| BCBerkeley Contract Packaging | Edwardsville, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| BBBernadette Business Forms Inc-hazelwood | Hazelwood, MO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| BBBest Block - Bridgeton/st. Louis Mo Plant | Bridgeton, MO | Nonmetallic Mineral Product Manufacturing327331 | — | ◇ UNVERIFIED |
| BEBleeding Edge Engineered Systems | Sullivan, MO | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| BCBmk Corporation | Earth City, MO | Chemical Manufacturing325991 | — | ◇ UNVERIFIED |
| BCBoa Construction | Saint Louis, MO | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| BABodine Aluminum, INC | Saint Louis County, MO | Primary Metal Manufacturing331528 | — | ◇ UNVERIFIED |
| BABodine Aluminum Inc-walton Road | Saint Louis, MO | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| BTBodycote Thermal Processing | Saint Louis, MO | Fabricated Metal Product Manufacturing332811 | — | ◇ UNVERIFIED |
| BCBoeing CO | Mascoutah, IL | Transportation Equipment Manufacturing336411 | — | ◇ UNVERIFIED |
| BDBohn & Dawson | Kirkwood, MO | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| BPBorden Pasta - Shaw Facility | Saint Louis, MO | Food Manufacturing311823 | — | ◇ UNVERIFIED |
| BMBrady Mccasland INC | East Saint Louis, IL | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| BTBraking Technologies Inc-braking Technologies INC | O Fallon, MO | Transportation Equipment Manufacturing336211 | — | ◇ UNVERIFIED |
| BMBreckenridge Material Co-st Louis (plant 6) | Saint Louis, MO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| BMBreckenridge Materials (mcclay) | Festus, MO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| BOBreckenridge of Il | Lebanon, IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| BOBreckenridge of Il | Caseyville, IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| BOBreckenridge of Il | Belleville, IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| BOBreckenridge of Illinois LLC | Hamel, IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| BMBrenntag Mid South INC | East Saint Louis, IL | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| BIBresnaham's INC | Saint Louis, MO | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
| BBridgestone/firestone-hazelwood | Hazelwood, MO | Plastics and Rubber Products Manufacturing326212 | — | ◇ UNVERIFIED |
| BEBromley Excavating | Centralia, IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| BWBrook & Whittle LLC | Saint Louis, MO | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| BPBrowns Processing | Elsberry, MO | Food Manufacturing311611 | — | ◇ UNVERIFIED |
| BMBuilder's Marble and Granite INC. | Fenton, MO | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| BPBuilding Products CORP | Belleville, IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CICamie-campbell Inc-watson Industrial Park | Saint Louis, MO | Chemical Manufacturing325520 | — | ◇ UNVERIFIED |
| CPCaraustar Packaging-baur Blvd | Saint Louis, MO | Paper Manufacturing322211 | — | ◇ UNVERIFIED |
| CLCare-tech Laboratories/consolidated Chemical, INC. | Saint Louis, MO | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| CSCashs Scrap Metal & Iron | Saint Louis, MO | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| CICdex Inc-cdex INC | Pacific, MO | Fabricated Metal Product Manufacturing332721 | — | ◇ UNVERIFIED |
| CCCelta Chemical | Granite City, IL | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| CCCentaur Concrete Co-chesterfield | Chesterfield, MO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CICenturion Investments Inc-avmats | Mascoutah, IL | Transportation Equipment Manufacturing336411 | — | ◇ UNVERIFIED |
| CBCentury Brass Works INC | Swansea, IL | Primary Metal Manufacturing331522 | — | ◇ UNVERIFIED |
| CSCenveo St. Louis-reco | Crestwood, MO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| COCert Operations Rcb, LLC Labadie | Labadie, MO | Petroleum and Coal Products Manufacturing324199 | — | ◇ UNVERIFIED |
| CSCgb St Louis Shipyard | Saint Louis, MO | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| CSCgb St. Louis Shipyard-office Barge | Saint Louis, MO | Transportation Equipment Manufacturing336611 | — | ◇ UNVERIFIED |
| CPCg Power Systems | Washington, MO | Electrical Equipment, Appliance & Component Manufacturing335311 | — | ◇ UNVERIFIED |
| CCChauvin Coffee CO - Chauvin Coffee CO | Saint Louis, MO | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| CCChevron Chemical CO - Maryland Heights | Maryland Heights, MO | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| CBChrist Bros Products LLC | Dupo, IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| CBChrist Bros Products LLC | Collinsville, IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| CLChrysler Llc, North Assembly Plant | Fenton, MO | Transportation Equipment Manufacturing336112 | — | ◇ UNVERIFIED |
| CSChrysler St. Louis South Assembly Plant | Fenton, MO | Transportation Equipment Manufacturing336110 | — | ◇ UNVERIFIED |
| CSCircle Smelting CORP | Beckemeyer, IL | Primary Metal Manufacturing331000 | — | ◇ UNVERIFIED |
| CCClean City Squares INC | Saint Louis, MO | Fabricated Metal Product Manufacturing332116 | — | ◇ UNVERIFIED |
