| 273 | T | CrwnPtGas | Crown Point Gas Line Department | Utilities |
| 289 | T | WabGasLine | Wabash Gas Line Department | Utilities |
| 297 | T | GaryGasLine | Gary Gas Line Department | Utilities |
| 298 | T | GaryStreet | Gary Street | Utilities |
| 305 | T | GoshenSvc | Goshen Service | Utilities |
| 306 | T | GoshenStreet | Goshen Street | Utilities |
| 313 | T | HmdGasLine | Hammond Gas Line Department | Utilities |
| 314 | T | HmdGasLine | Hammond Gas Line Department | Utilities |
| 321 | T | NIPSCO 321 | Systemwide Unidentified Operations | Utilities |
| 322 | T | LaPorteStreet | Street | Utilities |
| 337 | T | NIPSCO 337 | Systemwide Unidentified Operations | Utilities |
| 353 | T | PlymouthSrvc | Plymouth Service | Utilities |
| 354 | T | PlymouthStreet | Plymouth Street | Utilities |
| 361 | T | NIPSCO 361 | Systemwide Unidentified Operations | Utilities |
| 362 | T | SouthBndStreet | South Bend Street | Utilities |
| 369 | T | ValGasLine | Valparaiso Gas Line Department | Utilities |
| 388 | T | GasEngnrng | Gas Engineering | Utilities |
| 390 | T | NIPSCO Trans | Systemwide Gas Measurement & Transmission | Utilities |
| 529 | T | CrwnPtLines | Crown Point Electric Line Department | Utilities |
| 537 | T | GaryElcLine | Gary Electric Line Department | Utilities |
| 553 | T | HmdElcDst | Hammond Electric Distribution Dispatch | Utilities |
| 561 | T | NIPSCO 561 | Systemwide Unidentified Operations | Utilities |
| 569 | T | HmdElcLine | Systemwide Electric Line Department | Utilities |
| 577 | T | NIPSCO Dst S | Systemwide Electric Distribution Dispatch - South | Utilities |
| 585 | T | RochElcLine | Rochester Electric Line Department | Utilities |
| 593 | T | Vlprso Lines | Valparaiso Electric Line Department | Utilities |
| 613 | T | GoshenSub | Goshen Sub | Utilities |
| 615 | T | PlymouthSub | Plymouth Sub | Utilities |
| 622 | T | NIPSCOChpper | Systemwide Transmission Line Inspections Helicopter | Utilities |
| 625 | T | NIPSCO Dst W | Systemwide Electric Distribution Dispatch - West | Utilities |
| 627 | T | NIPSCO Dst C | Systemwide Electric Distribution Dispatch | Utilities |
| 631 | T | NIPSCO Dsp | Systemwide Electric Dispatch/Generating Stations | Utilities |
| 641 | T | NIPSCOMtrTch | Systemwide Electric Meter Technicians | Utilities |
| 642 | T | HmdMtrShp | Hammond Meter Shop | Utilities |
| 785 | T | HmdOutage | Hammond Outages | Utilities |
| 801 | T | Construction | Construction | Utilities |
| 802 | T | NIPSCOE Line | Systemwide Electric Line Construction | Utilities |
| 803 | T | Structures | Structures | Utilities |
| 804 | T | NIPSCOG Line | Systemwide Gas Line Construction | Utilities |
| 809 | T | Boring | Boring | Utilities |
| 833 | T | NIPSCOStrerm | Systemwide Main Storeroom | Utilities |
| 901 | T | NIPSCORdo N | Systemwide Radio Service Technicians North | Utilities |
| 902 | T | NIPSCORdo S | Systemwide Radio Service Technicians South | Utilities |
| 1021 | T | NIPSCOScrty | Systemwide Security | Utilities |
