| GAGcc Alliance Concrete Inc-sioux Center | Sioux Center | IA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| GGemini | Decorah | IA | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| GIGencor Industries INC | Marquette | IA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| GPGenerac Power Systems, INC | Maquoketa | IA | Electrical Equipment, Appliance & Component Manufacturing335312 | — | ◇ UNVERIFIED |
| GEGeneral Electric - Consumer & Industrial Division | West Burlington | IA | Electrical Equipment, Appliance & Component Manufacturing335313 | — | ◇ UNVERIFIED |
| GEGeneral Electric Railcar Repair Services, LLC | Council Bluffs | IA | Transportation Equipment Manufacturing336510 | — | ◇ UNVERIFIED |
 General Mills Operations, INC. - Cedar Rapids | Cedar Rapids | IA | Food Manufacturing311211 | — | ◇ UNVERIFIED |
| GMGeneral Motors S.c. | Sioux City | IA | Transportation Equipment Manufacturing336311 | — | ◇ UNVERIFIED |
| GCGlen-gery CORP | Redfield | IA | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| GCGmt CORP | Nashua | IA | Fabricated Metal Product Manufacturing332313 | — | ◇ UNVERIFIED |
| GCGmt Corporation | Waverly | IA | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| GMGrain Millers INC | St Ansgar | IA | Food Manufacturing311230 | — | ◇ UNVERIFIED |
| GPGraphic Packaging International LLC | Newton | IA | Paper Manufacturing322212 | — | ◇ UNVERIFIED |
| GPGriffin Pipe Products Company | Council Bluffs | IA | Nonmetallic Mineral Product Manufacturing327310 | — | ◇ UNVERIFIED |
| GAGrimes Asphalt & Paving | Des Moines | IA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| HMHallett Materials | Des Moines | IA | Machinery Manufacturing333120 | — | ◇ UNVERIFIED |
| HHHampton Hydraulics Llc-div of Seabee | Hampton | IA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| HPHarvey Pallets, INC | West Des Moines | IA | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
| HLHawkeye Leisure Trailers, LTD | Humboldt | IA | Machinery Manufacturing333924 | — | ◇ UNVERIFIED |
| HWHawkeye Woodshavings INC | Pleasant Hill | IA | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| HCHawkins Camanche, Ia | Camanche | IA | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| HRHawk-i Ready Mix | Coralville | IA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| HIHayfield Industries | Hayfield | IA | Plastics and Rubber Products Manufacturing326211 | — | ◇ UNVERIFIED |
| HIHbf Investments, LLC | Humboldt (historical) | IA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| HMHeadco Machine Works | Keokuk | IA | Machinery Manufacturing333318 | — | ◇ UNVERIFIED |
| HCHeartland Co-op Evansville | Indianola | IA | Chemical Manufacturing325314 | — | ◇ UNVERIFIED |
| HFHeartland Finishes INC | Des Moines | IA | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| HIHigley Industries | Dubuque | IA | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| HEHillside Estates Care Facility (now Bayer Production Supply) | Williamsburg | IA | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| HIHolcim (us) INC | Des Moines | IA | Machinery Manufacturing333120 | — | ◇ UNVERIFIED |
| HIHolly Industries INC | Hornick | IA | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| HCHome City Ice | Ames | IA | Beverage and Tobacco Product Manufacturing312113 | — | ◇ UNVERIFIED |
| HPHome Plastics INC | Des Moines | IA | Plastics and Rubber Products Manufacturing326112 | — | ◇ UNVERIFIED |
| HPHood Packaging Corporation | Sibley | IA | Paper Manufacturing322220 | — | ◇ UNVERIFIED |
| HTH T C INC | Milford | IA | Machinery Manufacturing333922 | — | ◇ UNVERIFIED |
| HTHull Trailers INC | Braddyville | IA | Transportation Equipment Manufacturing336212 | — | ◇ UNVERIFIED |
| HFHykes Furniture Services | Ankeny | IA | Machinery Manufacturing333210 | — | ◇ UNVERIFIED |
| IIIac Iowa City, LLC | Iowa City | IA | Plastics and Rubber Products Manufacturing326121 | — | ◇ UNVERIFIED |
| IMIce Manufacturing INC | Oelwein | IA | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| IRIdeal Ready Mix CO INC - Burlington | Burlington | IA | Nonmetallic Mineral Product Manufacturing327331 | — | ◇ UNVERIFIED |
| IRIdeal Ready Mix CO INC - Keokuk | Keokuk | IA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| IRIdeal Ready Mix CO INC - Knoxville | Knoxville | IA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| ICIndustrial Container Services LLC | Webster City | IA | Plastics and Rubber Products Manufacturing326121 | — | ◇ UNVERIFIED |
| IFIndustrial Fabrication & Machining INC | Waterloo | IA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| IPIndustrial Plating CO | Ames | IA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| ITIndustrial Tooling & Fabrication | Fort Madison | IA | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| ILInroads, LLC | Des Moines | IA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| ILInroads, LLC | Elkhart | IA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| IIInsta-pro International - Former Site of | Urbandale | IA | Machinery Manufacturing333241 | — | ◇ UNVERIFIED |
| IIInternational Ingredient | Oelwein | IA | Food Manufacturing311000 | — | ◇ UNVERIFIED |
