| 1 | SLG | Saskatchewan Government Air Ambulance Service | Callsign: Lifeguard, | CDN | AVCODES |
| 2 | SLG | Saskatchewan Government | | | ICAO1 |
| 3 | SLG | Spitzke Logistik GmbH | Großenbeeren | D | privat-bahn.de |
| 4 | SLG | Spitzke Logistik GmbH | | DE | VKM |
| 5 | SLGB | STALLINGS BROS INC | | | SCAC4 |
| 6 | SLGF | SCHLAUGIES FUEL OIL SERVICE INC | | | SCAC4 |
| 7 | SLGG | Sidney & Lowe R.R., Inc. | added 10/1983; eliminated 4/1989; eliminated 4/1991; added 7/1992; 1/1994; eliminated 4/1997 | | NAKINA |
| 8 | SLGG | Progress Rail Services Corp. d/b/a Sidney & Lowe R.R., Inc. | added 4/1997; 7/2000-7/2005 | | NAKINA |
| 9 | SLGG | Sidney & Lowe R.R., Inc. | added 10/83; eliminated 4/89; eliminated 4/91; added 7/92; 1/94; eliminated 4/97 | | NRHS |
| 10 | SLGG | Progress Rail Services Corp. d/b/a Sidney & Lowe R.R., Inc. | added 4/97; 7/2000 | | NRHS |
| 11 | SLGG | PROGRESS RAIL SERVICES CORP. d/b/a SIDNEY & LOWE RAILROAD, INC. | | | PWRC |
| 12 | SLGG | Sidney and Lowe Railroad | | | RSRV |
| 13 | SLGG | SIDNEY & LOWE RAILROAD | | | SCAC4 |
| 14 | SLGG | Sidney & Lowe | | USA | TRAFFIC |
| 15 | SLGJ | STERLING LG SOLUTIONS | | | SCAC4 |
| 16 | SLGK | SELECT LOGISTICS NETWORK INC | | | SCAC4 |
| 17 | SLGM | SATTERWHITE LOG HOMES | | | SCAC4 |
| 18 | SLGO | STERLING CORPORATION | | | SCAC4 |
| 19 | SLGQ | SECA LOGISTICS LLC | | | SCAC4 |
| 20 | SLGR | STAR LOGISTICS GROUP INC | | | SCAC4 |
| 21 | SLGS | SOURCE LOGISTICS INC | | | SCAC4 |
| 22 | SLGT | STEEL LOGISTICS INC | | | SCAC4 |
| 23 | SLGW | Salt Lake, Garfield and Western Ry. Co. | 1/1975-1/1980; eliminated 4/1989; 1/1994-7/2005 | | NAKINA |
| 24 | SLGW | Salt Lake, Garfield and Western Ry. Co. | 1/75-1/80; eliminated 4/89; 1/94-7/2000 | | NRHS |
| 25 | SLGW | SALT LAKE, GARFIELD & WESTERN RWY. | | | PWRC |
| 26 | SLGW | Salt Lake, Garfield and Western Railway | | | RSRV |
| 27 | SLGX | St. Louis County Gas Co. | 7/1923 | | NAKINA |
| 28 | SLGX | Louis E. & Simon Seley | 1/1941 | | NAKINA |
| 29 | SLGX | *ST. LOUIS COUNTY GAS CO. | | | PWRC |
| 30 | SLGX | *LOUIS E. & SIMON SELEY | | | PWRC |
| 31 | SLGY | SHERIDAN LIGHTING SYSTEMS INC | | | SCAC4 |