[1] In May 1905, eleven teams joined the Protective Association of Independent Clubs, which formed the basis of the Class C Division Ohio–Pennsylvania League.
[1] Ultimately, the league trimmed down to eight teams from the following cities: Akron, Newark, Niles, Youngstown, and Zanesville in Ohio, and Homestead, Lancaster, and Sharon in Pennsylvania.
[2] That September, the Youngstown Ohio Works won the league championship, although sources disagree on the team's final record.
[1] Baseball luminaries who were once connected to the league include Billy Evans,[3] Lee Fohl,[4] Bill Phyle,[4] and Everett Scott.
[5] Future Hall-of-Fame infielder George Sisler signed his first professional contract with an Akron club associated with the O-P League, although he never actually played for the team.