Idaho-Washington League was an Independent league that played from 1931 to 1936
1925 Coeur d'Alene Id, Spokane The Eagles Wa, Spokane Sad Slim Smith Wa, Spokane Upstairs Price Wa,
1926 No teams enter or left the league.
1927 Spokane Mines enter the league.
1933 Coeur d'Alene Id, Spokane Miners, Spokane Sad Slim Smith, Spokane Travelers
1934 No teams enter or left the league.
1935 Colfax Wa, Lewiston Id, Mason City Wa, Rosalia Wa, Spokane Bakers Wa, Spokane Brewers Wa, Spokane Freighters Wa, Walla Walla Wa
1936 Coeur d'Alene Id and Spokane Silver Loaf Wa enter the league and Spokane Bakers and Spokane Freighters left the league