| 1 | SLC | Swiftlines Limited | Callsign: Swiftlines, | EAK | AVCODES |
| 2 | SLC | Salsa D'Haiti | IATA: SO, Ceased operations | RH | AVCODES |
| 3 | SLC | San Luis Central R.R. | 1/1941-7/1954 | | NAKINA |
| 4 | SLC | The San Luis Central R.R. Co. | 1/1975-7/2005 | | NAKINA |
| 5 | SLC | San Luis Central R.R. | Jan-52 | | NRHS |
| 6 | SLC | The San Luis Central R.R. Co. | 1/75-7/2000 | | NRHS |
| 7 | SLC | SAN LUIS CENTRAL RAILROAD CO. | | | PWRC |
| 8 | SLC | San Luis Central Railroad | | | RSRV |
| 9 | SLC | San Luis Central R.R. | | USA | TRAFFIC |
| 10 | SLCA | S & L CARRIERS INC | | | SCAC4 |
| 11 | SLCB | SELECTIVE DISTRIBUTION LLC | | | SCAC4 |
| 12 | SLCD | SCHNEIDER LOGISTICS INC (INTEGRATED | | | SCAC4 |
| 13 | SLCF | SHOWA LINE, LTD. | | | PWRC |
| 14 | SLCF | SPEED LIGHT COURIER & LTL CO INC | | | SCAC4 |
| 15 | SLCF | SALCEF S.p.A. | | IT | VKM |
| 16 | SLCP | SEA LAUNCH COMPANY LLC | | | SCAC4 |
| 17 | SLCR | ST. LOUIS & CHAIN OF ROCKS RAILROAD | | | PWRC |
| 18 | SLCT | SEALAND CONSTRUCTION LTEE | | | SCAC4 |
| 19 | SLCU | SPECTRA TANKTAINER LOGISTICS PTE. LTD | | SGP | BIC |
| 20 | SLCU | *SALT LAKE CITY UNION DEPOT & RAILWAY CO. | | | PWRC |
| 21 | SLCU | *SLC SOCIETE LOCATION CONTAINERS | | | PWRC |
| 22 | SLCU | SLC Societe Location Containers | | | RSRV |
| 23 | SLCU | CONTAINER ASSOCIATION ROTTERDAM BV | | | SCAC4 |
| 24 | SLCW | SLC NATIONWIDE INC | | | SCAC4 |
| 25 | SLCX | *ST. LAWRENCE COUNTY INDUSTRIAL DEVELOPMENT AGENCY | | | PWRC |
| 26 | SLCX | +ST. LAWRENCE CEMENT INC. | | | PWRC |
| 27 | SLCX | ST LAWRENCE CEMENT INC | | | SCAC4 |
| 28 | SLCY | SCHNEIDER LOGISTICS INC (ALLIANCE C | | | SCAC4 |
| 29 | SLCZ | SEABOARD LUMBER CO. | | | PWRC |
