| JAJupiter Aluminum CORP | Hammond | 100–499 | ● ACTIVE |
 Midwest Aerospace Casting, LLC | Merrillville | — | ● ACTIVE |
| ARArmsted Rail Company INC | Hammond | — | ◐ LIKELY ACTIVE |
| HMHarsco Minerals Briquetting LLC | East Chicago | — | ◐ LIKELY ACTIVE |
| ECElectric Coating Technologies, LLC | East Chicago | — | ◇ UNVERIFIED |
| TCTube City INC at US Steel | Gary | — | ◇ UNVERIFIED |
| AMArcelor Mittal/indiana Harbor Long Carbon | East Chicago | — | ◐ LIKELY ACTIVE |
| APArcelormittal Plate LLC (gary Plate) | Gary | — | ◐ LIKELY ACTIVE |
| IMInternational Mill Service, INC. | East Chicago | — | ◐ LIKELY ACTIVE |
| MCMid-continent Coal & Coke Company Contractor of US Steel Cor | Gary | — | ◐ LIKELY ACTIVE |
| TTT-b Tube Company Incorporated | Gary | 20–99 | ◐ LIKELY ACTIVE |
| USUS Steel East Chicago | East Chicago | — | ◐ LIKELY ACTIVE |
| ATAllied Tube and Conduit | Merrillville | — | ◐ LIKELY ACTIVE |
| BIBrandenburg Industrial Service CO | Gary | — | ◐ LIKELY ACTIVE |
| NMNational Material Processing | East Chicago | — | ◐ LIKELY ACTIVE |
| ASAleris Specialty Products, INC. | Hammond | — | ◇ UNVERIFIED |
| ARAmg Resources CORP | Gary | — | ◇ UNVERIFIED |
| BSBeemsterboer Slag Corporation Contractor of Cleveland-cliffs Steel LLC | East Chicago | — | ◇ UNVERIFIED |
| BIBlastech, INC. | Gary | — | ◇ UNVERIFIED |
| FMFederated Metals CORP | Whiting | — | ◇ UNVERIFIED |
| FEFritz Enterprises Incorporated | Gary | — | ◇ UNVERIFIED |
| MIMetals Investment Trust LTD. | East Chicago | — | ◇ UNVERIFIED |
| RERepublic Engineered Products, LLC - Gary Dunes Plant | Gary | — | ◇ UNVERIFIED |
| RJR J R Drying, INC. | East Chicago | — | ◇ UNVERIFIED |
| TCTag Contructors | Hammond | — | ◇ UNVERIFIED |
| ATAllied Tube & Conduit Hobart Indiana | Merrillville | 100–499 | ◐ LIKELY ACTIVE |
| AUArcelormittal USA Research LLC | East Chicago | — | ◐ LIKELY ACTIVE |
| CCCleveland-Cliffs - Corporate Office East Chicago - Corporate | East Chicago | 100–499 | ◐ LIKELY ACTIVE |
| CICleveland-Cliffs - Indiana Harbor | East Chicago | 500+ | ◐ LIKELY ACTIVE |
| GWGary Works | Gary | 500+ | ◐ LIKELY ACTIVE |
| PGPhoenix Global, LLC-Indiana Harbor East | East Chicago | 20–99 | ◐ LIKELY ACTIVE |
| PGPhoenix Global, LLC-Indiana Harbor West | East Chicago | 20–99 | ◐ LIKELY ACTIVE |
| AIAkj Industries INC Contractor of Uss Ga | Gary | — | ◇ UNVERIFIED |
| AIArcelormittal Ihlc | East Chicago | — | ◇ UNVERIFIED |
| AIArcelormittal Indiana Harbor | East Chicago | — | ◇ UNVERIFIED |
| AIArcelormittal Indiana Harbor - Safety Dept | East Chicago | — | ◇ UNVERIFIED |
| BBeemsterboer-micropellet | East Chicago | — | ◇ UNVERIFIED |
 Chicago Magnesium Casting Company | Crown Point | — | ◇ UNVERIFIED |
| NLNiagara Lasalle Corporation | Hammond | — | ◇ UNVERIFIED |
| PSPhoenix Services LLC Pig Iron Caster | Gary | — | ◇ UNVERIFIED |
| UCUss Central Teaming Company INC | Gary | — | ◇ UNVERIFIED |
| USUS Steel Gary Complex | Gary | — | ◇ UNVERIFIED |
| WMWhiting Metals, LLC | Whiting | — | ◇ UNVERIFIED |
