| IOIneos Oxide - a Division of Ineos Americas LLC | Plaquemine | LA | Chemical Manufacturing325199 | — | ◐ LIKELY ACTIVE |
| TDThe Dow Chemical CO - Louisiana Operations | Plaquemine | LA | Chemical Manufacturing325110 | — | ◐ LIKELY ACTIVE |
| TSTsrc Specialty Materials LLC - Research & Development Pilot Plant | Plaquemine | LA | Chemical Manufacturing325199 | — | ◐ LIKELY ACTIVE |
| WCWestlake Chemicals & Vinyls LLC - Plaquemine Facility | Plaquemine | LA | Chemical Manufacturing325110 | — | ◐ LIKELY ACTIVE |
| ALAir Liquide Large Industries - Plaquemine ASU | Plaquemine | LA | Chemical Manufacturing325120 | 20-99 | ◐ LIKELY ACTIVE |
| WCWestlake Chemicals and Vinyls, LLC | Plaquemine | LA | Chemical Manufacturing325180 | 100-499 | ◐ LIKELY ACTIVE |
| BCBlue Cube - Plaquemine Operations | Plaquemine | LA | Chemical Manufacturing325180 | 100-499 | ◐ LIKELY ACTIVE |
| DPDiamond Plastics Corporation Plaquemine | Plaquemine | LA | Plastics and Rubber Products Manufacturing326122 | 20-99 | ◐ LIKELY ACTIVE |
| DIDow, Inc. Plaquemine Operations | Plaquemine | LA | Chemical Manufacturing325199 | 500+ | ◐ LIKELY ACTIVE |
| IOIneos Oxide | Plaquemine | LA | Chemical Manufacturing325199 | 20-99 | ◐ LIKELY ACTIVE |
| PMPlaquemine Methocel | Plaquemine | LA | Chemical Manufacturing325199 | 20-99 | ◐ LIKELY ACTIVE |
| STSE Tylose Louisiana, LLC | Plaquemine | LA | Chemical Manufacturing325199 | 20-99 | ◐ LIKELY ACTIVE |
| TSTSRC Specialty Materials, LLC | Plaquemine | LA | Chemical Manufacturing325212 | 20-99 | ◐ LIKELY ACTIVE |