| 1 | GRI | Air Cargo Center | | STP | AVCODES |
| 2 | GRI | Air Cargo Center | | | ICAO1 |
| 3 | GRI | GOODWIN RAILROAD CORP. | | | PWRC |
| 4 | GRI | GOLDEN RING TRAVEL & TRANSPORTATION | | | SCAC4 |
| 5 | GRIC | GRIFFIN, CLINTON JEFFERY | | | SCAC4 |
| 6 | GRIE | GRIESER LOGISTICS LLC | | | SCAC4 |
| 7 | GRIE | Griesar Reisen GmbH | | D | TRAFFIC |
| 8 | GRIG | GRIGGS, J. D | | | SCAC1 |
| 9 | GRIH | GREEN, RICHARD W LLC | | | SCAC4 |
| 10 | GRIJ | GRIMM, JOHN S | | | SCAC1 |
| 11 | GRIK | GULFSTREAM AIR CHARTER INC | | | SCAC4 |
| 12 | GRIL | GARRONI INTERNATIONAL LOGISTICS COR | | | SCAC4 |
| 13 | GRIMCT | Grimsby Corporation Transport | | GB | TRAFFIC |
| 14 | GRIN | Great Plains Ry. Co. | added 10/1974; 1/1975; eliminated 4/1976 | | NAKINA |
| 15 | GRIN | Great Plains Ry. Co. | added 10/74; 1/75; eliminated 4/76 | | NRHS |
| 16 | GRIN | GREAT PLAINES RAILWAY CO. | | | PWRC |
| 17 | GRIO | GARDNER TRUCKING LLC | | | SCAC4 |
| 18 | GRIP | GRAYON INDUSTRIAL PRODUCTS INC | | | SCAC4 |
| 19 | GRIQ | GOLDEN HARVEST TRANSPORTATION | | | SCAC4 |
| 20 | GRIR | G R INLAND INC | | | SCAC4 |
| 21 | GRIRO | GRIRO S.A. | | RO | TRAFFIC |
| 22 | GRIRO | GRIRO SA | | RO | VKM |
| 23 | GRIS | GRISSINGER, LEE A JR INC | | | SCAC4 |
| 24 | GRIT | GRITTS MIDWAY GREENHOUSE LLC | | | SCAC4 |
| 25 | GRIU | MAERSK A/S | | DK | BIC |
| 26 | GRIU | GRIMALDI GILNAVI LINE | | | SCAC1 |
| 27 | GRIU | GRANDI TRAGHETTI S P A DI NAVIGAZIO | | | SCAC4 |
| 28 | GRIV | Gauley River R.R., L.L.C. | 7/2000-7/2005 | | NAKINA |
| 29 | GRIV | Gauley River R.R., L.L.C. | Jul-00 | | NRHS |
| 30 | GRIV | GAULEY RIVER RAILROAD LLC | | | PWRC |
| 31 | GRIV | Gauley River Railroad | | | RSRV |
| 32 | GRIV | GREEN, BOB TRUCKING | | | SCAC4 |
| 33 | GRIV | Grivita workshop | | RO | TRAFFIC |
| 34 | GRIX | General Recycling Ltd. | added 7/2003; eliminated 10/2003; 7/2005 (not listed) | | NAKINA |
| 35 | GRIX | Gulf Railcar, Inc. | added 1/1991; eliminated 4/1991 | | NAKINA |
| 36 | GRIX | Gulf Railcar, Inc. | added 1/91; eliminated 4/91 | | NRHS |
| 37 | GRIX | *GULF RAILCAR, INC. | | | PWRC |
| 38 | GRIX | +GENERAL RECYCLING LTD. | | | PWRC |
| 39 | GRIX | GENERAL RECYCLING LTD | | | SCAC4 |
| 40 | GRIY | GRIFFIN LOGISTICS LLC | | | SCAC4 |
