| DADecatur Autobody | Decatur | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| DCDecatur Construction Services INC | Decatur | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| DPDecatur Plating & Mfg CO | Decatur | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| DTDedicated Trailer Cleaning INC | Channahon | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| DMDehler Manufacturing CO INC | Chicago | IL | Furniture and Related Product Manufacturing337124 | — | ◇ UNVERIFIED |
| DED E H Printed Circuits | Elgin | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| DMDel Monte CORP | Mendota | IL | Food Manufacturing311421 | — | ◇ UNVERIFIED |
| DPDelta Precision Circuits | Elk Grove Village | IL | Fabricated Metal Product Manufacturing332722 | — | ◇ UNVERIFIED |
| DTDelta Technologies | Chicago | IL | Electrical Equipment, Appliance & Component Manufacturing335313 | — | ◇ UNVERIFIED |
| DMDeluxe Manufacturing Operations INC | Des Plaines | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| DADennhardt a W CO | East Moline | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| DJDepue/new Jersey Zinc/mobil Chemical CORP. | Depue | IL | Chemical Manufacturing325312 | — | ◇ UNVERIFIED |
| DIDesoto INC - Chemical Products Div | Joliet | IL | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| DPDes Plaines Printing LLC | Buffalo Grove | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| DCDetrex CORP Solvent & Env Svc | Melrose Park | IL | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| DCDeveco CORP | Belvidere | IL | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| DMDfg Mercury CORP | Evanston | IL | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| DMDg Manufacturing INC | Mt Zion | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| DNDiageo North America INC | Plainfield | IL | Beverage and Tobacco Product Manufacturing312140 | — | ◇ UNVERIFIED |
| DCDiameters CORP | Franklin Park | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| DBDiamond Biofuels INC | Mazon | IL | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| DCDiamond Construction CO | Mt Sterling | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| DPDiamond Plating CO INC | Madison | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| DCDicicco Concrete Products CO | Chicago Heights | IL | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| DCDickey-john CORP | Auburn | IL | Computer and Electronic Product Manufacturing334519 | — | ◇ UNVERIFIED |
| DPDiemand Printing CO INC | Chicago | IL | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| DPDiemand Printing CO INC | Chicago | IL | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| DRDigital Realty Trust LP | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| DIDike-o-seal INC | Chicago | IL | Machinery Manufacturing333248 | — | ◇ UNVERIFIED |
| DTDiller Tile Company INC. | Chatsworth | IL | Plastics and Rubber Products Manufacturing326122 | — | ◇ UNVERIFIED |
| DPDi Paolo CO | River Grove | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| DVDipper Ventures LLC Ch3 Data Center | Elk Grove Village | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| DSDip Seal Plastics INC | Rockford | IL | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| DIDisa Industries INC | Oswego | IL | Fabricated Metal Product Manufacturing332997 | — | ◇ UNVERIFIED |
| DDDis Direct LLC | Itasca | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| DLDiversapack LLC | Marengo | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| DCDiversified Composites CORP | Rock Falls | IL | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| DKD & K International INC | Elk Grove Village | IL | Plastics and Rubber Products Manufacturing326113 | — | ◇ UNVERIFIED |
| DMD Martin Enterprises INC | Chicago Heights | IL | Fabricated Metal Product Manufacturing332618 | — | ◇ UNVERIFIED |
| DMDme Manufacturing | Skokie | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| DMD. Miles | Urbana | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| DCDober Chemical CORP | Midlothian | IL | Chemical Manufacturing325130 | — | ◇ UNVERIFIED |
| DEDolton Extrusion CO INC | Dolton | IL | Primary Metal Manufacturing331316 | — | ◇ UNVERIFIED |
| DADon Anderson | Hoffman | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| DDor-o-matic | Harwood Heights | IL | Electrical Equipment, Appliance & Component Manufacturing335999 | — | ◇ UNVERIFIED |
| DIDoumak INC | Elk Grove Village | IL | Food Manufacturing311340 | — | ◇ UNVERIFIED |
| DIDover Industrial Chrome INC | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| DADow Automotive | Kankakee | IL | Chemical Manufacturing325520 | — | ◇ UNVERIFIED |
| DSDoyle Signs INC. | Addison | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| DWDoyle Williams Salvage | Mc Leansboro | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
