| RPRainbow Property Investments Corp. | Loves Park, IL | Nonmetallic Mineral Product Manufacturing327110 | — | ◇ UNVERIFIED |
| RNReno Novak | Poplar Grove, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RTRestoration Tools, LLC | Rockford, IL | Fabricated Metal Product Manufacturing332216 | — | ◇ UNVERIFIED |
| RRRoad Ranger 152 | Loves Park, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RRRoad Ranger 155 | Roscoe, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RRRoad Ranger 156 | South Beloit, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RRRoad Ranger 179 | Loves Park, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RRRoad Ranger 202 | Rockford, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RRRoad Ranger 203 | Rockford, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RRRoad Ranger 205 | South Beloit, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RRRoad Ranger 206 | Winnebago, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RRRoad Ranger 207 | Belvidere, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RRRoad Ranger 208 | Rockford, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RRRoad Ranger 211 | Loves Park, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RRRoad Ranger 218 | Rockford, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RRRoad Ranger 231 | Machesney Park, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RERock Energy Cooperative | South Beloit, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RBRockford Brake Manufacturing, INC. | Rockford, IL | Transportation Equipment Manufacturing336340 | — | ◇ UNVERIFIED |
| RCRockford Composting INC | Rockford, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RFRockford Fabricators INC | Belvidere, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RORockford Orthopedic Appliance Co. | Rockford, IL | Miscellaneous Manufacturing339113 | — | ◇ UNVERIFIED |
| RPRockton Phillips 66 257 | Rockton, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RRRogers Ready Mix & Materials | Durand, IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| RRRogers Ready Mix & Materials INC | Roscoe, IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| RPRolando Pinto | Belvidere, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RRRoscoe Ready-mix INC | Belvidere, IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| RRRoscoe Rock and Sand INC | Roscoe, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RRRrv Renovations, LLC | Machesney Park, IL | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| RMRusco Manufacturing INC | Machesney Park, IL | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| RCRust-oleum Corp-rockford | Rockford, IL | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| SPSafeway Products | Rockford, IL | Fabricated Metal Product Manufacturing332431 | — | ◇ UNVERIFIED |
| SPSandy Phillips 66 256 | Rockford, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SCSeal-rite CORP. | Rockford, IL | Fabricated Metal Product Manufacturing332321 | — | ◇ UNVERIFIED |
| SSSecondary Solutions, Inc. | Rockford, IL | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| SSSeward Shortstop | Seward, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
 Siemens Industry INC | Rockford, IL | Machinery Manufacturing333318 | — | ◇ UNVERIFIED |
| SRSigns Rockford LLC | Rockford, IL | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| SASjostrom and Sons INC | South Beloit, IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SSSjostrom & Sons INC | Rockford, IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SSSjostrom & Sons INC | Rockford, IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SOSmith Oil CORP | Rockford, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
 Sonoco Products Company | Rockton, IL | Paper Manufacturing322130 | — | ◇ UNVERIFIED |
| SSSos Soda Blasting, INC. | Rockford, IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| SBSouth Beloit Fire Department | South Beloit, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SMSouth Main Mart | Rockford, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SSpeedway | Belvidere, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SSpeedway #3962 | Roscoe, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SCSpider CO INC | Rockford, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SCSpider Company INC | Machesney Park, IL | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| SFSpx Flow US LLC | Rockford, IL | Machinery Manufacturing333995 | — | ◇ UNVERIFIED |
