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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 |
|---|---|---|---|---|---|---|---|---|---|
| Donald Jackson | 2035-2035 | .000 | 0 | 0 | 3 | 2 | 0 | 4.46 | 32 |
| Franklin Jackson | 2005-2015 | .251 | 203 | 655 | 0 | 0 | 0 | 0.00 | 0 |
| John Jackson | 2020-2025 | .188 | 7 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Jackson | 2018-2021 | .160 | 0 | 5 | 14 | 29 | 1 | 5.95 | 240 |
| Steven Jackson | 2015-2018 | .235 | 18 | 86 | 0 | 0 | 0 | 0.00 | 0 |
| John Jacobs | 2012-2020 | .274 | 99 | 421 | 0 | 0 | 0 | 0.00 | 0 |
| Manuel Jaimes | 2027-2033 | .270 | 26 | 183 | 0 | 0 | 0 | 0.00 | 0 |
| Matthew James | 2033-2035 | .226 | 14 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Floyd Janik | 2005-2013 | .087 | 3 | 10 | 38 | 30 | 2 | 5.38 | 400 |
| Jorge Jaquez | 2015-2019 | .284 | 29 | 213 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Jaramillo | 2032-2034 | .000 | 0 | 0 | 1 | 2 | 0 | 4.37 | 15 |
| Ricardo Jasso | 2002-2005 | .272 | 59 | 322 | 0 | 0 | 0 | 0.00 | 0 |
| John Jellison | 2017-2018 | .217 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Greg Jenkins | 2025-2035 | .178 | 0 | 4 | 109 | 65 | 5 | 4.51 | 1170 |
| Joe Jenkins | 2035-2035 | .296 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Kieran Jenkins | 2029-2034 | .000 | 0 | 0 | 29 | 56 | 1 | 5.38 | 642 |
| Luis Jeon | 2005-2024 | .253 | 665 | 1900 | 0 | 0 | 0 | 0.00 | 0 |
| Wayne Jester | 2002-2007 | .253 | 108 | 424 | 0 | 0 | 0 | 0.00 | 0 |
| Vicente Jiménez | 2028-2028 | .158 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Tommy Johns | 2022-2026 | .259 | 3 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Johnson | 2002-2012 | .265 | 63 | 315 | 0 | 0 | 0 | 0.00 | 0 |
| Frank Johnson | 2019-2024 | .211 | 4 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Harry Johnson | 2009-2015 | .222 | 2 | 4 | 14 | 19 | 3 | 5.52 | 169 |
| Henry Johnson | 2014-2014 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Justin Johnson | 2021-2024 | .240 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| James Johnstone | 2013-2019 | .200 | 3 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Cullen Jones | 2024-2026 | .111 | 0 | 0 | 2 | 3 | 0 | 6.66 | 24 |
| Don Jones | 2034-2035 | .000 | 0 | 0 | 2 | 7 | 1 | 5.68 | 111 |
| Don Jones | 2028-2035 | .265 | 261 | 700 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Jones | 2023-2029 | .267 | 31 | 176 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Fred Jones | 2018-2018 | .143 | 0 | 0 | 0 | 4 | 0 | 8.36 | 7 |
| Glenn Jones | 2026-2028 | .000 | 0 | 0 | 2 | 1 | 0 | 7.02 | 18 |
| Jeff Jones | 2024-2026 | .435 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Jones | 2002-2010 | .154 | 1 | 6 | 39 | 39 | 72 | 4.13 | 421 |
| Steve Jones | 2020-2035 | .313 | 429 | 1463 | 0 | 0 | 0 | 0.00 | 0 |
| Von Jones | 2032-2035 | .305 | 2 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Brian Josephson | 2005-2010 | .020 | 0 | 0 | 10 | 20 | 17 | 5.34 | 226 |
| Eisuke Jouda | 2021-2021 | .195 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Katsuhiko Jouda | 2021-2033 | .309 | 333 | 1084 | 0 | 0 | 0 | 0.00 | 0 |
| Josias Juarez | 2009-2014 | .236 | 16 | 97 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Jurgens | 2002-2008 | .091 | 1 | 24 | 102 | 64 | 0 | 3.36 | 1125 |
| Razan Juro | 2015-2017 | .216 | 10 | 72 | 0 | 0 | 0 | 0.00 | 0 |
