| 4701 | GRC | Ghana Railway Corporation | | GH | TRAFFIC |
| 4702 | GRCC | GRANITE CONSTRUCTION COMPANY | | | SCAC4 |
| 4703 | GRCF | GARCIA ASTORGA, ABEVARDO | | | SCAC4 |
| 4704 | GRCG | GREEN CHARTERING ASMIND NORWAY | | | SCAC1 |
| 4705 | GRCG | GREEN CHARTERING A/S | | | SCAC4 |
| 4706 | GRCI | GRACE TRANSPORT INC | | | SCAC4 |
| 4707 | GRCJ | GARCIA CORTEZ, JOEL SA DE CV | | | SCAC4 |
| 4708 | GRCK | GARCIA, F TRANSPORT | | | SCAC4 |
| 4709 | GRCL | GRACE LINES INC | | | SCAC4 |
| 4710 | GRCM | GREEN & CHAPMAN INC | | | SCAC4 |
| 4711 | GRCN | GRACE TRANSPORT INC | | | SCAC4 |
| 4712 | GRCR | GARCIA RECYCLING CENTER & METALS IN | | | SCAC4 |
| 4713 | GRCU | BORCHARD LINES LTD | | GB | BIC |
| 4714 | GRCU | GRACECHURCH CONTAINER LINE LTD | | | SCAC4 |
| 4715 | GRCV | GREEN LINE EXPRESS SERVICES INC | | | SCAC4 |
| 4716 | GRCX | Granite Rock Co. | added 1/1971; 1/1975-1/1994; 7/2000-7/2005 (not listed) | | NAKINA |
| 4717 | GRCX | Warren Petroleum Corp. | 4/1961 | | NAKINA |
| 4718 | GRCX | Gulf Oil Corp. | eliminated 7/1961 | | NAKINA |
| 4719 | GRCX | Gulf Refining Co. | 8/1920-7/1935 | | NAKINA |
| 4720 | GRCX | Gulf Oil Corp. | 7/1937-10/1957 | | NAKINA |
| 4721 | GRCX | Gulf Oil Corp. | 4/38-10/57 | | NRHS |
| 4722 | GRCX | Warren Petroleum Corp. | Apr-61 | | NRHS |
| 4723 | GRCX | Granite Rock Co. | added 1/71; 1/75-7/2000 | | NRHS |
| 4724 | GRCX | *GULF OIL CORP. [WARREN PETROLEUM CORP.; GULF REFINING CO.] | | | PWRC |
| 4725 | GRCX | +GRANITE ROCK CO. | | | PWRC |
| 4726 | GRCX | Granite Rock | | | RSRV |
| 4727 | GRCX | GRANITE ROCK CO. | | | SCAC4 |
| 4728 | GRCZ | GRANITE CITY STEEL | | | PWRC |
| 4729 | GRD | National Grid Co plc | Callsign: Grid, | GB | AVCODES |
| 4730 | GRD | National Grid | | | ICAO1 |
| 4731 | GRDB | GAEBEL MICHIGAN MOVERS INC | | | SCAC4 |
| 4732 | GRDD | GARDNER OIL INC | | | SCAC4 |
| 4733 | GRDE | GALLEGOS ROMAN, DORA ALICIA | | | SCAC4 |
| 4734 | GRDI | GUERRERO, ROLANDO INC | | | SCAC4 |
| 4735 | GRDK | GRUPO INDUSTRIAL DE SISTEMA DE CONF | | | SCAC4 |
| 4736 | GRDL | GORDON LOGISTICS LLC | | | SCAC4 |
| 4737 | GRDN | GARDNER GAS HAULING INC | | | SCAC4 |
| 4738 | GRDO | GRAND UNION CO | | | SCAC4 |
| 4739 | GRDQ | GREEN, DENNIS & SONS | | | SCAC4 |
| 4740 | GRDS | GERALDOS TRUCKING CORP | | | SCAC4 |
| 4741 | GRDT | GARDNER TRANSPORT LLC | | | SCAC4 |
| 4742 | GRDU | TOUAX GROUP | | F | BIC |
| 4743 | GRDU | GOLD CONTAINER CORP | | | SCAC4 |
| 4744 | GRDW | GRANT, DAVE, HAY, INC | | | SCAC1 |
| 4745 | GRDW | GRANT, DAVE R HAY INC | | | SCAC4 |
| 4746 | GRDX | Grand River Dam Authority | added 10/1978; eliminated 4/1979; added 1/1981; 1/1994-7/2000; eliminated 7/2001; 7/2005 (not listed) | | NAKINA |
| 4747 | GRDX | Grand River Dam Authority | added 10/78; eliminated 4/79; added 1/81; 1/94-7/2000; eliminated 7/2001 | | NRHS |
| 4748 | GRDX | GRAND RIVER DAM AUTHORITY | | | PWRC |
| 4749 | GRDX | Grand River Dam Authority | | | RSRV |
| 4750 | GRDX | GRAND RIVER DAM AUTHORITY | | | SCAC4 |
| 4751 | GRE | Southeast European Airlines | IATA: 6J, Callsign: Seea Air, Ceased operations | GR | AVCODES |
