Monongahela Valley League was an unlassified league based in Pennsylvania.

1893     Braddock, Duquesne, Homestead, Irwin, Wilkensburg, Wilmerding

1894     Braddock, Duquesne, Homestead, Wilkensburg

1905     Belle Vernon, Brownsville, Charleroi, Donora, Fayette City, Monongahela City

1906 to 1908    Not sure if this league played

1909     Belle Vernon, Brownsville, Donora, Fayette City, Monongahela City, Roscoe

1910 to 1938

1939     Belle Vernon, Charleroi, Donora Hilltops, Donora Zincs, Dunlevy, Fairhope, Monessen Association, Monessen Franks, Monongahela, New Eagle

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