| 1 | HOS | Hoosier Southern R.R. | 7/2000-7/2005; added 7/2008 | | NAKINA |
| 2 | HOS | Hoosier Southern R.R. | Jul-00 | | NRHS |
| 3 | HOS | HOOSIER SOUTHERN RAILROAD | | | PWRC |
| 4 | HOS | Hoosier Southern Railroad | | | RSRV |
| 5 | HOS | HOOSIER SOUTHERN RAILROAD | | | SCAC4 |
| 6 | HOS | Hoosier Southern Railroad | | USA | TRAFFIC |
| 7 | HOSC | Hoosier Connection, The Indiana Eastern R.R. and Transportation, Inc. | eliminated 7/1981; eliminated 1/1985 | | NAKINA |
| 8 | HOSC | The Hoosier Connection | 1/1980 | | NAKINA |
| 9 | HOSC | Hoosier Connection, The Indiana Eastern R.R. and Transportation, Inc. | added 7/1979 | | NAKINA |
| 10 | HOSC | Hoosier Connection, The Indiana Eastern R.R. and Transportation, Inc. | added 7/79 | | NRHS |
| 11 | HOSC | The Hoosier Connection | Jan-80 | | NRHS |
| 12 | HOSC | Hoosier Connection, The Indiana Eastern R.R. and Transportation, Inc. | eliminated 7/81; eliminated 1/85 | | NRHS |
| 13 | HOSC | NORFOLK SOUTHERN [CONRAIL; PENN CENTRAL; PENNSYLVANIA RR; INDIANA & EASTERN RR] | | | PWRC |
| 14 | HOSC | Indiana and Eastern Railroad: The Hoosier Connection (Norfolk Southern) | | | RSRV |
| 15 | HOSD | HOLLAND SPECIAL DELIVERY | | | SCAC4 |
| 16 | HOSI | HILLIS OUTDOOR SPECIALIST INC | | | SCAC4 |
| 17 | HOSK | HOSKINS, VIC TRUCKING | | | SCAC4 |
| 18 | HOSM | HARBOR OFFSHORE MARINE INC | | | SCAC4 |
| 19 | HOSN | HARRISON OILFIELD SERVICES INC | | | SCAC4 |
| 20 | HOSO | HOUSTON CHEMICAL CO | | | SCAC4 |
| 21 | HOSP | HEBEI OCEAN SHIPPING CO LTD | | | SCAC4 |
| 22 | HOSV | HOLTHAUS TRUCK SERVICE INC | | | SCAC4 |
