| MDMidland Divison of American Industries | Jerseyville | Transportation Equipment Manufacturing | 336510 | 20–99 | ◐ LIKELY ACTIVE |
| JCJersey County Grain CO | Jerseyville | Food Manufacturing | 311221 | — | ◐ LIKELY ACTIVE |
| RERed E Mix LLC | Jerseyville | Nonmetallic Mineral Product Manufacturing | 327320 | — | ◇ UNVERIFIED |
| 1W16 West Quick Shop | Jerseyville | Miscellaneous Manufacturing | 339999 | — | ◇ UNVERIFIED |
| ALAdkom, LLC | Jerseyville | Wood Product Manufacturing | 321918 | — | ◇ UNVERIFIED |
| CCCustom Chrome & Polishing | Jerseyville | Miscellaneous Manufacturing | 339999 | — | ◇ UNVERIFIED |
| DMDennis Moore | Fidelity | Miscellaneous Manufacturing | 339999 | — | ◇ UNVERIFIED |
| GRGorman Ready Mix CO INC | Jerseyville | Nonmetallic Mineral Product Manufacturing | 327320 | — | ◇ UNVERIFIED |
| HPHansen Packing Company, Inc. | Jerseyville | Food Manufacturing | 311611 | — | ◇ UNVERIFIED |
| MWManns Welding and Machine LLC | Jerseyville | Fabricated Metal Product Manufacturing | 332119 | — | ◇ UNVERIFIED |
| RIRcs INC | Jerseyville | Miscellaneous Manufacturing | 339999 | — | ◇ UNVERIFIED |