| BHBaxter Healthcare CORP | Marion | NC | Chemical Manufacturing325412 | 500+ | ● ACTIVE |
| CICentral Indiana Ethanol, LLC | Marion | IN | Chemical Manufacturing325120 | 100-499 | ● ACTIVE |
| NENugen Energy LLC | Marion | SD | Chemical Manufacturing325110 | 20-99 | ● ACTIVE |
| PBPoet Biorefining - Marion | Marion | OH | Chemical Manufacturing325193 | 20-99 | ● ACTIVE |
| SCSika CORP Marion Operations | Marion | OH | Chemical Manufacturing325520 | 100-499 | ● ACTIVE |
Marvel Labs INC | Marion | IN | Chemical Manufacturing325520 | — | ● ACTIVE |
| DCDiagaph/itw CO | Marion | IL | Chemical Manufacturing325910 | — | ◐ LIKELY ACTIVE |
| GDGeneral Dynamics Ots Test Rang | Marion | IL | Chemical Manufacturing325920 | — | ◐ LIKELY ACTIVE |
| SISuperflo INC | Marion | VA | Chemical Manufacturing325998 | — | ◐ LIKELY ACTIVE |
| GDGeneral Dynamics Ots Area 13 | Marion | IL | Chemical Manufacturing325920 | — | ◐ LIKELY ACTIVE |
| GCGrow Choice Ag INC Dba Brickers Choice Fertilizer | Marion | PA | Chemical Manufacturing325314 | — | ◐ LIKELY ACTIVE |
| APAir Products and Chemicals, INC. | Marion | IN | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| NANachurs Alpine Solutions - Marion Plant | Marion | OH | Chemical Manufacturing325314 | — | ◇ UNVERIFIED |
| OMOzark Materials, LLC | Marion | IN | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
Indiana Oxygen Company-Marion | Marion | IN | Chemical Manufacturing325120 | 20-99 | ◐ LIKELY ACTIVE |
| KGKey Gas Components Inc | Marion | NC | Chemical Manufacturing325120 | 20-99 | ◐ LIKELY ACTIVE |
| RMReElement Marion Facility | Marion | IN | Chemical Manufacturing325180 | 1-19 | ◐ LIKELY ACTIVE |
| ELEco Lips, Inc. | Marion | IA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| NWNalco Water Marion Facility | Marion | VA | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| PAPorter-cnf America INC | Marion | IL | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |