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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Harvey | RP | Los Angeles Lions | 20 | 10/10/1896 | Maywood | USAc | Switch | Right | 174 cm | 145 lbs | - |
| Jackson, Theodore | LF | Free Agent | 30 | 06/03/1887 | Detroit | USAc | Left | Right | 184 cm | 200 lbs | - |
| Janney, Richard | LF | Tacoma Larks | 22 | 05/20/1895 | Lake Mohegan | USAc | Right | Right | 176 cm | 170 lbs | - |
| Jefferson, Charles | SP | Sacramento Miners | 25 | 12/29/1891 | Jersey City | USAc | Right | Right | 192 cm | 200 lbs | $2,500 |
| Jekyll, Alvis | C | Free Agent | 25 | 05/30/1892 | Olney | USAc | Right | Right | 182 cm | 200 lbs | - |
| Jenkins, Ewell | 2B | Oakland Ducks | 26 | 01/25/1891 | Garland | USAc | Right | Right | 176 cm | 185 lbs | $1,500 |
| Johnson, Frank | SP | Spokane Suns | 19 | 05/17/1898 | Madison | USAc | Right | Right | 192 cm | 180 lbs | - |
| Johnson, Isaiah | RF | Seattle Sawyers | 20 | 08/20/1897 | Phoenix | USAc | Left | Left | 183 cm | 175 lbs | - |
| Johnson, Ivan | 1B | Seattle Sawyers | 34 | 07/25/1883 | Louisville | USAc | Right | Right | 179 cm | 200 lbs | $1,800 |
| Johnson, James | SS | Spokane Suns | 22 | 12/01/1894 | Lumberton | USAc | Switch | Right | 179 cm | 180 lbs | - |
| Jones, Doyle | RP | Oakland Ducks | 20 | 04/15/1897 | Springfield | USAc | Left | Left | 180 cm | 155 lbs | - |
| Joplin, John | SP | Tacoma Larks | 24 | 12/05/1892 | Yakima | USAc | Right | Right | 180 cm | 180 lbs | - |
| Joplin, Judge | 1B | Los Angeles Lions | 28 | 11/26/1888 | Cleveland | USAc | Right | Right | 191 cm | 215 lbs | $2,500 |
