| FUFort Union Activated Carbon F | Campbell County | WY | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| FUFort Union Activated Carbon Facility | Campbell | WY | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| FRFrank's Refrigeration: Indust | Gillette | WY | Beverage and Tobacco Product Manufacturing312113 | — | ◇ UNVERIFIED |
| FLFrannie Lime Plant | Park | WY | Nonmetallic Mineral Product Manufacturing327410 | — | ◇ UNVERIFIED |
| FTFrosted Tops, LLC | Casper | WY | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| GGencor #1 (ct-16056) | Teton | WY | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| GGencor #2 (ct-14276) | Laramie | WY | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| GEGeneral Electric Company | Gillette | WY | Machinery Manufacturing333319 | — | ◇ UNVERIFIED |
| GNGeorge Nicholson Construction, Inc | Burlington | WY | Electrical Equipment, Appliance & Component Manufacturing335921 | — | ◇ UNVERIFIED |
| GCGillette Concrete Batch Plant | Campbell | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| GHGillette Hot Plant Site | Campbell County | WY | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| GPGillette Plant | Weston County | WY | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| GPGlenrock Portable Concrete Ba | Converse County | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| GGGranger Gas Plant | Sweetwater | WY | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| GCGranite Canyon Quarry | Laramie | WY | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
| HWHahn Welding: Industrial Drain | Gillette | WY | Machinery Manufacturing333992 | — | ◇ UNVERIFIED |
| HAH and H Orin: Injection Wells | Cheyenne | WY | Machinery Manufacturing333298 | — | ◇ UNVERIFIED |
| HCHarnischfeger Corporation: in | Casper | WY | Machinery Manufacturing333131 | — | ◇ UNVERIFIED |
| HPHelium Purification and Liquefaction Facility | Sublette | WY | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| HFHenry Fork Plant Production Facility | Uinta | WY | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| HSHf Sinclair Parco Refining LLC | Carbon | WY | Petroleum and Coal Products Manufacturing324110 | — | ◇ UNVERIFIED |
| HIHme, INC. | Laramie | WY | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| HTHome Technology Solutions | Lovell | WY | Electrical Equipment, Appliance & Component Manufacturing335122 | — | ◇ UNVERIFIED |
| HMHot Mix Asphalt Plant | Johnson County | WY | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| HMHot Mix Asphalt Plant | Buffalo | WY | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| HMHot Mix Asphalt Plant Md-1441 | Platte County | WY | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| HMHot Mix Asphalt Plant Md-1441 (hwy#2) | Platte | WY | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| HDHuish Detergents INC. | Riverton | WY | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| HMHulett Mill | Hulett | WY | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| IYImc-pocatello Yellowstone Rea | Park County | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| IPIndustrial Power Systems, INC | Casper | WY | Transportation Equipment Manufacturing336312 | — | ◇ UNVERIFIED |
| IDInvalid Duplicate Stationary | Laramie | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| IPInvalid Portable Geo-blaster | Sheridan | WY | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| IMIpa Machining LLC | Casper | WY | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| JIJebro INC. | Cheyenne | WY | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| JGJ G Specialty Welding LLC | Gilltte | WY | Fabricated Metal Product Manufacturing332996 | — | ◇ UNVERIFIED |
| JLJonathon Lime Plant & Lime Kiln Dust Landfill | Albany | WY | Nonmetallic Mineral Product Manufacturing327410 | — | ◇ UNVERIFIED |
| JGJtl Group Incorporated | Cheyenne | WY | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| JWJustin W. Rahn | Casper | WY | Machinery Manufacturing333132 | — | ◇ UNVERIFIED |
| KLKdmj, LLC | Gillette | WY | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| KRKnife River Laramie | Laramie | WY | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| KSKomma Slaughter Facility: Ani | Casper | WY | Food Manufacturing311611 | — | ◇ UNVERIFIED |
| LRLampe-fidler Ready Mix: Indus | Thayne | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| LBLaramie Batch Plant | Albany County | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| LCLaramie Chrome Plating: Indus | Laramie | WY | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| LCLaramie Concrete Batch Plant | Albany | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| LPLayos Pit #3 | Sweetwater | WY | Machinery Manufacturing333131 | — | ◇ UNVERIFIED |
| LSLimitless Shops & Land LLC | Gillette | WY | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| LALiquid Asphalt Cement Terminal | Laramie | WY | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| LPLloyd Putnam Ll Enterprises: | Mills | WY | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
