| AIArkema Inc/west Chester | West Chester | PA | Chemical Manufacturing325199 | 20-99 | ● ACTIVE |
| JMJohnson Matthey INC. | West Chester | PA | Chemical Manufacturing325998 | 100-499 | ● ACTIVE |
Midwest Sea Salt Company, INC | West Chester | OH | Chemical Manufacturing325620 | — | ● ACTIVE |
| MTMolecular Targeting Technologies, INC. | West Chester | PA | Chemical Manufacturing325413 | — | ● ACTIVE |
Quality System Services LLC | West Chester | OH | Chemical Manufacturing325413 | — | ● ACTIVE |
Verrica Pharmaceuticals INC. | West Chester | PA | Chemical Manufacturing325412 | — | ● ACTIVE |
| APAstrazeneca Pharmaceutical LP | West Chester | OH | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| TBThree Bond International INC | West Chester | OH | Chemical Manufacturing325520 | 20-99 | ◐ LIKELY ACTIVE |
| OEOctal Extrusions Corporation | West Chester | OH | Chemical Manufacturing325211 | 20-99 | ◐ LIKELY ACTIVE |
| FGFlint Group Packaging Inks North America Corporation | West Chester | OH | Chemical Manufacturing325910 | — | ◇ UNVERIFIED |
| KFKidde Fire Fighting INC | West Chester | PA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| WIWinelco INC | West Chester | OH | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| WPWyeth Pharmaceuticals/west Chester | West Chester | PA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| AAPTech | West Chester | OH | Chemical Manufacturing325199 | 20-99 | ◐ LIKELY ACTIVE |
| CSChem Service Inc | West Chester | PA | Chemical Manufacturing325199 | 1-19 | ◐ LIKELY ACTIVE |
| FGFlint Group West Chester | West Chester | OH | Chemical Manufacturing325910 | 20-99 | ◐ LIKELY ACTIVE |
| NRNational Resilience, INC | West Chester | OH | Chemical Manufacturing325412 | 500+ | ◐ LIKELY ACTIVE |
| Ppharmablock | West Chester | PA | Chemical Manufacturing325412 | 20-99 | ◐ LIKELY ACTIVE |
| RIRusmar Inc (adba Atmos Technologies) | West Chester | PA | Chemical Manufacturing325998 | 20-99 | ◐ LIKELY ACTIVE |
| WCWest Chester Branch 28 | West Chester | PA | Chemical Manufacturing325120 | 1-19 | ◐ LIKELY ACTIVE |
| OEOctal Extrusion Corporation | West Chester | OH | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |