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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Jaime Jacinto | 1915-1915 | .244 | 5 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Dominic Jackson | 1914-1914 | .268 | 4 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Henning Jacobsen | 1913-1915 | .263 | 21 | 113 | 0 | 0 | 0 | 0.00 | 0 |
| Gobrías Jaime | 1905-1915 | .278 | 59 | 479 | 0 | 0 | 0 | 0.00 | 0 |
| Jimeno Jaimes | 1914-1915 | .273 | 8 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Taylor James | 1912-1915 | .287 | 20 | 122 | 0 | 0 | 0 | 0.00 | 0 |
| Edmundo Jaramillo | 1901-1903 | .246 | 17 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Saturnín Jaramillo | 1914-1915 | .000 | 0 | 0 | 1 | 1 | 0 | 7.52 | 13 |
| Sebastián Jaso | 1914-1915 | .275 | 8 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Édgar Jaso | 1902-1910 | .301 | 62 | 527 | 0 | 0 | 0 | 0.00 | 0 |
| Benedicto Jaén | 1911-1911 | .270 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Ross Jefferson | 1901-1902 | .000 | 0 | 0 | 6 | 4 | 1 | 4.38 | 39 |
| Ray Jeffery | 1905-1915 | .000 | 0 | 0 | 22 | 19 | 15 | 4.14 | 241 |
| Brendan Jenkins | 1912-1915 | .304 | 5 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Dennehy Jenkins | 1915-1915 | .250 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Rio Jenkins | 1914-1915 | .000 | 0 | 0 | 6 | 11 | 0 | 4.34 | 117 |
| Rick Jerome | 1912-1915 | .000 | 0 | 0 | 10 | 11 | 2 | 4.07 | 173 |
| Adrián Jiménez | 1901-1905 | .000 | 0 | 0 | 74 | 46 | 1 | 3.28 | 390 |
| Aldo Jiménez | 1915-1915 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Amadís Jiménez | 1915-1915 | .239 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Ananías Jiménez | 1907-1913 | .000 | 0 | 0 | 30 | 24 | 63 | 2.33 | 304 |
| Esdras Jiménez | 1903-1911 | .278 | 60 | 398 | 0 | 0 | 0 | 0.00 | 0 |
| Fermín Jiménez | 1915-1915 | .296 | 2 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Jiménez | 1913-1913 | .000 | 0 | 0 | 1 | 1 | 2 | 0.46 | 20 |
| Rodrigo Jiménez | 1906-1913 | .242 | 24 | 180 | 0 | 0 | 0 | 0.00 | 0 |
| Rosario Jiménez | 1901-1902 | .284 | 1 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Rosario Jiménez | 1901-1912 | .000 | 0 | 0 | 47 | 45 | 3 | 3.62 | 441 |
| Tito Jiménez | 1906-1913 | .282 | 50 | 271 | 0 | 0 | 0 | 0.00 | 0 |
| Hubert Jirka | 1914-1914 | .000 | 0 | 0 | 0 | 1 | 0 | 10.12 | 1 |
| Matt Johnson | 1914-1914 | .000 | 0 | 0 | 5 | 3 | 4 | 2.32 | 27 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Bill Johnston | 1914-1914 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Laurent Joly | 1915-1915 | .162 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Jones | 1912-1912 | .110 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Heath Jones | 1901-1912 | .257 | 45 | 269 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Jones | 1912-1913 | .175 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Leandro Jorgensen | 1914-1915 | .229 | 1 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel José | 1901-1913 | .285 | 53 | 473 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Juma | 1913-1915 | .000 | 0 | 0 | 18 | 14 | 0 | 3.16 | 260 |
| Willi Junker | 1913-1913 | .000 | 0 | 0 | 0 | 0 | 0 | 4.50 | 3 |
| Jesús Justiniano | 1914-1915 | .230 | 13 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Admeto Juárez | 1903-1915 | .252 | 43 | 217 | 0 | 0 | 0 | 0.00 | 0 |
| Vicente Juárez | 1906-1912 | .243 | 19 | 143 | 0 | 0 | 0 | 0.00 | 0 |
