| 1 | GSC | Golden State Airlines, Inc. | Callsign: Golden State, ICAO designator changed to GOL | USA | AVCODES |
| 2 | GSC | Grandstar Cargo International Airlines Co., Ltd | IATA: GD, Callsign: Grandstar Cargo, Founded in 2008. Ceased operations in May 2012. | PRC | AVCODES |
| 3 | GSCB | GAGNE & SON CONCRETE BLOCKS INC | | | SCAC4 |
| 4 | GSCD | GRAND SHIPPING CO LTD | | | SCAC4 |
| 5 | GSCE | G S C ENTERPRISES INC | | | SCAC4 |
| 6 | GSCH | GARDEN STATE CONTAINER HAULAGE INC | | | SCAC4 |
| 7 | GSCH | Geiger und Schüle Bau GmbH | | DE | VKM |
| 8 | GSCHW | Verkehrsbetriebe Gschwindl | | A | TRAFFIC |
| 9 | GSCM | GASCHEM SERVICES GMBH & CO KG | | | SCAC4 |
| 10 | GSCO | GULF SHIPPING COMPANY | | | PWRC |
| 11 | GSCO | GSC LOGISTICS INC | | | SCAC4 |
| 12 | GSCP | GARDENSCAPE TRANSPORT INC | | | SCAC4 |
| 13 | GSCQ | GRIMES SUPPLY CHAIN SERVICES INC | | | SCAC4 |
| 14 | GSCR | GULF STAR CONTRACTING | | | SCAC4 |
| 15 | GSCS | GRAEBEL/SOUTH CAROLINA MOVERS INC | | | SCAC4 |
| 16 | GSCT | GROUP TRANSPORT INC | | | SCAC4 |
| 17 | GSCU | GSM TANK CONTAINER CANARIAS, S.L. | | E | BIC |
| 18 | GSCU | EUROTAINER U.S., INC. | | | PWRC |
| 19 | GSCU | Eurotainer US | | | RSRV |
| 20 | GSCU | GESCO | | | SCAC4 |
| 21 | GSCV | GREENSTAR STETAMSHIP COMPANY GMBH & | | | SCAC4 |
| 22 | GSCW | Garden State Coachways | | US-NJ | TRAFFIC |
| 23 | GSCX | General American Marks Co. | added 1/2003; 7/2005 | | NAKINA |
| 24 | GSCX | GATX Financial Corp. | added 1/2002; eliminated 1/2003 | | NAKINA |
| 25 | GSCX | GATX/GLC Leasing Corp. | added 4/1985; 1/1994-7/2000; eliminated 1/2002 | | NAKINA |
| 26 | GSCX | Greenville Leasing Co. | added 4/1981; eliminated 4/1985 | | NAKINA |
| 27 | GSCX | Greenlease Co., a Division of Greenville Steel Car Co. | 1/1980; eliminated 4/1981 | | NAKINA |
| 28 | GSCX | Greenville Steel Car Co. | 4/1970-1/1975 | | NAKINA |
| 29 | GSCX | Greenlease Co., a Division of Greenville Steel Car Co. | 10/1966 | | NAKINA |
| 30 | GSCX | Greenville Steel Car | 7/1965 | | NAKINA |
| 31 | GSCX | Greenlease Co., a Division of Greenville Steel Car Co. | added 7/1963 | | NAKINA |
| 32 | GSCX | Gulf States Creosoting Co. | 7/1930-7/1954; eliminated 1/1955 | | NAKINA |
| 33 | GSCX | Gulf States Creosoting Co. | 4/38-1/52 | | NRHS |
| 34 | GSCX | Greenlease Co., a Division of Greenville Steel Car Co. | added 7/63 | | NRHS |
| 35 | GSCX | Greenville Steel Car | Jul-65 | | NRHS |
| 36 | GSCX | Greenlease Co., a Division of Greenville Steel Car Co. | Oct-66 | | NRHS |
| 37 | GSCX | Greenville Steel Car Co. | 4/70-1/75 | | NRHS |
| 38 | GSCX | Greenlease Co., a Division of Greenville Steel Car Co. | 1/80; eliminated 4/81 | | NRHS |
| 39 | GSCX | Greenville Leasing Co. | added 4/81; eliminated 4/85 | | NRHS |
| 40 | GSCX | GATX/GLC Leasing Corp. | added 4/85; 1/94-7/2000 | | NRHS |
| 41 | GSCX | *GULF STATES CREOSOTING CO. | | | PWRC |
| 42 | GSCX | +GENERAL AMERICAN MARKS COMPANY / GREENVILLE LEASING CORPORATION | | | PWRC |
| 43 | GSCX | Greenville Leasing (GATX) | | | RSRV |
| 44 | GSCX | GENERAL AMERICAN MARKS COMPANY | | | SCAC4 |
| 45 | GSCX | GATX Capital Corporation | | USA | TRAFFIC |
| 46 | GSCZ | GURNSEY STONE CO. | | | PWRC |
