| 1 | SEM | Cape Central Airways, Inc. | Callsign: Semo, | USA | AVCODES |
| 2 | SEM | Cape Central Airways | | | ICAO1 |
| 3 | SEM | Sächsisches Eisenbahnmuseum Chemnitz-Hilbersdorf e.V. | Chemnitz | D | privat-bahn.de |
| 4 | SEM | Sächsisches Eisenbahnmuseum | City: Chemnitz-Hilbersdorf | D | TRAFFIC |
| 5 | SEM | Sächsisches Eisenbahnmuseum Chemnitz-Hilbersdorf e.V | | DE | VKM |
| 6 | SEMA | SEMAS, E F TRUCKING | | | SCAC4 |
| 7 | SEMAT | SEMAT (Sociedad de Estudios y explotacion de Material Auxiliar de Transportes, S.A | | ES | VKM |
| 8 | SEMB | Semboku Rapid Railway | Semboku Rapid Railway is the railroad route of the Osaka Prefectural Urban Development | J | TRAFFIC |
| 9 | SEMBG | SEM Remont OOD | | BG | VKM |
| 10 | SEME | SEWELL MOTOR EXPRESS, INC | | | SCAC1 |
| 11 | SEME | SEWELL MOTOR EXPRESS CO | | | SCAC4 |
| 12 | SEMF | SEWARD MOTOR FREIGHT | | | SCAC4 |
| 13 | SEMI | SEA MATES INTERNATIONAL | | | SCAC1 |
| 14 | SEMI | SEAMATE | | | SCAC4 |
| 15 | SEMI | SOCIEDAD ESPAÑOLA DE MONTAJES INDUSTRIALES | | ES | VKM |
| 16 | SEMK | SPECIA | | | SCAC4 |
| 17 | SEML | SEMINOLE LOGISTICS LLC | | | SCAC4 |
| 18 | SEMN | SECURITY MOVING & STORAGE COMPANY | | | SCAC4 |
| 19 | SEMO | SEABOARD MOVING & STG INC | | | SCAC4 |
| 20 | SEMP | SEMPLE, FRANCES ARTS | | | SCAC4 |
| 21 | SEMR | SAMANIE | | | SCAC4 |
| 22 | SEMT | SETTLEMIRE, M TRUCKING | | | SCAC4 |
| 23 | SEMTA | SouthEastern Michigan Transportation Authority | City: Detroit | USA | TRAFFIC |
| 24 | SEMU | SEACO SRL | | BDS | BIC |
| 25 | SEMV | SE SHIP MANAGEMENT PTE LTD | | | SCAC4 |
| 26 | SEMW | SHELBYVI | | | SCAC4 |
| 27 | SEMX | Seminole Electric Cooperative, Inc. | added 1/1983; 1/1994; 7/2000 (not listed); added 10/2004; 7/2005 | | NAKINA |
| 28 | SEMX | Seminole Electric Cooperative, Inc. | added 1/83; 1/94-7/2000 | | NRHS |
| 29 | SEMX | SEMINOLE ELECTRIC COOPERATIVE INC. | | | PWRC |
| 30 | SEMX | Seminole Electric Cooperative | | | RSRV |
| 31 | SEMX | SEMINOLE ELECTRIC COOPERATIVE INC. | | | SCAC4 |
