Pennsylvania–Ohio–Maryland League
The class D Pennsylvania–Ohio–Maryland League began in 1906. By 1908, however, this baseball minor league was extinct. Cumberland, Maryland dropped out after 1906, leaving Maryland unrepresented in 1907. West Virginia was in the loop for about three weeks when Butler moved to Piedmont, West Virginia, but the team moved on to Charleroi, Pennsylvania.Cities represented
- Braddock, Pennsylvania: Braddock Infants 1906-1907
- Butler, Pennsylvania: Butler Bucks 1906
- Charleroi, Pennsylvania: Charleroi 1906-1907
- Cumberland, Maryland: Cumberland Giants 1906
- East Liverpool, Ohio: East Liverpool 1906-1907
- McKeesport, Pennsylvania: McKeesport Tubers 1907
- Piedmont, West Virginia: Piedmont 1906
- Steubenville, Ohio: Steubenville Stubs 1906-1907
- Uniontown, Pennsylvania: Uniontown Coal Barons 1906-1907
- Washington, Pennsylvania: Washington 1906-1907
- Waynesburg, Pennsylvania: Waynesburg 1906
- Zanesville, Ohio: Zanesville 1907
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