| 1 | ZTLB | ZEPHANIAH TRANSPORT LLC | | | SCAC4 |
| 2 | ZTLC | ZION TRANSPORTATION, LLC | | | SCAC4 |
| 3 | ZTLD | ZUMBA TRANSPORTATION LLC | | | SCAC4 |
| 4 | ZTLK | ZACK TRUCK LINES | | | SCAC4 |
| 5 | ZTLL | Z TRANSPORT & LOGISTICS LLC | | | SCAC4 |
| 6 | ZTLX | Zenith Tank Line | 8/1920 | | NAKINA |
| 7 | ZTLX | Ziol Tank Line | added 7/1973; 1/1975-1/1980; eliminated 1/1991; 1/1994 (not listed); added 7/1999; 7/2000; eliminated 10/2003 | | NAKINA |
| 8 | ZTLX | Ziol Tank Line | added 7/73; 1/75-1/80; eliminated 1/91; 1/94; added 7/99; 7/2000 | | NRHS |
| 9 | ZTLX | *ZENITH TANK LINE | | | PWRC |
| 10 | ZTLX | *ZIOL TANK LINE | | | PWRC |
| 11 | ZTLX | Ziol Tank Line | | | RSRV |
