| FIFiberglass Innovations LLC | Rockford, IL | Plastics and Rubber Products Manufacturing326122 | — | ◇ UNVERIFIED |
| FJFlying J Travel Plaza | South Beloit, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| FCForest City Mortuary Svc | Rockford, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| FGForge Group Rockford LLC | Rockford, IL | Fabricated Metal Product Manufacturing332111 | — | ◇ UNVERIFIED |
| FSForging & Stampings, INC. | Rockford, IL | Fabricated Metal Product Manufacturing332111 | — | ◇ UNVERIFIED |
| FAForte Automation Systems, INC. | Rockford, IL | Machinery Manufacturing333244 | — | ◇ UNVERIFIED |
| FPForterra Pipe & Precast, LLC | South Beloit, IL | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| FWFranklin Wire Works | Belvidere, IL | Fabricated Metal Product Manufacturing332618 | — | ◇ UNVERIFIED |
| FFFree Flow Rockford LLC | Machesney Park, IL | Chemical Manufacturing325130 | — | ◇ UNVERIFIED |
| FFFree Flow Technologies LTD | Rockford, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| GTGalactic Tool of Rockford Corporation | Rockford, IL | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| GFGary Ford | Rockford, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| GLGates Lawn & Landscape | Loves Park, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
 General Mills Operations INC | Belvidere, IL | Food Manufacturing311340 | — | ◇ UNVERIFIED |
| GMGfi Metal Treating INC | Rockford, IL | Primary Metal Manufacturing331410 | — | ◇ UNVERIFIED |
| GGGns Gas CO | Rockford, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| GPGoat Precision Machining LLC | Rockford, IL | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| GRGreater Rockford Airport | Rockford, IL | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| GAGrupo Antolin-illinois | Belvidere, IL | Transportation Equipment Manufacturing336399 | — | ◇ UNVERIFIED |
| GGGuerilla Graffix, Inc. | Rockford, IL | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| HSHamilton Sundstrand CORP | Rockford, IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| HAHarrison Ave Mart | Rockford, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| HIHennig, INC. Marlin | Machesney Park, IL | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| HMHeritage Mold, Incorporated | Rockford, IL | Machinery Manufacturing333511 | — | ◇ UNVERIFIED |
| ISImage Signs, INC. | Rockford, IL | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| IPImi Precision Engineering | Machesney Park, IL | Machinery Manufacturing333995 | — | ◇ UNVERIFIED |
| IMIndustrial Molds, Inc. | Rockford, IL | Machinery Manufacturing333511 | — | ◇ UNVERIFIED |
| ICIngersol Cutting Tool CO Member of the Imc Group | Loves Park, IL | Machinery Manufacturing333512 | — | ◇ UNVERIFIED |
| ILIntegrated Label Corporation | Rockford, IL | Paper Manufacturing322299 | — | ◇ UNVERIFIED |
| ICIpsen Ceramics | Pecatonica, IL | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| IRIspen Road Pit | Belvidere, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| JMJava Mania Coffee Roastery INC | Loves Park, IL | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| JDJeremiah Dennison | Rockford, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| JBJjj Brass & Aluminum Foundry, LLC | South Beloit, IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| JSJKD Sugar & Spice, Inc. | Rockford, IL | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| JMJLC Machesney, LLC | Machesney Park, IL | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| JPJ&M Plating, Inc. | Rockford, IL | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| JOJoe Ocello | Capron, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| JBJohn Byrne Jr | Rockford, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| JHJohn & Helen, INC. | Machesney Park, IL | Apparel Manufacturing315991 | — | ◇ UNVERIFIED |
| JNJones Natural Chews Company | Rockford, IL | Food Manufacturing311111 | — | ◇ UNVERIFIED |
| KPKadon Precision Machining, INC. | Rockford, IL | Fabricated Metal Product Manufacturing332721 | — | ◇ UNVERIFIED |
| KPKadon Precision Machining, LLC | Rockford, IL | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| KTKeene Technologies INC | South Beloit, IL | Machinery Manufacturing333243 | — | ◇ UNVERIFIED |
| KSKilburn Shell | Rockford, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| KOKinney Oil INC | Durand, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| KPKinneys Pump House | Durand, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| KLKirkland LLC | Kirkland, IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| KWKrazy Wills | Rockford, IL | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| KPKwik Pantry Dba Capron Marathon | Capron, IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
