| APAccurage Paving & Seal Coating | Dixon | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| ALAccurate Logistics INC | Markham | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| APAccurate Partitions CORP | Mccook | IL | Fabricated Metal Product Manufacturing332323 | — | ◇ UNVERIFIED |
 Ace Metal Crafts CO | Franklin Park | IL | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| APAce Plating CO | Chicago | IL | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| ARAce Reprographics | Downers Grove | IL | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| ATAce Tire & Wheel | Bridgeview | IL | Machinery Manufacturing333924 | — | ◇ UNVERIFIED |
| AFAch Foamtechnologies LLC | Waukegan | IL | Plastics and Rubber Products Manufacturing326140 | — | ◇ UNVERIFIED |
| AFAch Food Companies INC | Champaign | IL | Food Manufacturing311222 | — | ◇ UNVERIFIED |
| ASAcme Screw Company | Wheaton | IL | Fabricated Metal Product Manufacturing332722 | — | ◇ UNVERIFIED |
| AEAcra Electric CORP | Schiller Park | IL | Machinery Manufacturing333994 | — | ◇ UNVERIFIED |
| AUActaris US Gas INC | Neponset | IL | Computer and Electronic Product Manufacturing334514 | — | ◇ UNVERIFIED |
| AIActavis INC | Gurnee | IL | Chemical Manufacturing325413 | — | ◇ UNVERIFIED |
| AAAction Athletic Equipment INC | Zion | IL | Miscellaneous Manufacturing339920 | — | ◇ UNVERIFIED |
| ADAction Disposal | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| ARAction Rack & Mfg CO | Chicago | IL | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| ABActive Biomaterials LLC | Elk Grove Village | IL | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| AEActown Electrocoil INC | Spring Grove | IL | Computer and Electronic Product Manufacturing334416 | — | ◇ UNVERIFIED |
| ABAcuity Brands Lighting | Hanover Park | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| ADAdc Diecasting LLC | Elkgrove Village | IL | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| ALAdc LP | Wheeling | IL | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| ACAdheron Coatings CORP | Oak Forest | IL | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| ABAdhesive Binding CORP | Downers Grove | IL | Printing and Related Support Activities323120 | — | ◇ UNVERIFIED |
| ASAdhesive Systems INC | Frankfort | IL | Chemical Manufacturing325520 | — | ◇ UNVERIFIED |
| ACAdjustable Clamp CO | Chicago | IL | Fabricated Metal Product Manufacturing332510 | — | ◇ UNVERIFIED |
| AAAdm Alliance Nutrition INC | Quincy | IL | Food Manufacturing311119 | — | ◇ UNVERIFIED |
| AAAdm Alliance Nutrition INC | Quincy | IL | Food Manufacturing311119 | — | ◇ UNVERIFIED |
| AAAdm Animal Nutrition | Lincoln | IL | Food Manufacturing311119 | — | ◇ UNVERIFIED |
| ADAdm Development Products | Decatur | IL | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| AMAdm Milling CO | Chicago | IL | Food Manufacturing311211 | — | ◇ UNVERIFIED |
| ARAdm Rail Car Repair Facility | Decatur | IL | Transportation Equipment Manufacturing336510 | — | ◇ UNVERIFIED |
| AWAdm West Complex-stratas Foods | Decatur | IL | Food Manufacturing311222 | — | ◇ UNVERIFIED |
| AAAdvance Asphalt CO | Hillsdale | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| AAAdvanced Asphalt CO | Hennepin | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| AAAdvanced Asphalt CO | Walnut | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| AAAdvanced Asphalt CO | Peoria | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| AAAdvanced Asphalt CO | Peru | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| AAAdvanced Asphalt INC | Rock Falls | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| ADAdvanced Diamond Technologies | Romeoville | IL | Miscellaneous Manufacturing339991 | — | ◇ UNVERIFIED |
 Advanced Drainage Systems | Mendota | IL | Fabricated Metal Product Manufacturing332996 | — | ◇ UNVERIFIED |
| AGAdvanced Galvanics INC | Bensenville | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| AMAdvanced Material Svcs | Aurora | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
 Advanced Packaging | Waukegan | IL | Machinery Manufacturing333993 | — | ◇ UNVERIFIED |
| AAAdvantage Autobody | Hampton | IL | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| AAAdvantage Automation Midwest INC | Decatur | IL | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| APAdvantage Printing INC | Addison | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| ATAdvantage Tree Service and Lawncare | Charleston | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| ATAdvent Tool & Mfg INC | Antioch | IL | Machinery Manufacturing333517 | 1-19 | ◇ UNVERIFIED |
| AKAens Kankakee Plt | Kankakee | IL | Chemical Manufacturing325193 | — | ◇ UNVERIFIED |
| APAero Plating Works | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
