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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| League | Level | From-To | Parent League |
|---|---|---|---|
| Tolkien Baseball | MLB | 2003-2051 | |
| SGCBL Triple A | AAA | 2013-2051 | Tolkien Baseball |
| SGCBL Double A | AA | 2013-2051 | Tolkien Baseball |
| SGCBL High A | A+ | 2013-2051 | Tolkien Baseball |
| SGCBL College I | COL | 2018-2045 | Tolkien Baseball |
| SGCBL College II | COL | 2018-2045 | Tolkien Baseball |
| SGCBL High School A | HS | 2018-2045 | Tolkien Baseball |
| SGCBL High School B | HS | 2018-2045 | Tolkien Baseball |
| SciFi and Fantasy League | MLB | 2024-2051 | |
| SFL Triple A | AAA | 2024-2051 | SciFi and Fantasy League |
| SGCBL Low A | A | 2046-2051 | Tolkien Baseball |
| SGCBL Rookie League | R | 2046-2051 | Tolkien Baseball |
| Middle Earth Independent League | MLB | 2046-2051 | |
| SGCBL College | COL | 2046-2051 | Tolkien Baseball |
| SGCBL High School | HS | 2046-2051 | Tolkien Baseball |
| SGCBL Junior College | JUCO | 2046-2051 | Tolkien Baseball |
