id, Nampa Id, Nyssa Or, Ontario Or, Payette Id, Vale, Or, Wilder, Id
1948 - Burns Or, Homedale Id, Nampa Id, Nyssa Or, Ontario Or, Payette Id, Vale, Or, Wilder, Id