| 1 | TAG | TAG Aviation USA, Inc. | Callsign: TAG U-S, | USA | AVCODES |
| 2 | TAG | Orion Air, Inc. | Callsign: Tagge, | USA | AVCODES |
| 3 | TAG | TAG Aviation San Marino S.r.l. | Callsign: Tagspirit, | RSM | AVCODES |
| 4 | TAG | TAG Aviation USA | | | ICAO1 |
| 5 | TAG | Tennessee, Alabama & Georgia Ry. Co. | 1/1975-1/1980 | | NAKINA |
| 6 | TAG | Southern Ry. System | eliminated 1/1983; eliminated 1/1991 | | NAKINA |
| 7 | TAG | Norfolk Southern Ry. Co. | added 1/1991; 1/1994-7/2000 | | NAKINA |
| 8 | TAG | Norfolk Southern Ry. Co. (Norfolk Southern) | 7/2005 | | NAKINA |
| 9 | TAG | Tennessee, Alabama & Georgia Ry. Co. | 1/75-1/80 | | NRHS |
| 10 | TAG | Southern Ry. System | eliminated 1/83; eliminated 1/91 | | NRHS |
| 11 | TAG | Norfolk Southern Ry. Co. | added 1/91; 1/94-7/2000 | | NRHS |
| 12 | TAG | NORFOLK SOUTHERN [SOUTHERN; TENNESSEE, ALABAMA & GEORGIA RWY. CO.] | | | PWRC |
| 13 | TAG | Tennessee, Alabama and Georgia Railway (Norfolk Southern Railway) | | | RSRV |
| 14 | TAG | Tennessee, Alabama & Georgia Ry. Co. | | USA | TRAFFIC |
| 15 | TAGA | TAGGART AMERICAN, INC | | | SCAC3 |
| 16 | TAGA | TRANSPORTES AGL S A DE C V | | | SCAC4 |
| 17 | Tågab | Tågåkeriet i Bergslagen AB | 1994 - | S | svenska-lok.se |
| 18 | TAGAB | Tagakeriet i Bergs;agen AB | | S | TRAFFIC |
| 19 | TAGAB | Tågåkeriet i Bergslagen AB | | SE | VKM |
| 20 | TAGB | TRANSPORT GUY BOURASSA INC | | | SCAC3 |
| 21 | TAGB | TRANSPORT GUY BOURASSA INC | | | SCAC4 |
| 22 | TAGC | TAG INC | | | SCAC3 |
| 23 | TAGE | TAG CO INC | | | SCAC4 |
| 24 | TAGF | TRANS GULF INC | | | SCAC3 |
| 25 | TAGG | TAGGART TRANSPORT CO, LIMITED | | | SCAC3 |
| 26 | TAGG | TRANSPORTES AGAR | | | SCAC4 |
| 27 | TAGH | THUNDER AND LIGHTNING INC | | | SCAC4 |
| 28 | TAGI | TAGIT MOVING & STORAGE | | | SCAC3 |
| 29 | TAGJ | TREJO, AGUILINO | | | SCAC4 |
| 30 | TAGK | TAG-A-LONG TRUCKING | | | SCAC3 |
| 31 | TAGK | TRANSPORT ANDRE GIROUX INC | | | SCAC4 |
| 32 | TAGL | TRANSPORTES AGUILA DE CD JUAREZ S A | | | SCAC4 |
| 33 | TAGM | TAG TEAM TRANSPORT LTD | | | SCAC3 |
| 34 | TAGO | TRANSPORT ANDRE GIROUX INC | | | SCAC3 |
| 35 | TAGP | TAGER SHIPPING CO. INC | | | SCAC3 |
| 36 | TAGQ | TAG TRANSPORT INC | | | SCAC4 |
| 37 | TAGR | TAGUS RANCH TRUCKING INC | | | SCAC3 |
| 38 | TAGR | TRANSPORTES AGUILA REAL | | | SCAC4 |
| 39 | TAGS | TAYLOR GRAIN SALES, INC | | | SCAC3 |
| 40 | TAGS | TAG Sinnich | Real: TAG | I | TRAFFIC |
| 41 | TAGV | TAGSHIP, INC. | | | SCAC3 |
| 42 | TAGW | T A G TRUCKING | | | SCAC3 |
| 43 | TAGX | Texoma AG Products Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 44 | TAGX | Texoma AG Products Inc. | Jul-00 | | NRHS |
| 45 | TAGX | *TEXOMA AG PRODUCTS, INC. | | | PWRC |
| 46 | TAGX | +HELENA CHEMICAL CO. | | | PWRC |
| 47 | TAGX | Texoma AG Products | | | RSRV |
| 48 | TAGX | HELENA CHEMICAL COMPANY | | | SCAC4 |
| 49 | TAGY | TRANS-AMERICAN STEAMSHIP AGENCY INC | | | SCAC3 |