| 4752 | GRE | Greece Airways | Callsign: Greece Airways, | GR | AVCODES |
| 4753 | GRE | Greenlandcopter A/S | | GRO | AVCODES |
| 4754 | GRE | Air Scotland | | | ICAO1 |
| 4755 | GREA | GREATLAND TRANSPORT INC | | | SCAC4 |
| 4756 | GREA | Grand Rapids Eastern | Real: GR | USA | TRAFFIC |
| 4757 | GREB | GREGG DRILLING AND TESTING INC | | | SCAC4 |
| 4758 | GREC | GEORGETOWN RAIL EQUIPMENT CO | | | SCAC4 |
| 4759 | GRED | GREGG TRUCKING | | | SCAC4 |
| 4760 | GREI | GREEN ISLAND TRANSPORT LTD | | | SCAC4 |
| 4761 | GREJ | GLOBAL RELOGISTICS INC | | | SCAC4 |
| 4762 | GREL | GREEN MOTOR LINES INCORPORATED | | | SCAC4 |
| 4763 | GREM | GREMILLION TRUCKING INC | | | SCAC4 |
| 4764 | GREN | | Real: TAG, City: Grenoble | F | TRAFFIC |
| 4765 | GREO | GFS TRANSPORTATION INC | | | SCAC4 |
| 4766 | GREP | GREYHOUND EXPOSITION SERVICES, Las Vegas Convention Service Co | | | SCAC1 |
| 4767 | GREU | M.A. GRENDI DAL 1828 S.P.A. | | I | BIC |
| 4768 | GREU | Greuter AG | | CH | TRAFFIC |
| 4769 | GREW | GREWAL BROS TRUCKING | | | SCAC4 |
| 4770 | GREX | Georgetown Rail Equipment Co. | 1/1994 (not listed); added 7/1998; 7/2000-7/2005 | | NAKINA |
| 4771 | GREX | Georgetown Rail Equipment Co. | 1/94; added 7/98; 7/2000 | | NRHS |
| 4772 | GREX | GEORGETOWN RAIL EQUIPMENT COMPANY | | | PWRC |
| 4773 | GREX | Georgetown Rail Equipment | | | RSRV |
| 4774 | GREX | GEORGETOWN RAIL EQUIPMENT COMPANY | | | SCAC4 |
| 4775 | GREY | GREYSTONE LOGISTICS | | | SCAC4 |
| 4776 | GREYH | Greyhound | | USA | TRAFFIC |
| 4777 | GRF | Aerogryf Ltd. | Callsign: Aerogryf, | PL | AVCODES |
| 4778 | GRF | Gryphon Airlines SA (Pty) Ltd | IATA: Y3, Callsign: Simba, Designator Y3 recalled by IATA. | ZA | AVCODES |
| 4779 | GRF | Gryphon Airlines SA (Pty) Ltd | Callsign: Simba, Designator Y3 recalled by IATA. | ZA | AVCODES |
| 4780 | GRFA | GERICO FOREST PRODUCTS LTD | | | SCAC4 |
| 4781 | GRFB | G T B TRUCKING INC | | | SCAC4 |
| 4782 | GRFC | GRIFFITH ENERGY SERVICES INC | | | SCAC4 |
| 4783 | GRFF | Georgia & Florida R.R. Co., Inc. | 7/2000-7/2005 | | NAKINA |
| 4784 | GRFF | Georgia & Florida R.R. Co., Inc. | Jul-00 | | NRHS |
| 4785 | GRFF | GEORGIA & FLORIDA RAILROAD CO., INC. | | | PWRC |
| 4786 | GRFF | Georgia and Florida Railroad | | | RSRV |
| 4787 | GRFH | GREGORY TRUCK BROKERAGE LLC | | | SCAC4 |
| 4788 | GRFI | GRIFFIN BEVERAGE COMPANY | | | SCAC4 |
| 4789 | GRFL | GRIFFITH ENERGY | | | SCAC4 |
| 4790 | GRFN | GRIFFIN ENTERPRISES LLC | | | SCAC4 |
| 4791 | GRFS | GUTIERREZ REFRIGUERADOS | | | SCAC4 |
| 4792 | GRFU | GATEWAY RAIL FREIGHT LIMITED | | IND | BIC |
| 4793 | GRFU | GATEWAY RAIL FREIGHT LIMITED | | | SCAC4 |
| 4794 | GRFV | GARCIA FLORES, EDGAR | | | SCAC4 |
| 4795 | GRFZ | GRAND FORK MILLING | | | PWRC |
| 4796 | GRG | Trans Air Georgia | IATA: 5I, IATA Prefix: 936, Name changed to Air G | GE | AVCODES |
| 4797 | GRG | Air G | IATA: 5I, IATA Prefix: 936, Designator 5I recalled by IATA. Name changed from Trans Air Georgia | GE | AVCODES |
| 4798 | GRG | Air Georgia | IATA: DA | | ICAO1 |
| 4799 | GRG | Global Rail Groupe | | FAN | TRAFFIC |
| 4800 | GRGB | GEORGALLAS, JOHN BANANA DISTRIBUTOR | | | SCAC4 |
