| 1 | PBX | Barrett Division, Allied Chemical Corp. | added 7/1958; eliminated 1/1959 | | NAKINA |
| 2 | PBX | Barrett Division, Allied Chemical & Dye Corp. | added 1/1954; 7/1954-10/1957; eliminated 7/1958 | | NAKINA |
| 3 | PBX | Barrett Division, Allied Chemical & Dye Corp. | 10/57; eliminated 7/58 | | NRHS |
| 4 | PBX | Barrett Division, Allied Chemical Corp. | added 7/58; eliminated 1/59 | | NRHS |
| 5 | PBX | BARRETT DIV. (ALLIED CHEMICAL & DYE CORP.) | | | PWRC |
| 6 | PBXD | PRO BOX DELIVERY SERVICE | | | SCAC4 |
| 7 | PBXI | P B EXPRESS INC | | | SCAC4 |
| 8 | PBXL | POTTER BULK TRANSPORT LLC | | | SCAC4 |
| 9 | PBXU | PREMIER BOX PTY LTD | | AUS | BIC |