| 1 | HMC | Heliamerica de Mexico, S.A. de C.V. | Callsign: Heliamerica, | MEX | AVCODES |
| 2 | HMC | Heliamerica De Mexico | | | ICAO1 |
| 3 | HMCA | HOFFER, PETER CONTEMPORARY ART INC | | | SCAC4 |
| 4 | HMCD | HERMAN FARM | | | SCAC4 |
| 5 | HMCE | HIS MAJESTY COACHES INC | | | SCAC4 |
| 6 | HMCG | H M C TRANSPORTATION INC | | | SCAC4 |
| 7 | HMCH | HEARTLAND MOTOR COACH INC | | | SCAC4 |
| 8 | HMCI | HEWES MARINE CO INC | | | SCAC4 |
| 9 | HMCJ | HAGIE MANUFACTURING CO INC | | | SCAC4 |
| 10 | HMCO | HAIRE MACHINE CORPORATION | | | SCAC4 |
| 11 | HMCP | HENKE MANUFACTURING CORPORATION | | | SCAC4 |
| 12 | HMCQ | H & M CONTAINER TRANSPORT INC | | | SCAC4 |
| 13 | HMCR | The Huntsville and Madison County R.R. Authority | added 7/1985; 1/1994; eliminated 4/1997; 7/2000-7/2005 | | NAKINA |
| 14 | HMCR | The Huntsville and Madison County R.R. Authority | 1/94; eliminated 4/97; 7/2000 | | NRHS |
| 15 | HMCR | HUNTSVILLE & MADISON COUNTY RR AUTHORITY | | | PWRC |
| 16 | HMCR | Huntsville and Madison County Railroad | | | RSRV |
| 17 | HMCT | HAMILL CREEK TIMBERWRIGHTS INC | | | SCAC4 |
| 18 | HMCU | EVERGREEN MARINE (UK) LIMITED | | GB | BIC |
| 19 | HMCU | HATSU MARINE LTD | | | SCAC4 |
| 20 | HMCX | SC Rail Leasing America, Inc. d/b/a Southern Illinois Railcar Co. | added 1/2008 | | NAKINA |
| 21 | HMCX | Southern Illinois Railcar Co. | added 4/2004; 7/2005; eliminated 1/2008 | | NAKINA |
| 22 | HMCX | HoltraChem Manufacturing Co., L.L.C. | added 7/1995; eliminated 7/1997; 7/2000 (not listed) | | NAKINA |
| 23 | HMCX | HoltraChem Manufacturing Co., L.L.C. | added 7/95; eliminated 7/97; 7/2000 | | NRHS |
| 24 | HMCX | *HOLTRACHEM MANUFACTURING CO., LLC | | | PWRC |
| 25 | HMCX | +SC RAIL LEASING AMERICA d/b/a SOUTHERN ILLINOIS RAILCAR CO. | | | PWRC |
| 26 | HMCX | HoltraChem Manufacturing | | | RSRV |
| 27 | HMCX | VTG RAIL INC | | | SCAC4 |
| 28 | HMCY | HOFFMANN MACHINE COMPANY INC | | | SCAC4 |
