| KAK and P Precast INC | O Fallon | MO | Nonmetallic Mineral Product Manufacturing327331 | 20-99 | ◐ LIKELY ACTIVE |
| PPPermian Plastics, LLC | O Fallon | MO | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
| SRSchreiter Ready Mix and Materials INC | O Fallon | MO | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◐ LIKELY ACTIVE |
| TMTrue Mfg Company INC | O Fallon | MO | Machinery Manufacturing333415 | — | ◐ LIKELY ACTIVE |
| BOBmc O'fallon | O Fallon | MO | Petroleum and Coal Products Manufacturing324121 | — | ◐ LIKELY ACTIVE |
| DIData2 Incorporated | O Fallon | MO | Paper Manufacturing322299 | 20-99 | ◐ LIKELY ACTIVE |
| DPDrug Package | O Fallon | MO | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
| LTLivingston Tool & Mfg. CO. | O Fallon | MO | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| NCNorth Central Stamping, Inc. | O Fallon | MO | Fabricated Metal Product Manufacturing332116 | 20-99 | ◐ LIKELY ACTIVE |
| TPTrinity Products, LLC | O Fallon | MO | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| ASA Square Systems INC | O Fallon | MO | Fabricated Metal Product Manufacturing332813 | — | ◐ LIKELY ACTIVE |
| AAvmat | O Fallon | MO | Fabricated Metal Product Manufacturing332912 | — | ◐ LIKELY ACTIVE |
| IEINC Environmental Recycling | O Fallon | MO | Chemical Manufacturing325314 | — | ◐ LIKELY ACTIVE |
| KRK & R Wood Products | O Fallon | MO | Furniture and Related Product Manufacturing337122 | — | ◐ LIKELY ACTIVE |
| CDClarkWestern Dietrich Building Systems - O'Fallon, MO | O Fallon | MO | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
| CBComponent Bar Products LLC | O Fallon | MO | Fabricated Metal Product Manufacturing332721 | — | ◐ LIKELY ACTIVE |
| HUHolman Upfitting - St. Louis | O Fallon | MO | Transportation Equipment Manufacturing336211 | 1-19 | ◐ LIKELY ACTIVE |
| HCHustler Conveyor Company | O Fallon | MO | Machinery Manufacturing333249 | 20-99 | ◐ LIKELY ACTIVE |
| JTJ&s Tool, INC. | O Fallon | MO | Machinery Manufacturing333515 | — | ◐ LIKELY ACTIVE |
| KKrm | O Fallon | MO | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◐ LIKELY ACTIVE |
| MBMissouri Beer Company, LLC | O'fallon | MO | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| PTPhoenix Textile Corporation | O Fallon | MO | Textile Mills313210 | — | ◐ LIKELY ACTIVE |
Planet Tool & Gear Inc | O Fallon | MO | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| SSShepherd Shield LLC | O Fallon | MO | Printing and Related Support Activities323113 | — | ◐ LIKELY ACTIVE |
| SBShortleaf Brewpub | O'fallon | MO | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| SLSt Louis Syn | O Fallon | MO | Miscellaneous Manufacturing339112 | 100-499 | ◐ LIKELY ACTIVE |
| VAVSM Abrasives | O Fallon | MO | Nonmetallic Mineral Product Manufacturing327910 | 100-499 | ◐ LIKELY ACTIVE |