| VPViobin Products LLC | Monticello | Food Manufacturing | 311211 | 20–99 | ◐ LIKELY ACTIVE |
| RARobert Allerton Park | Monticello | Miscellaneous Manufacturing | 339999 | — | ◐ LIKELY ACTIVE |
| CICentral Il Mfg CO | Bement | Transportation Equipment Manufacturing | 336399 | — | ◇ UNVERIFIED |
| ELEzflow LP | Monticello | Plastics and Rubber Products Manufacturing | 326140 | — | ◇ UNVERIFIED |
| GCGeneral Cable | Monticello | Primary Metal Manufacturing | 331420 | — | ◇ UNVERIFIED |
| IIIcd Ironhorse INC | Monticello | Miscellaneous Manufacturing | 339999 | — | ◇ UNVERIFIED |
| WTWillow Tree Missions | Cisco | Miscellaneous Manufacturing | 339999 | — | ◇ UNVERIFIED |
| CICentral Illinois Manufacturing Co, Cim-Tek Filtration | Bement | Transportation Equipment Manufacturing | 336390 | 20–99 | ◐ LIKELY ACTIVE |
| HCHarris Companies, Inc. | Atwood | Machinery Manufacturing | 333921 | 20–99 | ◐ LIKELY ACTIVE |
| OSObrien Scientific Glass Blowing LLC | Monticello | Nonmetallic Mineral Product Manufacturing | 327212 | — | ◐ LIKELY ACTIVE |
| BSBement Stop N Go | Bement | Miscellaneous Manufacturing | 339999 | — | ◇ UNVERIFIED |
| CICentral Illinois Mfg CO | Bement | Machinery Manufacturing | 333998 | — | ◇ UNVERIFIED |
| CAChampaign Asphalt CO LLC | Monticello | Miscellaneous Manufacturing | 339999 | — | ◇ UNVERIFIED |
| CACorrie Art Glass | Monticello | Nonmetallic Mineral Product Manufacturing | 327211 | — | ◇ UNVERIFIED |
| DSDavid Scheurich | Mansfield | Miscellaneous Manufacturing | 339999 | — | ◇ UNVERIFIED |
| IVIllinois Valley Paving CO | Monticello | Nonmetallic Mineral Product Manufacturing | 327320 | — | ◇ UNVERIFIED |
| JRJay Reynolds | Mansfield | Miscellaneous Manufacturing | 339999 | — | ◇ UNVERIFIED |
| MSMark Sheppard | Mansfield | Miscellaneous Manufacturing | 339999 | — | ◇ UNVERIFIED |
| SVSangamon Valley Conservancy | Monticello | Miscellaneous Manufacturing | 339999 | — | ◇ UNVERIFIED |
| SCSoy City Sock Co., INC. | Monticello | Miscellaneous Manufacturing | 339999 | — | ◇ UNVERIFIED |
| SPSuper Pantry 40 | Monticello | Miscellaneous Manufacturing | 339999 | — | ◇ UNVERIFIED |
| VPVcna Prairie Illinois INC | Monticello | Nonmetallic Mineral Product Manufacturing | 327320 | — | ◇ UNVERIFIED |