| SPSwitzer Products LLC | Richmond | IL | Chemical Manufacturing325991 | — | ◇ UNVERIFIED |
| TITakasago International CORP (usa) | University Park | IL | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| TCTapecoat CO INC | Evanston | IL | Chemical Manufacturing325520 | — | ◇ UNVERIFIED |
| TSTec Specialty Products, LLC | Aurora | IL | Chemical Manufacturing325520 | — | ◇ UNVERIFIED |
| TCTennant Coatings INC | Chicago | IL | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| TDThe Dow Chemical CO | Joliet | IL | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| TCTioga Coatings CORP | Rockford | IL | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| TUTomoegawa USA INC | Wheeling | IL | Chemical Manufacturing325130 | — | ◇ UNVERIFIED |
| TIToyo Ink America, LLC | Wood Dale | IL | Chemical Manufacturing325910 | — | ◇ UNVERIFIED |
| TCTri County Fs, Inc.- Carrollton | Carrollton | IL | Chemical Manufacturing325314 | — | ◇ UNVERIFIED |
| TVTrue Value Manufacturing CO | Chicago | IL | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| TETyler Enterprises INC | Elwood | IL | Chemical Manufacturing325314 | — | ◇ UNVERIFIED |
| UHUnilever Home & Personal Care USA | Rolling Meadows | IL | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| UBUnited Bulk Powders and Chemical Packaging Plant | East Saint Louis | IL | Chemical Manufacturing325130 | — | ◇ UNVERIFIED |
| UGUnited Gilsonite Laboratories | Jacksonville | IL | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| UFUniversal Form Clamp | Bellwood | IL | Chemical Manufacturing325130 | — | ◇ UNVERIFIED |
| UBUS Bio Marshall LLC | Marshall | IL | Chemical Manufacturing325193 | — | ◇ UNVERIFIED |
| UIUS Ink a Division of Sun Chemical CORP | Mccook | IL | Chemical Manufacturing325910 | — | ◇ UNVERIFIED |
| USUtica Silicates Plt | Utica | IL | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| USUv Specialties LLC | Saint Charles | IL | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| VBValent Biosciences | Libertyville | IL | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
Valent Biosciences CORP | Long Grove | IL | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| VPVee Pak INC | Countryside | IL | Chemical Manufacturing325620 | — | ◇ UNVERIFIED |
| VCVelsicol Chemical CORP. (marshall Plant) | Marshall | IL | Chemical Manufacturing325188 | — | ◇ UNVERIFIED |
| VIVersatile Inks | Addison | IL | Chemical Manufacturing325910 | — | ◇ UNVERIFIED |
| VPVisual Pak C/o Clorox | Waukegan | IL | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| VDVj Dolan & CO INC | Chicago | IL | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| VIVysis INC | Downers Grove | IL | Chemical Manufacturing325413 | — | ◇ UNVERIFIED |
| WEWaltonville Ethanol LLC | Waltonville | IL | Chemical Manufacturing325193 | — | ◇ UNVERIFIED |
| WMWeber-valentine Michigan | Elk Grove Village | IL | Chemical Manufacturing325992 | — | ◇ UNVERIFIED |
| WPWilliams-hayward Protective Coatings INC | Summit | IL | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| XIXena International INC | Polo | IL | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| ZIZarco Industries INC | Chicago | IL | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| 1A1st Ayd Building | Elgin | IL | Chemical Manufacturing325611 | 100-499 | ◐ LIKELY ACTIVE |
| 6H600 Helget Gas - Chicago | Bensenville | IL | Chemical Manufacturing325120 | 20-99 | ◐ LIKELY ACTIVE |
| APAbbVie (Abbott Park ) | North Chicago | IL | Chemical Manufacturing325412 | 500+ | ◐ LIKELY ACTIVE |
| ACAbbVie (North Chicago) | North Chicago | IL | Chemical Manufacturing325412 | 500+ | ◐ LIKELY ACTIVE |
| AAddison | Addison | IL | Paper Manufacturing322230 | 20-99 | ◐ LIKELY ACTIVE |
| ASAdhesive Solutions - Industrial Assembly : Ringwood | Ringwood | IL | Chemical Manufacturing325520 | 20-99 | ◐ LIKELY ACTIVE |
| APAir Products and Chemicals Inc.- Granite City Terminal | Granite City | IL | Chemical Manufacturing325120 | 20-99 | ◐ LIKELY ACTIVE |
| APAir Products and Chemicals Inc. LaSalle Facility | Lasalle | IL | Chemical Manufacturing325120 | 20-99 | ◐ LIKELY ACTIVE |
| AIAllergan, INC. | North Chicago | IL | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| ASAllnex (East St. Louis) | East Saint Louis | IL | Chemical Manufacturing325211 | 20-99 | ◐ LIKELY ACTIVE |
| ACAmerican Chemical and Equipment, INC. | Northlake | IL | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| AAmericoats | Franklin Park | IL | Chemical Manufacturing325510 | 20-99 | ◐ LIKELY ACTIVE |
| AGAPS Grupa, LLC | Chicago | IL | Chemical Manufacturing325411 | 100-499 | ◐ LIKELY ACTIVE |
| AIArkema INC | Alsip | IL | Chemical Manufacturing325211 | 20-99 | ◐ LIKELY ACTIVE |
| APAstellas Pharma Global Development | Northbrook | IL | Chemical Manufacturing325412 | 500+ | ◐ LIKELY ACTIVE |
| AAAtlas & Associates, INC | Country Club Hills | IL | Chemical Manufacturing325998 | — | ◐ LIKELY ACTIVE |
| APAtlas Putty 8351 | Tinley Park | IL | Chemical Manufacturing325510 | 100-499 | ◐ LIKELY ACTIVE |